PHP生成GIF动态图片验证码

更新时间：2016年11月25日 16:56 点击：1307

ImageCode函数通过GIFEncoder类实现的GIF动画的PHP源代码，有兴趣的朋友可以研究一下。

代码如下

复制代码

<?php
/**
* 调用示例
* */
session_start();
$randCode = '';
$chars = 'abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPRSTUVWXYZ23456789';
for ( $i = 0; $i < 4; $i++ )
{
$randCode .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
}
$_SESSION['code'] = strtoupper($randCode); // 记录session
ImageCode($randCode, 60); // 显示GIF动画

/**
* ImageCode 生成GIF图片验证
* @param $string 字符串
* @param $width 宽度
* @param $height 高度
* */
function ImageCode($string = '', $width = 75, $height = 25)
{
$authstr = $string ? $string : ((time() % 2 == 0) ? mt_rand(1000, 9999) : mt_rand(10000, 99999));

$board_width = $width;
$board_height = $height;
// 生成一个32帧的GIF动画
for($i = 0; $i < 32; $i++)
{
  ob_start();
     $image = imagecreate($board_width, $board_height);
     imagecolorallocate($image, 0,0,0);
     // 设定文字颜色数组
$colorList[] = ImageColorAllocate($image, 15,73,210);
$colorList[] = ImageColorAllocate($image, 0,64,0);
$colorList[] = ImageColorAllocate($image, 0,0,64);
$colorList[] = ImageColorAllocate($image, 0,128,128);
$colorList[] = ImageColorAllocate($image, 27,52,47);
$colorList[] = ImageColorAllocate($image, 51,0,102);
$colorList[] = ImageColorAllocate($image, 0,0,145);
$colorList[] = ImageColorAllocate($image, 0,0,113);
$colorList[] = ImageColorAllocate($image, 0,51,51);
$colorList[] = ImageColorAllocate($image, 158,180,35);
$colorList[] = ImageColorAllocate($image, 59,59,59);
$colorList[] = ImageColorAllocate($image, 0,0,0);
$colorList[] = ImageColorAllocate($image, 1,128,180);
$colorList[] = ImageColorAllocate($image, 0,153,51);
$colorList[] = ImageColorAllocate($image, 60,131,1);
$colorList[] = ImageColorAllocate($image, 0,0,0);
$fontcolor = ImageColorAllocate($image, 0,0,0);
$gray = ImageColorAllocate($image, 245,245,245);

     $color = imagecolorallocate($image, 255,255,255);
     $color2 = imagecolorallocate($image, 255,0,0);

     imagefill($image, 0, 0, $gray);

     $space = 15;  // 字符间距
     if($i > 0)   // 屏蔽第一帧
     {
      for ($k = 0; $k < strlen($authstr); $k++)
      {
    $colorRandom = mt_rand(0,sizeof($colorList)-1);
    $float_top = rand(0,4);
    $float_left = rand(0,3);
    imagestring($image, 6, $space * $k, $top + $float_top, substr($authstr, $k, 1), $colorList[$colorRandom]);
   }
     }

  for ($k = 0; $k < 20; $k++)
  {
   $colorRandom = mt_rand(0,sizeof($colorList)-1);
  imagesetpixel($image, rand()%70 , rand()%15 , $colorList[$colorRandom]);

  }
  // 添加干扰线
  for($k = 0; $k < 3; $k++)
  {
   $colorRandom = mt_rand(0, sizeof($colorList)-1);
   // $todrawline = rand(0,1);
   $todrawline = 1;
   if($todrawline)
   {
    imageline($image, mt_rand(0, $board_width), mt_rand(0,$board_height), mt_rand(0,$board_width), mt_rand(0,$board_height), $colorList[$colorRandom]);
   }
   else
   {
    $w = mt_rand(0,$board_width);
    $h = mt_rand(0,$board_width);
    imagearc($image, $board_width - floor($w / 2) , floor($h / 2), $w, $h, rand(90,180), rand(180,270), $colorList[$colorRandom]);
   }
  }
     imagegif($image);
     imagedestroy($image);
     $imagedata[] = ob_get_contents();
     ob_clean();
     ++$i;
}

$gif = new GIFEncoder($imagedata);
Header ('Content-type:image/gif');
echo $gif->GetAnimation();
}

/**
* GIFEncoder类
* */
Class GIFEncoder
{
var $GIF = "GIF89a"; /* GIF header 6 bytes */
var $VER = "GIFEncoder V2.06"; /* Encoder version */

    var $BUF = Array ( );
    var $LOP = 0;
    var $DIS = 2;
    var $COL = -1;
    var $IMG = -1;

    var $ERR = Array (
        'ERR00' =>"Does not supported function for only one image!",
        'ERR01' =>"Source is not a GIF image!",
        'ERR02' =>"Unintelligible flag ",
        'ERR03' =>"Could not make animation from animated GIF source",
    );

    function GIFEncoder ($GIF_src, $GIF_dly = 100, $GIF_lop = 0, $GIF_dis = 0, $GIF_red = 0, $GIF_grn = 0, $GIF_blu = 0, $GIF_mod = 'bin' )
    {
        if (!is_array($GIF_src) && !is_array($GIF_tim))
        {
            printf ( "%s: %s", $this->VER, $this->ERR['ERR00']);
            exit( 0 );
        }
        $this->LOP = ($GIF_lop > -1) ? $GIF_lop : 0;
        $this->DIS = ($GIF_dis > -1) ? (( $GIF_dis < 3 ) ? $GIF_dis : 3) : 2;
        $this->COL = ($GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1) ? ($GIF_red | ($GIF_grn << 8) | ($GIF_blu << 16)) : -1;

