php 生成缩略图程序[推荐]

function ResizeImage($im,$maxwidth,$maxheight,$name){
$width = imagesx($im);
$height = imagesy($im);
if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){
if($maxwidth && $width > $maxwidth){
$widthratio = $maxwidth/$width;
$RESIZEWIDTH=true;
}
if($maxheight && $height > $maxheight){
$heightratio = $maxheight/$height;
$RESIZEHEIGHT=true;
}
if($RESIZEWIDTH && $RESIZEHEIGHT){
if($widthratio < $heightratio){
$ratio = $widthratio;
}else{
$ratio = $heightratio;
}
}elseif($RESIZEWIDTH){
$ratio = $widthratio;
}elseif($RESIZEHEIGHT){
$ratio = $heightratio;
}
$newwidth = $width * $ratio;
$newheight = $height * $ratio;
if(function_exists("imagecopyresampled")){
$newim = imagecreatetruecolor($newwidth, $newheight);
imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
}else{
$newim = imagecreate($newwidth, $newheight);
imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
}
ImageJpeg ($newim,$smalladdrname.$name.".jpg");
ImageDestroy ($newim);
}else{
ImageJpeg ($im,$smalladdrname.$name.".jpg");
}
}

if($_FILES['image']['size']){
if($_FILES['image']['type'] == "image/pjpeg"){
$im = imagecreatefromjpeg($bigaddrname.$exname);
}elseif($_FILES['image']['type'] == "image/x-png"){
$im = imagecreatefrompng($bigaddrname.$exname);
}elseif($_FILES['image']['type'] == "image/gif"){
$im = imagecreatefromgif($bigaddrname.$exname);
}
if($im){
if(file_exists($smalladdrname.".jpg")){

unlink($smalladdrname.".jpg");
}
ResizeImage($im,$RESIZEWIDTH,$RESIZEHEIGHT,$smalladdrname);
ImageDestroy ($im);
}

/*
* 功能：PHP图片水印 (水印支持图片或文字)
* 参数：
* $groundImage 背景图片，即需要加水印的图片，暂只支持GIF,JPG,PNG格式；
* $waterPos 水印位置，有10种状态，0为随机位置；
* 1为顶端居左，2为顶端居中，3为顶端居右；
* 4为中部居左，5为中部居中，6为中部居右；
* 7为底端居左，8为底端居中，9为底端居右；
* $waterImage 图片水印，即作为水印的图片，暂只支持GIF,JPG,PNG格式；
* $waterText 文字水印，即把文字作为为水印，支持ASCII码，不支持中文；
* $textFont 文字大小，值为1、2、3、4或5，默认为5；
* $textColor 文字颜色，值为十六进制颜色值，默认为#FF0000(红色)；
*
* 注意：Support GD 2.0，Support FreeType、GIF Read、GIF Create、JPG 、PNG
* $waterImage 和 $waterText 最好不要同时使用，选其中之一即可，优先使用 $waterImage。
* 当$waterImage有效时，参数$waterString、$stringFont、$stringColor均不生效。
* 加水印后的图片的文件名和 $groundImage 一样。
* 作者：longware @ 2004-11-3 14:15:13
*/
function imageWaterMark($groundImage,$waterPos=0,$waterImage=”",$waterText=”",$textFont=5,$textColor=”#FF0000″)
{
$isWaterImage = FALSE;
$formatMsg = “暂不支持该文件格式，请用图片处理软件将图片转换为GIF、JPG、PNG格式。”;

//读取水印文件
if(!emptyempty($waterImage) && file_exists($waterImage))
{
$isWaterImage = TRUE;
$water_info = getimagesize($waterImage);
$water_w = $water_info[0];//取得水印图片的宽
$water_h = $water_info[1];//取得水印图片的高

switch($water_info[2])//取得水印图片的格式
{
case 1:$water_im = imagecreatefromgif($waterImage);break;
case 2:$water_im = imagecreatefromjpeg($waterImage);break;
case 3:$water_im = imagecreatefrompng($waterImage);break;
default:die($formatMsg);
}
}

//读取背景图片
if(!emptyempty($groundImage) && file_exists($groundImage))
{
$ground_info = getimagesize($groundImage);
$ground_w = $ground_info[0];//取得背景图片的宽
$ground_h = $ground_info[1];//取得背景图片的高

switch($ground_info[2])//取得背景图片的格式
{
case 1:$ground_im = imagecreatefromgif($groundImage);break;
case 2:$ground_im = imagecreatefromjpeg($groundImage);break;
case 3:$ground_im = imagecreatefrompng($groundImage);break;
default:die($formatMsg);
}
}
else
{
die(”需要加水印的图片不存在！”);
}

