加入干扰的生成验证码代码

本款php生成验证码代码原理生成随机数-->创建图片-->随机数写进图片-->保存在session中 ，看一下流程验证码图片生成 通知浏览器将要输出PNG图片 准备好随机数发生器种子 srand((double)microtime()*1000000); 将四位整数验证码绘入图片

代码如下

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/*===================== 产生随机字符串函数 =====================*/ function random($length) {  $hash = '';  $chars = 'abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz';  $max = strlen($chars) - 1;  mt_srand((double)microtime() * 1000000);  for($i = 0; $i < $length; $i++) {   $hash .= $chars[mt_rand(0, $max)];  }  return $hash; } //验证码图片生成  session_start();     //通知浏览器将要输出png图片     header("content-type: image/png");     //准备好随机数发生器种子      //srand((double)microtime()*1000000);     //准备图片的相关参数       $im = imagecreate(62,22);     $black = imagecolorallocate($im, 0,0,0);  //rgb黑色标识符     $white = imagecolorallocate($im, 255,255,255); //rgb白色标识符     $gray = imagecolorallocate($im, 179,183,185); //rgb灰色标识符     //开始作图         imagefill($im,0,0,$gray);     //while(($randval=rand()%100000)<10000);{         //$_session["check_code"] = $randval;         //将四位整数验证码绘入图片   $randval=random(4);   $_session["check_code"]=$randval;         imagestring($im, 5, 10, 3, $randval, $white);     //}     //加入干扰象素        for($i=0;$i<150;$i++){         $randcolor = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));         imagesetpixel($im, rand()%70 , rand()%30 , $white);     }     //输出验证图片     imagepng($im);     //销毁图像标识符     imagedestroy($im); ?>

本文章免费提供一款php图片处理类：缩略，裁剪，圆角，倾斜代码，他可以切出不同风格的图片哦，哈哈，比其它的在线切图要好很多了哦。

代码如下

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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;    //圆角源    var $corner;    var $im; function resizeimage($img, $corner, $wid, $hei,$c, $corner_radius, $angle)    {        $this->srcimg = $img;            $this->corner = $corner;        $this->resize_width = $wid;        $this->resize_height = $hei;        $this->cut = $c;            $this->corner_radius = $corner_radius;            $this->angle = $angle;        //图片的类型        $this->type = substr(strrchr($this->srcimg,"."),1);        //初始化图象        $this->initi_img();        //目标图象地址        $this -> dst_img();        //--        $this->width = imagesx($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);                            $tmp = $this->rounded_corner($newimg,$this->resize_width);                imagepng ($tmp,$this->dstimg);            }            if($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));                            $tmp = $this->rounded_corner($newimg);                imagepng ($tmp,$this->dstimg);            }        }        else

 

 

本款是一款php 读取目录下图像文件哦，代码，他利用了opendir来打开目录然后获取文件后缀名，判断是否为指定文件。

代码如下

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$directory = 'gallery'; $allowed_types=array('jpg','jpeg','gif','png'); $file_parts=array(); $ext=''; $title=''; $i=0; $dir_handle = @opendir($directory) or die("there is an error with your image directory!"); while ($file = readdir($dir_handle)) {  if($file=='.' || $file == '..') continue;    $file_parts = explode('.',$file);  $ext = strtolower(array_pop($file_parts));  $title = implode('.',$file_parts);  $title = htmlspecialchars($title);    $nomargin='';    if(in_array($ext,$allowed_types))  {   if(($i+1)%4==0) $nomargin='nomargin';     echo '   <div class="pic '.$nomargin.'" style="background:url('.$directory.'/'.$file.') no-repeat 50% 50%;">   <a href="'.$directory.'/'.$file.'" title="'.$title.'" target="_blank">'.$title.'</a>   </div>';      $i++;  } } closedir($dir_handle);

这是一款图象缩略函数哦，把上传的新图片给$srcfile然后进行文件按$thumbwidth 缩小图宽最大尺寸 与$thumbheitht 缩小图高最大尺寸 生成小图。