        for ($i = 0, $src_count = count($GIF_src); $i < $src_count; $i++ )
        {
            if (strToLower( $GIF_mod ) == "url")
            {
            $this->BUF[] = fread (fopen($GIF_src [$i], "rb"), filesize ($GIF_src [$i]));
            }
            elseif(strToLower($GIF_mod) == "bin")
            {
                $this->BUF [ ] = $GIF_src [ $i ];
            }
            else
            {
                printf("%s: %s ( %s )!", $this->VER, $this->ERR [ 'ERR02' ], $GIF_mod);
                exit(0);
            }
            if (substr($this->BUF[$i], 0, 6) != "GIF87a" && substr($this->BUF [$i], 0, 6) != "GIF89a")
            {
                printf( "%s: %d %s", $this->VER, $i, $this->ERR ['ERR01']);
                exit(0);
            }
            for ($j = (13 + 3 * (2 << (ord($this->BUF[$i]{10}) & 0x07 ))), $k = TRUE; $k; $j++)
            {
                switch ($this->BUF [$i]{$j})
                {
                    case "!":
                        if ((substr($this->BUF[$i], ($j + 3), 8)) == "NETSCAPE")
                        {
                                printf( "%s: %s ( %s source )!", $this->VER, $this->ERR ['ERR03'], ($i + 1));
                                exit( 0 );
                        }
                        break;
                    case ";":
                        $k = FALSE;
                        break;
                }
            }
        }
        GIFEncoder::GIFAddHeader();
        for($i = 0, $count_buf = count($this->BUF); $i < $count_buf; $i++)
        {
        GIFEncoder::GIFAddFrames($i, $GIF_dly[$i]);
        }
        GIFEncoder::GIFAddFooter();
    }

    function GIFAddHeader ( )
    {
  $cmap = 0;

  if (ord($this->BUF[0]{10}) & 0x80 )
  {
   $cmap = 3 * ( 2 << ( ord ( $this->BUF [ 0 ]{10} ) & 0x07 ));

   $this->GIF .= substr ( $this->BUF [ 0 ], 6, 7);
   $this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap);
   $this->GIF .= "!37713NETSCAPE2.031" . GIFEncoder::GIFWord ( $this->LOP ) . "";
  }
    }

    function GIFAddFrames ( $i, $d )
    {

$Locals_str = 13 + 3 * (2 <<(ord($this->BUF[$i]{10}) & 0x07));

$Locals_end = strlen($this->BUF[$i]) - $Locals_str - 1;
$Locals_tmp = substr ($this->BUF[$i], $Locals_str, $Locals_end);

$Global_len = 2 << (ord( $this->BUF [0]{10} ) & 0x07 );
$Locals_len = 2 << (ord( $this->BUF[$i]{10}) & 0x07);

$Global_rgb = substr($this->BUF[0], 13, 3 * (2 << ( ord ( $this->BUF[0]{10} ) & 0x07)));
$Locals_rgb = substr ( $this->BUF[$i], 13, 3 * (2 << ( ord ( $this->BUF[$i]{10} ) & 0x07)));

$Locals_ext = "!xF9x04" . chr(($this->DIS << 2) + 0) . chr(($d >> 0) & 0xFF) . chr(($d >> 8) & 0xFF) . "x0x0";

        if ( $this->COL > -1 && ord($this->BUF[$i]{10}) & 0x80)
        {
            for($j = 0; $j < (2 << (ord( $this->BUF[$i]{10}) & 0x07)); $j++ )
            {
                if(ord ($Locals_rgb{3 * $j + 0}) == ($this->COL >> 0) & 0xFF && ord ( $Locals_rgb { 3 * $j + 1 } ) == ( $this->COL >> 8 ) & 0xFF && ord ( $Locals_rgb { 3 * $j + 2 } ) == ( $this->COL >> 16 ) & 0xFF )
                {
                    $Locals_ext = "!xF9x04" . chr(($this->DIS << 2) + 1) . chr (( $d >> 0) & 0xFF) . chr (( $d >> 8) & 0xFF) . chr ($j) . "x0";
                    break;
                }
            }
        }
        switch ( $Locals_tmp { 0 } )
        {
            case "!":
                $Locals_img = substr($Locals_tmp, 8, 10);
                $Locals_tmp = substr($Locals_tmp, 18, strlen ($Locals_tmp) - 18);
                break;
            case ",":
                $Locals_img = substr($Locals_tmp, 0, 10);
                $Locals_tmp = substr($Locals_tmp, 10, strlen($Locals_tmp) - 10);
                break;
        }
        if ( ord ( $this->BUF[$i]{10} ) & 0x80 && $this->IMG > -1 )
        {
            if ( $Global_len == $Locals_len )
            {
    if ( GIFEncoder::GIFBlockCompare ( $Global_rgb, $Locals_rgb, $Global_len ) )
    {
     $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );
    }
    else
    {
     $byte = ord ( $Locals_img{9});
     $byte |= 0x80;
     $byte &= 0xF8;
     $byte |= ( ord ( $this->BUF [ 0 ]{10}) & 0x07);
     $Locals_img{9} = chr($byte);
     $this->GIF .= ($Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp);
    }
            }
            else
            {
                $byte = ord($Locals_img{9});
                $byte |= 0x80;
                $byte &= 0xF8;
                $byte |= (ord($this->BUF[$i]{10}) & 0x07);
                $Locals_img {9} = chr($byte);
                $this->GIF .= ($Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp);
            }
        }
        else
        {
            $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );
        }
        $this->IMG = 1;
    }