//水印位置
if($isWaterImage)//图片水印
{
$w = $water_w;
$h = $water_h;
$label = “图片的”;
}
else//文字水印
{
$temp = imagettfbbox(ceil($textFont*5),0,”./cour.ttf”,$waterText);//取得使用 TrueType 字体的文本的范围
$w = $temp[2] - $temp[6];
$h = $temp[3] - $temp[7];
unset($temp);
$label = “文字区域”;
}
if( ($ground_w<$w) || ($ground_h<$h) )
{
echo “需要加水印的图片的长度或宽度比水印”.$label.”还小，无法生成水印！”;
return;
}
switch($waterPos)
{
case 0://随机
$posX = rand(0,($ground_w - $w));
$posY = rand(0,($ground_h - $h));
break;
case 1://1为顶端居左
$posX = 0;
$posY = 0;
break;
case 2://2为顶端居中
$posX = ($ground_w - $w) / 2;
$posY = 0;
break;
case 3://3为顶端居右
$posX = $ground_w - $w;
$posY = 0;
break;
case 4://4为中部居左
$posX = 0;
$posY = ($ground_h - $h) / 2;
break;
case 5://5为中部居中
$posX = ($ground_w - $w) / 2;
$posY = ($ground_h - $h) / 2;
break;
case 6://6为中部居右
$posX = $ground_w - $w;
$posY = ($ground_h - $h) / 2;
break;
case 7://7为底端居左
$posX = 0;
$posY = $ground_h - $h;
break;
case 8://8为底端居中
$posX = ($ground_w - $w) / 2;
$posY = $ground_h - $h;
break;
case 9://9为底端居右
$posX = $ground_w - $w;
$posY = $ground_h - $h;
break;
default://随机
$posX = rand(0,($ground_w - $w));
$posY = rand(0,($ground_h - $h));
break;
}

//设定图像的混色模式
imagealphablending($ground_im, true);

if($isWaterImage)//图片水印
{
imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷贝水印到目标文件
}
else//文字水印
{
if( !emptyempty($textColor) && (strlen($textColor)==7) )
{
$R = hexdec(substr($textColor,1,2));
$G = hexdec(substr($textColor,3,2));
$B = hexdec(substr($textColor,5));
}
else
{
die(”水印文字颜色格式不正确！”);
}
imagestring ( $ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));
}

//生成水印后的图片
@unlink($groundImage);
switch($ground_info[2])//取得背景图片的格式
{
case 1:imagegif($ground_im,$groundImage);break;
case 2:imagejpeg($ground_im,$groundImage);break;
case 3:imagepng($ground_im,$groundImage);break;
default:die($errorMsg);
}

//释放内存
if(isset($water_info)) unset($water_info);
if(isset($water_im)) imagedestroy($water_im);
unset($ground_info);
imagedestroy($ground_im);
}
//—————————————————————————————
$id=$_REQUEST['id'];
$num = count($_FILES['userfile']['name']);
print_r($_FILES['userfile']);
print_r($_FILES['userfile']['name']);

echo $num;
echo “<bR>”;
if(isset($id)){
for($i=0;$i<$id;$i++){

if(isset($_FILES) && !emptyempty($_FILES['userfile']) && $_FILES['userfile']['size']>0)
{
$uploadfile = “./”.time().”_”.$_FILES['userfile'][name][$i];
echo “<br>”;
echo $uploadfile;
if (copy($_FILES['userfile']['tmp_name'][$i], $uploadfile))
{
echo “OK<br>”;

//文字水印
//imageWaterMark($uploadfile,5,”",”HTTP://www.lvye.info”,5,”#cccccc“);

//图片水印
$waterImage=”logo_ok1.gif”;//水印图片路径
imageWaterMark($uploadfile,9,$waterImage);

echo “<img src=”".$uploadfile.”” border=”0”>”;
}
else
{
echo “Fail<br>”;
}
}
}
}

?>
<form enctype=”multipart/form-data” method=”POST”>
<?php
for($a=0;$a<$id;$a++){
echo “文件: <input name=”userfile[]” type=”file”><br>”;