图象缩略函数
参数说明：

代码如下

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$srcfile 原图地址； $dir  新图目录 $thumbwidth 缩小图宽最大尺寸 $thumbheitht 缩小图高最大尺寸 $ratio 默认等比例缩放 为1是缩小到固定尺寸。 */ function makethumb($srcfile,$dir,$thumbwidth,$thumbheight,$ratio=0) {  //判断文件是否存在 if (!file_exists($srcfile))return false;  //生成新的同名文件，但目录不同 $imgname=explode('/',$srcfile); $arrcount=count($imgname); $dstfile = $dir.$imgname[$arrcount-1]; //缩略图大小 $tow = $thumbwidth; $toh = $thumbheight; if($tow < 40) $tow = 40; if($toh < 45) $toh = 45;     //获取图片信息     $im ='';     if($data = getimagesize($srcfile)) {         if($data[2] == 1) {             $make_max = 0;//gif不处理             if(function_exists("imagecreatefromgif")) {                 $im = imagecreatefromgif($srcfile);             }         } elseif($data[2] == 2) {             if(function_exists("imagecreatefromjpeg")) {                 $im = imagecreatefromjpeg($srcfile);             }         } elseif($data[2] == 3) {             if(function_exists("imagecreatefrompng")) {                 $im = imagecreatefrompng($srcfile);             }         }     }     if(!$im) return '';     $srcw = imagesx($im);     $srch = imagesy($im);     $towh = $tow/$toh;     $srcwh = $srcw/$srch;     if($towh <= $srcwh){         $ftow = $tow;         $ftoh = $ftow*($srch/$srcw);     } else {         $ftoh = $toh;         $ftow = $ftoh*($srcw/$srch);     }     if($ratio){         $ftow = $tow;         $ftoh = $toh;     }     //缩小图片     if($srcw > $tow || $srch > $toh || $ratio) {         if(function_exists("imagecreatetruecolor") && function_exists("imagecopyresampled") && @$ni = imagecreatetruecolor($ftow, $ftoh)) {             imagecopyresampled($ni, $im, 0, 0, 0, 0, $ftow, $ftoh, $srcw, $srch);         } elseif(function_exists("imagecreate") && function_exists("imagecopyresized") && @$ni = imagecreate($ftow, $ftoh)) {             imagecopyresized($ni, $im, 0, 0, 0, 0, $ftow, $ftoh, $srcw, $srch);         } else {             return '';         }         if(function_exists('imagejpeg')) {             imagejpeg($ni, $dstfile);         } elseif(function_exists('imagepng')) {             imagepng($ni, $dstfile);         }     }else {         //小于尺寸直接复制     copy($srcfile,$dstfile);     }     imagedestroy($im);     if(!file_exists($dstfile)) {         return '';     } else {         return $dstfile;     } }

?>

这是一款办外开的经典的php生成缩略图类函数，文件灵活实用，可以生成任何风格的图片，并且 可以把文本转换成图形。

copyright   : smart-info limited. all right reserved.
 author      : jacky cheung
 version     : 1.1
 create date : 24 september 2008
 last modify : 15 march 2009
*/

class gd
{
 var $font_face   = "";
 var $text   = "";
 var $size    = 12;
 var $color   = "#000000";
 var $angle   = 0;

 var $width   = 0;
 var $height   = 0;
 var $line_height = 0;
 
 var $type   = "png";
 var $chmod   = 0777;
 var $bg_color  = "#ffffff";
 var $quality  = 95;
 var $antialias  = true;
 
 var $x    = 0;
 var $y    = 0;
 

 /*___| convert text to image |___*/
  public function text2image ( $font_face="", $text="", $attributes=false, $width=0, $all=false )
  {
   $this->font_face  = $font_face;
   $this->text   = $text;
   $this->width  = $width;
   $this->size   = 12;
   $this->color  = "#000000";
   $this->angle  = 0;
   $this->line_height = 0;
   $this->setprop ( $attributes );
   
   if ( $this->width == 0 )
   {
    return $this->convert_text2image ( $this->text, $this->check_text_width( $this->text ) );
   } else {
    // word wrap
    if ( $all === false )
    {
     $text = split(" ", $this->text);
     $text = $this->word_wrap($this->text, $this->width, "<br>");
     $text = split("<br>", $text );
    } else if ( $all === true ) {
     $temp = array();
     for ( $i=0; $i<strlen($this->text); $i++ )
     {
      array_push ( $temp, mb_substr($this->text, $i, 1, "utf-8") );
     }
     $text = array();
     $count_width = 0;
     $i = 0;
     foreach ( $temp as $k => $t )
     {
      $prop = $this->check_text_width($t);
      if ( $count_width + floatval($prop["width"]) < $this->width )
      {
       $text[$i] = $text[$i] . $t;
       $count_width += floatval($prop["width"]);
      } else {
       $count_width = 0;
       $i++;
       $text[$i] = "";
      }
     }
    }
    