    function GIFAddFooter ( ) {
        $this->GIF .= ";";
    }

    function GIFBlockCompare ( $GlobalBlock, $LocalBlock, $Len )
    {
        for ( $i = 0; $i < $Len; $i++ )
        {
            if($GlobalBlock { 3 * $i + 0 } != $LocalBlock { 3 * $i + 0 } || $GlobalBlock { 3 * $i + 1 } != $LocalBlock { 3 * $i + 1 } || $GlobalBlock { 3 * $i + 2 } != $LocalBlock{3 * $i + 2})
            {
                return ( 0 );
            }
        }
        return ( 1 );
    }

    function GIFWord ( $int )
    {
       return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) );
    }

    function GetAnimation ( )
    {
        return ($this->GIF);
    }
}

缩略图用得最多的是我们上传图片时生成一张小图，这样就可以很好的解决图片大小或影响网站整体美观的问题了，下面介绍的生成图片缩略图类都不支持图片上传，我们要先上传再调用此类来操作。

//使用如下类就可以生成图片缩略图,

代码如下

复制代码

<?php
class resizeimage
{
    //图片类型
    var $type;
    //实际宽度
    var $width;
    //实际高度
    var $height;
    //改变后的宽度
    var $resize_width;
    //改变后的高度
    var $resize_height;
    //是否裁图
    var $cut;
    //源图象
    var $srcimg;
    //目标图象地址
    var $dstimg;
    //临时创建的图象
    var $im;

    function resizeimage($img, $wid, $hei,$c,$dstpath)
    {
        $this->srcimg = $img;
        $this->resize_width = $wid;
        $this->resize_height = $hei;
        $this->cut = $c;
        //图片的类型

$this->type = strtolower(substr(strrchr($this->srcimg,"."),1));

        //初始化图象
        $this->initi_img();
        //目标图象地址
        $this -> dst_img($dstpath);
        //--
        $this->width = imagesx($this->im);
        $this->height = imagesy($this->im);
        //生成图象
        $this->newimg();
        ImageDestroy ($this->im);
    }
    function newimg()
    {
        //改变后的图象的比例
        $resize_ratio = ($this->resize_width)/($this->resize_height);
        //实际图象的比例
        $ratio = ($this->width)/($this->height);
        if(($this->cut)=="1")
        //裁图
        {
            if($ratio>=$resize_ratio)
            //高度优先
            {
                $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this-

>resize_height, (($this->height)*$resize_ratio), $this->height);
                ImageJpeg ($newimg,$this->dstimg);
            }
            if($ratio<$resize_ratio)
            //宽度优先
            {
                $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this-

>resize_height, $this->width, (($this->width)/$resize_ratio));
                ImageJpeg ($newimg,$this->dstimg);
            }
        }
        else
        //不裁图
        {
            if($ratio>=$resize_ratio)
            {
                $newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this-

>resize_width)/$ratio, $this->width, $this->height);
                ImageJpeg ($newimg,$this->dstimg);
            }
            if($ratio<$resize_ratio)
            {
                $newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio,

$this->resize_height, $this->width, $this->height);
                ImageJpeg ($newimg,$this->dstimg);
            }
        }
    }
    //初始化图象
    function initi_img()
    {
        if($this->type=="jpg")
        {
            $this->im = imagecreatefromjpeg($this->srcimg);
        }
        if($this->type=="gif")
        {
            $this->im = imagecreatefromgif($this->srcimg);
        }
        if($this->type=="png")
        {
            $this->im = imagecreatefrompng($this->srcimg);
        }
    }
    //图象目标地址
    function dst_img($dstpath)
    {
        $full_length = strlen($this->srcimg);

$type_length = strlen($this->type);
$name_length = $full_length-$type_length;

$name = substr($this->srcimg,0,$name_length-1);
$this->dstimg = $dstpath;

//echo $this->dstimg;
}
}
?>

类的调用方法

$resizeimage = new resizeimage("图片源文件地址", "200", "100", "0","缩略图地址");

//就只用上面的一句话,就能生成缩略图,其中,源文件和缩略图地址可以相同,200,100分别代表宽和高

实例2

PHP缩略图等比例无损压缩，可填充空白区域补充色

代码如下

复制代码

<?php
error_reporting( E_ALL );

// 测试
imagezoom('1.jpg', '2.jpg', 400, 300, '#FFFFFF');

/*
    php缩略图函数：
        等比例无损压缩，可填充补充色 author: 华仔
    主持格式：
        bmp 、jpg 、gif、png
    param:
        @srcimage : 要缩小的图片
        @dstimage : 要保存的图片
        @dst_width: 缩小宽
        @dst_height: 缩小高
        @backgroundcolor: 补充色如：#FFFFFF 支持 6位不支持3位
*/
function imagezoom( $srcimage, $dstimage, $dst_width, $dst_height, $backgroundcolor ) {

        // 中文件名乱码
        if ( PHP_OS == 'WINNT' ) {
                $srcimage = iconv('UTF-8', 'GBK', $srcimage);
                $dstimage = iconv('UTF-8', 'GBK', $dstimage);
        }

    $dstimg = imagecreatetruecolor( $dst_width, $dst_height );
    $color = imagecolorallocate($dstimg
        , hexdec(substr($backgroundcolor, 1, 2))
        , hexdec(substr($backgroundcolor, 3, 2))
        , hexdec(substr($backgroundcolor, 5, 2))
    );
    imagefill($dstimg, 0, 0, $color);

    if ( !$arr=getimagesize($srcimage) ) {
                echo "要生成缩略图的文件不存在";
                exit;
        }

    $src_width = $arr[0];
    $src_height = $arr[1];
    $srcimg = null;
    $method = getcreatemethod( $srcimage );
    if ( $method ) {
        eval( '$srcimg = ' . $method . ';' );
    }

    $dst_x = 0;
    $dst_y = 0;
    $dst_w = $dst_width;
    $dst_h = $dst_height;
    if ( ($dst_width / $dst_height - $src_width / $src_height) > 0 ) {
        $dst_w = $src_width * ( $dst_height / $src_height );
        $dst_x = ( $dst_width - $dst_w ) / 2;
    } elseif ( ($dst_width / $dst_height - $src_width / $src_height) < 0 ) {
        $dst_h = $src_height * ( $dst_width / $src_width );
        $dst_y = ( $dst_height - $dst_h ) / 2;
    }

    imagecopyresampled($dstimg, $srcimg, $dst_x
        , $dst_y, 0, 0, $dst_w, $dst_h, $src_width, $src_height);

    // 保存格式
    $arr = array(
        'jpg' => 'imagejpeg'
        , 'jpeg' => 'imagejpeg'
        , 'png' => 'imagepng'
        , 'gif' => 'imagegif'
        , 'bmp' => 'imagebmp'
    );
    $suffix = strtolower( array_pop(explode('.', $dstimage ) ) );
    if (!in_array($suffix, array_keys($arr)) ) {
        echo "保存的文件名错误";
        exit;
    } else {
        eval( $arr[$suffix] . '($dstimg, "'.$dstimage.'");' );
    }

    imagejpeg($dstimg, $dstimage);

    imagedestroy($dstimg);
    imagedestroy($srcimg);

}

function str2hex( $str ) {
        $ret = "";

        for( $i = 0; $i < strlen( $str ) ; $i++ ) {
                $ret .= ord($str[$i]) >= 16 ? strval( dechex( ord($str[$i]) ) )
                        : '0'. strval( dechex( ord($str[$i]) ) );
        }

        return strtoupper( $ret );
}

// BMP 创建函数 php本身无
function imagecreatefrombmp($filename)
{
if (! $f1 = fopen($filename,"rb")) return FALSE;

$FILE = unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread($f1,14));
if ($FILE['file_type'] != 19778) return FALSE;

   $BMP = unpack('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'.
                 '/Vcompression/Vsize_bitmap/Vhoriz_resolution'.
                 '/Vvert_resolution/Vcolors_used/Vcolors_important', fread($f1,40));
   $BMP['colors'] = pow(2,$BMP['bits_per_pixel']);
   if ($BMP['size_bitmap'] == 0) $BMP['size_bitmap'] = $FILE['file_size'] - $FILE['bitmap_offset'];
   $BMP['bytes_per_pixel'] = $BMP['bits_per_pixel']/8;
   $BMP['bytes_per_pixel2'] = ceil($BMP['bytes_per_pixel']);
   $BMP['decal'] = ($BMP['width']*$BMP['bytes_per_pixel']/4);
   $BMP['decal'] -= floor($BMP['width']*$BMP['bytes_per_pixel']/4);
   $BMP['decal'] = 4-(4*$BMP['decal']);
   if ($BMP['decal'] == 4) $BMP['decal'] = 0;

   $PALETTE = array();
   if ($BMP['colors'] < 16777216)
   {
    $PALETTE = unpack('V'.$BMP['colors'], fread($f1,$BMP['colors']*4));
   }

   $IMG = fread($f1,$BMP['size_bitmap']);
   $VIDE = chr(0);