    $img = array();
    foreach ( $text as $k => $t )
    {
     $img[$k] = $this->convert_text2image ( $t,  $this->check_text_width( $t ) );
    }
    
    $w = 0;
    $h = 0;
    foreach ( $img as $k => $v )
    {
     $w = (imagesx($img[$k]) > $w) ? imagesx($img[$k]) : $w;

     if ($this->line_height == 0 ) $h += imagesy($img[$k]);
     else $h += ($k < count($img)-1) ? $this->line_height : imagesy($img[$k]);
    }
    
    $base_img = $this->createtransparent($w, $h);
    $locy = 0;
    foreach ( $img as $k => $v )
    {
     if ($k > 0)
     {
      $locy = ($this->line_height == 0) ? $locy + imagesy($img[$k]) : $locy + $this->line_height;
     }
     $base_img = $this->attachgdimage ( $img[$k], $base_img, array ("x"=>0, "y"=>$locy) );
    }
    return $base_img;
   }
  }
  private function word_wrap( $str, $width, $break )
  {
   $formatted = '';
   $position = -1;
   $prev_position = 0;
   $last_line = -1;
   
   /// looping the string stop at each space
   while( $position = mb_stripos( $str, " ", ++$position, 'utf-8' ) ) {
    if( $position > $last_line + $width + 1 ) {
     $formatted.= mb_substr( $str, $last_line + 1, $prev_position - $last_line - 1, 'utf-8' ).$break;
     $last_line = $prev_position;
    }
    $prev_position = $position;
   }
   
   /// adding last line without the break
   $formatted.= mb_substr( $str, $last_line + 1, mb_strlen( $str ), 'utf-8' );
   return $formatted;
  }

  public function convert_text2image ( $text, $prop )
  {
   $im   = imagecreatetruecolor ( $prop["width"], $prop["height"] );
   $rgb   = $this->getrgb ( $this->color );
   $color   = imagecolorallocate ( $im, $rgb["red"], $rgb["green"], $rgb["blue"] );
   $img   = $this->createtransparent ( $prop["width"], $prop["height"] );
   imagettftext ( $img, $this->size, $this->angle, 0, $prop["height"] - abs ( $prop["top"] ), $color, $this->font_face, $text );
   return $img;
  }
  public function check_text_width ( $text )
  {
   $prop = array();
   $bbox    = imagettfbbox ( $this->size, $this->angle, $this->font_face, $text );
   $prop["left"]  = $bbox[0];
   $prop["right"]  = $bbox[2];
   $prop["top"] = $bbox[1];
   $prop["bottom"] = $bbox[7];
   $padding  = 2;
  
   $prop["width"]  = abs($prop["left"]) + abs($prop["right"])  + $padding;
   $prop["height"] = abs($prop["top"])  + abs($prop["bottom"]) + $padding;
   
   return $prop;
  }

 /*___| save to image file |___*/
  public function save($gdimage, $filename, $attributes=false)
  {
   $this->type   = "png";
   $this->chmod   = 0777;
   $this->bg_color  = "#ffffff";
   $this->quality  = 95;
   $this->antialias = true;
   
   $this->setprop ( $attributes );
   
   // process
   switch ( strtolower ( $this->type ) )
   {
    case "jpeg":
    case "jpg":
     $gdimage = $this->createbackground($gdimage, imagesx($gdimage), imagesy($gdimage));
     imagejpeg ( $gdimage, $filename, $this->quality );
     break;
    case "gif":
     $gdimage = $this->createbackground($gdimage, imagesx($gdimage), imagesy($gdimage));
     imagegif ( $gdimage, $filename );
     break;   
    case "png":
    default :
     imagepng ( $gdimage, $filename );
     break;
   }
   chmod ( $filename, $this->chmod );
  }

 /*___| create gd background image |___*/
  public function createbackground($gdimage, $width, $height)
  {
   $img = imagecreatetruecolor ( $width, $height );
   $rgb = $this->getrgb ( $this->bg_color );
   $color = imagecolorallocate ( $img, $rgb["red"], $rgb["green"], $rgb["blue"] );
   imagefill ( $img, 0, 0, $color );
   imagecopyresampled ( $img, $gdimage, 0, 0, 0, 0, $width, $height, $width, $height );
   return $img;
  }