   $res = imagecreatetruecolor($BMP['width'],$BMP['height']);
   $P = 0;
   $Y = $BMP['height']-1;
   while ($Y >= 0)
   {
        $X=0;
        while ($X < $BMP['width'])
        {
         if ($BMP['bits_per_pixel'] == 24)
            $COLOR = unpack("V",substr($IMG,$P,3).$VIDE);
         elseif ($BMP['bits_per_pixel'] == 16)
         {
            $COLOR = unpack("n",substr($IMG,$P,2));
            $COLOR[1] = $PALETTE[$COLOR[1]+1];
         }
         elseif ($BMP['bits_per_pixel'] == 8)
         {
            $COLOR = unpack("n",$VIDE.substr($IMG,$P,1));
            $COLOR[1] = $PALETTE[$COLOR[1]+1];
         }
         elseif ($BMP['bits_per_pixel'] == 4)
         {
            $COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1));
            if (($P*2)%2 == 0) $COLOR[1] = ($COLOR[1] >> 4) ; else $COLOR[1] = ($COLOR[1] & 0x0F);
            $COLOR[1] = $PALETTE[$COLOR[1]+1];
         }
         elseif ($BMP['bits_per_pixel'] == 1)
         {
            $COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1));
            if     (($P*8)%8 == 0) $COLOR[1] = $COLOR[1]        >>7;
            elseif (($P*8)%8 == 1) $COLOR[1] = ($COLOR[1] & 0x40)>>6;
            elseif (($P*8)%8 == 2) $COLOR[1] = ($COLOR[1] & 0x20)>>5;
            elseif (($P*8)%8 == 3) $COLOR[1] = ($COLOR[1] & 0x10)>>4;
            elseif (($P*8)%8 == 4) $COLOR[1] = ($COLOR[1] & 0x8)>>3;
            elseif (($P*8)%8 == 5) $COLOR[1] = ($COLOR[1] & 0x4)>>2;
            elseif (($P*8)%8 == 6) $COLOR[1] = ($COLOR[1] & 0x2)>>1;
            elseif (($P*8)%8 == 7) $COLOR[1] = ($COLOR[1] & 0x1);
            $COLOR[1] = $PALETTE[$COLOR[1]+1];
         }
         else
            return FALSE;
         imagesetpixel($res,$X,$Y,$COLOR[1]);
         $X++;
         $P += $BMP['bytes_per_pixel'];
        }
        $Y--;
        $P+=$BMP['decal'];
   }
   fclose($f1);

return $res;
}
// BMP 保存函数，php本身无
function imagebmp ($im, $fn = false)
{
    if (!$im) return false;

    if ($fn === false) $fn = 'php://output';
    $f = fopen ($fn, "w");
    if (!$f) return false;

    $biWidth = imagesx ($im);
    $biHeight = imagesy ($im);
    $biBPLine = $biWidth * 3;
    $biStride = ($biBPLine + 3) & ~3;
    $biSizeImage = $biStride * $biHeight;
    $bfOffBits = 54;
    $bfSize = $bfOffBits + $biSizeImage;

    fwrite ($f, 'BM', 2);
    fwrite ($f, pack ('VvvV', $bfSize, 0, 0, $bfOffBits));

    fwrite ($f, pack ('VVVvvVVVVVV', 40, $biWidth, $biHeight, 1, 24, 0, $biSizeImage, 0, 0, 0, 0));

    $numpad = $biStride - $biBPLine;
    for ($y = $biHeight - 1; $y >= 0; --$y)
    {
        for ($x = 0; $x < $biWidth; ++$x)
        {
            $col = imagecolorat ($im, $x, $y);
            fwrite ($f, pack ('V', $col), 3);
        }
        for ($i = 0; $i < $numpad; ++$i)
            fwrite ($f, pack ('C', 0));
    }
    fclose ($f);
    return true;
}

总结，第一个类文件不如第二个好，因为第一个生成图之后图片会有点变模糊哦，后面这个生成类是高质量的。

一个PHP智能把图片生成缩略图类,可自动根据你图片的大小生成等比例的图片哦，有需要的朋友可参考参考。

代码如下

复制代码

< ?php

/*************************************** *作者：落梦天蝎（beluckly）
*完成时间：2006-12-18
*类名：CreatMiniature
*功能：生成多种类型的缩略图
*基本参数：$srcFile,$echoType
*方法用到的参数：
                 $toFile,生成的文件
                 $toW,生成的宽
                 $toH,生成的高
                 $bk1,背景颜色参数以255为最高
                 $bk2,背景颜色参数
                 $bk3,背景颜色参数

*例子：

     include("thumb.php");
     $cm=new CreatMiniature();
     $cm->SetVar("1.jpg","file");
     $cm->Distortion("dis_bei.jpg",150,200);
     $cm->Prorate("pro_bei.jpg",150,200);
     $cm->Cut("cut_bei.jpg",150,200);
      $cm->BackFill("fill_bei.jpg",150,200);

***************************************/

class CreatMiniature
{
     //公共变量
     var $srcFile="";        //原图
     var $echoType;            //输出图片类型，link--不保存为文件；file--保存为文件
     var $im="";                //临时变量
     var $srcW="";            //原图宽
     var $srcH="";            //原图高

     //设置变量及初始化
     function SetVar($srcFile,$echoType)
     {
         $this->srcFile=$srcFile;
         $this->echoType=$echoType;

         $info = "";
         $data = GetImageSize($this->srcFile,$info);
         switch ($data[2])          {
          case 1:
            if(!function_exists("imagecreatefromgif")){
             echo "你的GD库不能使用GIF格式的图片，请使用Jpeg或PNG格式！<a href='javascript:go(-1);'>返回</a>";
             exit();
            }
            $this->im = ImageCreateFromGIF($this->srcFile);
            break;
         case 2:
           if(!function_exists("imagecreatefromjpeg")){
            echo "你的GD库不能使用jpeg格式的图片，请使用其它格式的图片！<a href='javascript:go(-1);'>返回</a>";
            exit();
           }
           $this->im = ImageCreateFromJpeg($this->srcFile);
           break;
         case 3:
           $this->im = ImageCreateFromPNG($this->srcFile);
           break;
       }
       $this->srcW=ImageSX($this->im);
       $this->srcH=ImageSY($this->im);
     }

     //生成扭曲型缩图
     function Distortion($toFile,$toW,$toH)
     {
         $cImg=$this->CreatImage($this->im,$toW,$toH,0,0,0,0,$this->srcW,$this->srcH);
         return $this->EchoImage($cImg,$toFile);
         ImageDestroy($cImg);
     }

     //生成按比例缩放的缩图
     function Prorate($toFile,$toW,$toH)
     {
         $toWH=$toW/$toH;
         $srcWH=$this->srcW/$this->srcH;
         if($toWH< =$srcWH)
         {
             $ftoW=$toW;
             $ftoH=$ftoW*($this->srcH/$this->srcW);
         }
      else          {
               $ftoH=$toH;
               $ftoW=$ftoH*($this->srcW/$this->srcH);
         }
         if($this->srcW>$toW||$this->srcH>$toH)
         {
             $cImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH);
             return $this->EchoImage($cImg,$toFile);
             ImageDestroy($cImg);
         }
         else
         {
             $cImg=$this->CreatImage($this->im,$this->srcW,$this->srcH,0,0,0,0,$this->srcW,$this->srcH);
             return $this->EchoImage($cImg,$toFile);
             ImageDestroy($cImg);
         }
     }

     //生成最小裁剪后的缩图
     function Cut($toFile,$toW,$toH)
     {
           $toWH=$toW/$toH;
           $srcWH=$this->srcW/$this->srcH;
           if($toWH< =$srcWH)
           {
                $ctoH=$toH;
                $ctoW=$ctoH*($this->srcW/$this->srcH);
           }
           else
           {
               $ctoW=$toW;
               $ctoH=$ctoW*($this->srcH/$this->srcW);
           }
         $allImg=$this->CreatImage($this->im,$ctoW,$ctoH,0,0,0,0,$this->srcW,$this->srcH);
         $cImg=$this->CreatImage($allImg,$toW,$toH,0,0,($ctoW-$toW)/2,($ctoH-$toH)/2,$toW,$toH);
         return $this->EchoImage($cImg,$toFile);
         ImageDestroy($cImg);
         ImageDestroy($allImg);
     }

     //生成背景填充的缩图
     function BackFill($toFile,$toW,$toH,$bk1=255,$bk2=255,$bk3=255)
     {
         $toWH=$toW/$toH;
         $srcWH=$this->srcW/$this->srcH;
         if($toWH< =$srcWH)
         {
             $ftoW=$toW;
             $ftoH=$ftoW*($this->srcH/$this->srcW);
         }
         else
         {
               $ftoH=$toH;
               $ftoW=$ftoH*($this->srcW/$this->srcH);
         }
         if(function_exists("imagecreatetruecolor"))
         {
             @$cImg=ImageCreateTrueColor($toW,$toH);
             if(!$cImg)
             {
                 $cImg=ImageCreate($toW,$toH);
             }
         }
         else
         {
             $cImg=ImageCreate($toW,$toH);
         }
         $backcolor = imagecolorallocate($cImg, $bk1, $bk2, $bk3);        //填充的背景颜色
         ImageFilledRectangle($cImg,0,0,$toW,$toH,$backcolor);
         if($this->srcW>$toW||$this->srcH>$toH)
         {
             $proImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH);
             /*
              if($ftoW< $toW)
              {
                  ImageCopyMerge($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH,100);
              }
              else if($ftoH<$toH)
              {
                  ImageCopyMerge($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100);
              }
              */
             if($ftoW<$toW)
             {
                  ImageCopy($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH);
             }
             else if($ftoH<$toH)
             {
                  ImageCopy($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH);
             }
             else
             {
                  ImageCopy($cImg,$proImg,0,0,0,0,$ftoW,$ftoH);
             }
         }
         else
         {
              ImageCopyMerge($cImg,$this->im,($toW-$ftoW)/2,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100);
         }
         return $this->EchoImage($cImg,$toFile);
         ImageDestroy($cImg);
     }


     function CreatImage($img,$creatW,$creatH,$dstX,$dstY,$srcX,$srcY,$srcImgW,$srcImgH)
     {
         if(function_exists("imagecreatetruecolor"))
         {
             @$creatImg = ImageCreateTrueColor($creatW,$creatH);              if($creatImg)
                 ImageCopyResampled($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
             else
             {
                 $creatImg=ImageCreate($creatW,$creatH);
                 ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
             }
          }
          else
          {
             $creatImg=ImageCreate($creatW,$creatH);
             ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
          }
          return $creatImg;
     }

     //输出图片，link---只输出，不保存文件。file--保存为文件
     function EchoImage($img,$to_File)
     {
         switch($this->echoType)          {
             case "link":
                 if(function_exists('imagejpeg')) return ImageJpeg($img);
                 else return ImagePNG($img);
                 break;
             case "file":
                 if(function_exists('imagejpeg')) return ImageJpeg($img,$to_File);
                 else return ImagePNG($img,$to_File);
                 break;
         }
     }

}
?>

在php中生成缩略图是程序开发中常用的，下面我找了几个不错的php生成缩略图的实现程序，有需要的朋友可使用，本人亲测绝对好用哦。

创建图像缩略图需要许多时间，此代码将有助于了解缩略图的逻辑。

代码如下

复制代码

/**********************
*@filename - path to the image
*@tmpname - temporary path to thumbnail
*@xmax - max width
*@ymax - max height
*/
function resize_image($filename, $tmpname, $xmax, $ymax)
{
$ext = explode(".", $filename);
$ext = $ext[count($ext)-1];

    if($ext == "jpg" || $ext == "jpeg")
        $im = imagecreatefromjpeg($tmpname);
    elseif($ext == "png")
        $im = imagecreatefrompng($tmpname);
    elseif($ext == "gif")
        $im = imagecreatefromgif($tmpname);