 /*___| create gd transparent image |___*/
  public function createtransparent($width, $height)
  {
   $img = imagecreatetruecolor($width, $height);
   imagealphablending($img, false);
   imagesavealpha($img, true);
   $transparent = imagecolorallocatealpha($img, 0, 0, 0, 127);
   imagefilledrectangle($img, 0, 0, $width, $height, $transparent);
   imagecopyresampled($img, $img, 0, 0, 0, 0, $width, $height, $width, $height);
   return $img;
  }

 
 /*___| load image |___*/
  public function createimagefrom($filename, $alpha=true)
  {
   if ( function_exists ( "exif_imagetype" ) )
   {
    if ( exif_imagetype ( $filename )   == imagetype_jpeg ) { return $this->createfromjpeg ( $filename ); }
    else if ( exif_imagetype ( $filename )  == imagetype_gif  ) { return $this->createfromgif  ( $filename ); }
    else if ( exif_imagetype ( $filename )  == imagetype_png  ) { return $this->createfrompng  ( $filename, $alpha ); }
   }
   else
   {
    if ( strstr ( strtoupper ( $filename )  , ".jpg" )  || strstr ( strtoupper ( $filename ), ".jpeg" )) { return $this->createfromjpeg ( $filename ); }
    else if ( strstr ( strtoupper ( $filename ) , ".gif" )) { return $this->createfromgif ( $filename ); }
    else if ( strstr ( strtoupper ( $filename ) , ".png" )) { return $this->createfrompng ( $filename, $alpha ); }
   }
   return false;
  }
  private function createfromjpeg ( $filename ) { return imagecreatefromjpeg ( $filename ); }
  private function createfromgif  ( $filename ) { return imagecreatefromgif  ( $filename ); }
  private function createfrompng  ( $filename, $alpha=true )
  {
   if ( $alpha )
   {
    list ( $width, $height ) = getimagesize ( $filename );
    $png_img = imagecreatefrompng ( $filename );
    $img = imagecreatetruecolor ( $width, $height );
    imagealphablending ( $img, false );
    imagesavealpha ( $img, true );
    imagecopyresampled ( $img, $png_img, 0, 0, 0, 0, $width, $height, $width, $height );
   } else {
    $img = imagecreatefrompng ( $filename );
   } 
   return $img;
  }
 
 
 /*___| attach background image |___*/
  public function attachbackgroundimage ( $gdimage, $filename, $attributes=false )
  {
   $this->x = 0;
   $this->y = 0;
   $this->setprop ( $attributes );
  
   $img = $this->createimagefrom ( $filename );
   imagecopyresampled ( $img, $gdimage, $this->x, $this->y, 0, 0, imagesx($gdimage), imagesy($gdimage), imagesx($gdimage), imagesy($gdimage) );
   return $img;
  }

 /*___| attach image |___*/
  public function attachimage ( $source, $target, $filename, $image_attributes=false, $attributes=false )
  {
   $source_img = $this->createimagefrom ( $source );
   $target_img = $this->attachbackgroundimage ( $source_img, $target, $attributes );
   $this->save ( $target_img, $filename, $image_attributes );
  }
  
 
 /*___| attach gd image resource |___*/
  public function attachgdimage ( $gd_source, $gd_target, $attributes=false )
  {
   $this->x  = 0;
   $this->y  = 0;
   $this->width = 0;
   $this->height = 0;
   $this->setprop ( $attributes );
   
   imagealphablending($gd_target, true );
   imagealphablending($gd_source, true );
   imagecopy ( $gd_target, $gd_source, $this->x, $this->y, 0, 0, imagesx($gd_source), imagesy($gd_source) );
   return $gd_target;
  }
 
 
 /*___| get rgb color |___*/
  public function getrgb($hex)
  {
   $rgb["red"]   = hexdec ( substr ( $hex, 1, 2 ) ) ;
   $rgb["green"] = hexdec ( substr ( $hex, 3, 2 ) ) ;
   $rgb["blue"]  = hexdec ( substr ( $hex, 5, 2 ) ) ;
   return $rgb;
  }
 
 
 /*___| set properties |___*/ 
  private function setprop ( $attributes=false )
  {
   if ( $attributes ) { foreach  ( $attributes as $key => $value ) { $k = strtoupper ( $key ); $this->$k = $value; } }
  }
}

//调用 方法

代码如下	复制代码
$imgresize = new imagetransform(); $imgresize->sourcefile = $source.$file; $imgresize->targetfile = $destination.$file; $imgresize->chmodvalue = 0777;  $imgresize->resizetowidth = $tw; $imgresize->resizetoheight = $th; $imgresize->jpegoutputquality = 100; $imgresize->resizeifsmaller = false; $imgresize->resize();

?>