$x = imagesx($im);
$y = imagesy($im);

if($x <= $xmax && $y <= $ymax)
return $im;

    if($x >= $y) {
        $newx = $xmax;
        $newy = $newx * $y / $x;
    }
    else {
        $newy = $ymax;
        $newx = $x / $y * $newy;
    }

    $im2 = imagecreatetruecolor($newx, $newy);
    imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);
    return $im2;
}

例2

代码如下

复制代码

function creat_thumbnail($img,$w,$h,$path)
{
$org_info = getimagesize($img); //获得图像大小且是通过post传递过来的
//var_dump($org_info);
//Array ( [0] => 1024 [1] => 768 [2] => 3 [3] => width="1024" height="768" [bits] => 8 [mime] => image/png )
$orig_x = $org_info[0]; //图像宽度
$orig_y = $org_info[1]; //图像高度
$orig_type = $org_info[2]; //图片类别即后缀 1 = GIF，2 = JPG，3 = PNG，

//是真彩色图像
if (function_exists("imagecreatetruecolor"))
{
switch($orig_type)
{
   //从给定的gif文件名中取得的图像
   case 1 : $thumb_type = ".gif"; $_creatImage = "imagegif"; $_function = "imagecreatefromgif";
   break;
   //从给定的jpeg,jpg文件名中取得的图像
   case 2 : $thumb_type = ".jpg"; $_creatImage = "imagejpeg"; $_function = "imagecreatefromjpeg";
   break;
   //从给定的png文件名中取得的图像
   case 3 : $thumb_type = ".png"; $_creatImage = "imagepng"; $_function = "imagecreatefrompng";
   break;
}
}
//如果从给定的文件名可取得的图像
if(function_exists($_function))
{
$orig_image = $_function($img); //从给定的$img文件名中取得的图像
}
if (($orig_x / $orig_y) >= (4 / 3)) //如果宽/高 >= 4/3
{
$y = round($orig_y / ($orig_x / $w)); //对浮点数进行四舍五入
$x = $w;
}
else //即高/宽 >= 4/3
{
$x = round($orig_x / ($orig_y / $h));
$y = $h;
}
$sm_image = imagecreatetruecolor($x, $y); //创建真彩色图片
//重采样拷贝部分图像并调整大小
Imagecopyresampled($sm_image, $orig_image, 0, 0, 0, 0, $x, $y, $orig_x, $orig_y);
//imageJPEG($sm_image, '', 80); //在浏览器输出图像
$tnpath = $path."/"."s_".date('YmdHis').$thumb_type; //缩略图的路径
$thumbnail = @$_creatImage($sm_image, $tnpath, 80); //生成图片,成功返回true(或1)
imagedestroy ($sm_image); //销毁图像
if($thumbnail==true)
{
return $tnpath;
}
}

生成缩略图是当我们要上传图片时如果图片较大我们需要生成一张指定大小的小图以在列表页面显示，这样可节省资源也是现在常用的做法，下面我来分享一个php生成缩略图类，支持自定义高和宽。还支持按高和宽截图

代码如下

复制代码

class resizeimage
{
    //图片类型
    var $type;
    //实际宽度
    var $width;
    //实际高度
    var $height;
    //改变后的宽度
    var $resize_width;
    //改变后的高度
    var $resize_height;
    //是否裁图
    var $cut;
    //源图象
    var $srcimg;
    //目标图象地址
    var $dstimg;
    //临时创建的图象
    var $im;
    function resizeimage($img, $wid, $hei,$c,$dstpath)
    {
        $this->srcimg = $img;
        $this->resize_width = $wid;
        $this->resize_height = $hei;
        $this->cut = $c;
        //图片的类型

$this->type = strtolower(substr(strrchr($this->srcimg,"."),1));
        //初始化图象
        $this->initi_img();
        //目标图象地址
        $this -> dst_img($dstpath);
        //--
        $this->width = imagesx($this->im);
        $this->height = imagesy($this->im);
        //生成图象
        $this->newimg();
        ImageDestroy ($this->im);
    }
    function newimg()
    {
        //改变后的图象的比例
        $resize_ratio = ($this->resize_width)/($this->resize_height);
        //实际图象的比例
        $ratio = ($this->width)/($this->height);
        if(($this->cut)=="1")
        //裁图
        {
            if($ratio>=$resize_ratio)
            //高度优先
            {
                $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);
                ImageJpeg ($newimg,$this->dstimg);
            }
            if($ratio<$resize_ratio)
            //宽度优先
            {
                $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));
                ImageJpeg ($newimg,$this->dstimg);
            }
        }
        else
        //不裁图
        {
            if($ratio>=$resize_ratio)
            {
                $newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);
                ImageJpeg ($newimg,$this->dstimg);
            }
            if($ratio<$resize_ratio)
            {
                $newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);
                ImageJpeg ($newimg,$this->dstimg);
            }
        }
    }
    //初始化图象
    function initi_img()
    {
        if($this->type=="jpg")
        {
            $this->im = imagecreatefromjpeg($this->srcimg);
        }
        if($this->type=="gif")
        {
            $this->im = imagecreatefromgif($this->srcimg);
        }
        if($this->type=="png")
        {
            $this->im = imagecreatefrompng($this->srcimg);
        }
    }
    //图象目标地址
    function dst_img($dstpath)
    {
        $full_length = strlen($this->srcimg);
        $type_length = strlen($this->type);
        $name_length = $full_length-$type_length;

$name = substr($this->srcimg,0,$name_length-1);
$this->dstimg = $dstpath;

//echo $this->dstimg;
}
}

$resizeimage = new resizeimage("11.jpg", "200", "150", "1","17.jpg");
?>

实例二

代码如下

复制代码

<?php

/**
* 生成缩略图
* @author yangzhiguo0903@163.com
* @param string     源图绝对完整地址{带文件名及后缀名}
* @param string     目标图绝对完整地址{带文件名及后缀名}
* @param int        缩略图宽{0:此时目标高度不能为0，目标宽度为源图宽*(目标高度/源图高)}
* @param int        缩略图高{0:此时目标宽度不能为0，目标高度为源图高*(目标宽度/源图宽)}
* @param int        是否裁切{宽,高必须非0}
* @param int/float 缩放{0:不缩放, 0<this<1:缩放到相应比例(此时宽高限制和裁切均失效)}
* @return boolean
*/
function img2thumb($src_img, $dst_img, $width = 75, $height = 75, $cut = 0, $proportion = 0)
{
    if(!is_file($src_img))
    {
        return false;
    }
    $ot = fileext($dst_img);
    $otfunc = 'image' . ($ot == 'jpg' ? 'jpeg' : $ot);
    $srcinfo = getimagesize($src_img);
    $src_w = $srcinfo[0];
    $src_h = $srcinfo[1];
    $type = strtolower(substr(image_type_to_extension($srcinfo[2]), 1));
    $createfun = 'imagecreatefrom' . ($type == 'jpg' ? 'jpeg' : $type);

    $dst_h = $height;
    $dst_w = $width;
    $x = $y = 0;

    /**
     * 缩略图不超过源图尺寸（前提是宽或高只有一个）
     */
    if(($width> $src_w && $height> $src_h) || ($height> $src_h && $width == 0) || ($width> $src_w && $height == 0))
    {
        $proportion = 1;
    }
    if($width> $src_w)
    {
        $dst_w = $width = $src_w;
    }
    if($height> $src_h)
    {
        $dst_h = $height = $src_h;
    }

    if(!$width && !$height && !$proportion)
    {
        return false;
    }
    if(!$proportion)
    {
        if($cut == 0)
        {
            if($dst_w && $dst_h)
            {
                if($dst_w/$src_w> $dst_h/$src_h)
                {
                    $dst_w = $src_w * ($dst_h / $src_h);
                    $x = 0 - ($dst_w - $width) / 2;
                }
                else
                {
                    $dst_h = $src_h * ($dst_w / $src_w);
                    $y = 0 - ($dst_h - $height) / 2;
                }
            }
            else if($dst_w xor $dst_h)
            {
                if($dst_w && !$dst_h) //有宽无高
                {
                    $propor = $dst_w / $src_w;
                    $height = $dst_h = $src_h * $propor;
                }
                else if(!$dst_w && $dst_h) //有高无宽
                {
                    $propor = $dst_h / $src_h;
                    $width = $dst_w = $src_w * $propor;
                }
            }
        }
        else
        {
            if(!$dst_h) //裁剪时无高
            {
                $height = $dst_h = $dst_w;
            }
            if(!$dst_w) //裁剪时无宽
            {
                $width = $dst_w = $dst_h;
            }
            $propor = min(max($dst_w / $src_w, $dst_h / $src_h), 1);
            $dst_w = (int)round($src_w * $propor);
            $dst_h = (int)round($src_h * $propor);
            $x = ($width - $dst_w) / 2;
            $y = ($height - $dst_h) / 2;
        }
    }
    else
    {
        $proportion = min($proportion, 1);
        $height = $dst_h = $src_h * $proportion;
        $width = $dst_w = $src_w * $proportion;
    }

    $src = $createfun($src_img);
    $dst = imagecreatetruecolor($width ? $width : $dst_w, $height ? $height : $dst_h);
    $white = imagecolorallocate($dst, 255, 255, 255);
    imagefill($dst, 0, 0, $white);

    if(function_exists('imagecopyresampled'))
    {
        imagecopyresampled($dst, $src, $x, $y, 0, 0, $dst_w, $dst_h, $src_w, $src_h);
    }
    else
    {
        imagecopyresized($dst, $src, $x, $y, 0, 0, $dst_w, $dst_h, $src_w, $src_h);
    }
    $otfunc($dst, $dst_img);
    imagedestroy($dst);
    imagedestroy($src);
    return true;
}

使用方法

代码如下	复制代码
$src_img = "./ROSI_050_002.JPG"; $dst_img = "./ROSI_050_002_thumb.jpg"; $stat = img2thumb($src_img, $dst_img, $width = 200, $height = 300, $cut = 0, $proportion = 0); if($stat){ echo 'Resize Image Success!<br />'; echo '<img src="'.$dst_img.'" />'; }else{ echo 'Resize Image Fail!'; }

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