}
?>
<input type=”submit” value=”上传”>
</form>
?>

//下面这段代码是一段图片上传并且给上传的图片加水印

参数说明:
$max_file_size  : 上传文件大小限制, 单位BYTE
$destination_folder : 上传文件路径
$watermark   : 是否附加水印(1为加水印,其他为不加水印);
使用说明:
1. 将PHP.INI文件里面的"extension=php_gd2.dll"一行前面的;号去掉,因为我们要用到GD库;
2. 将extension_dir =改为你的php_gd2.dll所在目录;
3. http://www.111cn.net/php.asp;
****************************************************/
//上传文件类型列表
$uptypes=array(
    'image/jpg', 
    'image/jpeg',
    'image/png',
    'image/pjpeg',
    'image/gif',
    'image/bmp',
    'image/x-png'
);
$max_file_size=2000000;     //上传文件大小限制, 单位BYTE
$destination_folder="uploadimg/"; //上传文件路径
$watermark=1;      //是否附加水印(1为加水印,其他为不加水印);
$watertype=1;      //水印类型(1为文字,2为图片)
$waterposition=1;     //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);
$waterstring="http://www.xplore.cn/";  //水印字符串
$waterimg="xplore.gif";    //水印图片
$imgpreview=1;      //是否生成预览图(1为生成,其他为不生成);
$imgpreviewsize=1/2;    //缩略图比例
?>
<html>
<head>
<title>ZwelL图片上传程序</title>
<style type="text/css教程">
<!--
body
{
     font-size: 9pt;
}
input
{
     background-color: #66CCFF;
     border: 1px inset #CCCCCC;
}
-->
</style>
</head>
<body>
<form enctype="multipart/form-data" method="post" name="upform">
  上传文件:
  <input name="upfile" type="file">
  <input type="submit" value="上传"><br>
  允许上传的文件类型为:<?=implode(', ',$uptypes)?>
</form>
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
    if (!is_uploaded_file($_FILES["upfile"][tmp_name]))
    //是否存在文件
    {
         echo "图片不存在www.111cn.net!";
         exit;
    }
    $file = $_FILES["upfile"];
    if($max_file_size < $file["size"])
    //检查文件大小
    {
        echo "文件太大!";
        exit;
    }
    if(!in_array($file["type"], $uptypes))
    //检查文件类型
    {
        echo "文件类型不符!".$file["type"];
        exit;
    }
    if(!file_exists($destination_folder))
    {
        mkdir($destination_folder);
    }
    $filename=$file["tmp_name"];
    $image_size = getimagesize($filename);
    $pinfo=pathinfo($file["name"]);
    $ftype=$pinfo['extension'];
    $destination = $destination_folder.time().".".$ftype;
    if (file_exists($destination) && $overwrite != true)
    {
        echo "同名文件已经存在了";
        exit;
    }
    if(!move_uploaded_file ($filename, $destination))
    {
        echo "移动文件出错";
        exit;
    }
    $pinfo=pathinfo($destination);
    $fname=$pinfo[basename];
    echo " <font color=red>已经成功上传</font><br>文件名:  <font color=blue>".$destination_folder.$fname."</font><br>";
    echo " 宽度:".$image_size[0];
    echo " 长度:".$image_size[1];
    echo "<br> 大小:".$file["size"]." bytes";
    if($watermark==1)
    {
        $iinfo=getimagesize($destination,$iinfo);
        $nimage=imagecreatetruecolor($image_size[0],$image_size[1]);
        $white=imagecolorallocate($nimage,255,255,255);
        $black=imagecolorallocate($nimage,0,0,0);
        $red=imagecolorallocate($nimage,255,0,0);
        imagefill($nimage,0,0,$white);
        switch ($iinfo[2])
        {
            case 1:
            $simage =imagecreatefromgif($destination);
            break;
            case 2:
            $simage =imagecreatefromjpeg($destination);
            break;
            case 3:
            $simage =imagecreatefrompng($destination);
            break;
            case 6:
            $simage =imagecreatefromwbmp($destination);
            break;
            default:
            die("不支持的文件类型");
            exit;
        }
        imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size[1]);
        imagefilledrectangle($nimage,1,$image_size[1]-15,80,$image_size[1],$white);
        switch($watertype)
        {
            case 1:   //加水印字符串
            imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black);
            break;
            case 2:   //加水印图片
            $simage1 =imagecreatefromgif("xplore.gif");
            imagecopy($nimage,$simage1,0,0,0,0,85,15);
            imagedestroy($simage1);
            break;
        }
        switch ($iinfo[2])
        {
            case 1:
            //imagegif($nimage, $destination);
            imagejpeg($nimage, $destination);
            break;
            case 2:
            imagejpeg($nimage, $destination);
            break;
            case 3:
            imagepng($nimage, $destination);
            break;
            case 6:
            imagewbmp($nimage, $destination);
            //imagejpeg($nimage, $destination);
            break;
        }
        //覆盖原上传文件
        imagedestroy($nimage);
        imagedestroy($simage);
    }
    if($imgpreview==1)
    {
    echo "<br>图片预览:<br>";
    echo "<img src="".$destination."" width=".($image_size[0]*$imgpreviewsize)." height=".($image_size[1]*$imgpreviewsize);
    echo " alt="图片预览: 文件名:".$destination." www.111cn.net上传时间:">";
    }
}
?>

$array = array(
    array(1,2),
    array(3,4),
    array('www.111cn.net','111cn.net')
    );
    
//看到上面二维数结构了吧，下面我们用foreach来实例

function array_2to1($array)
{
    static $result_array=array();
    foreach($array as $value)
    {
        if(is_array($value))
        {
            arrau_2to1($value);
        }
        else 
            $result_array[]=$value;
    }
    return $result_array;
}

//上面这段代码还可以简写

function _rebuild_array($arr){  //rebuild a array
  static $tmp=array();

  for($i=0; $i<count($arr); $i++){
    if(is_array($arr[$i])) _rebuild_array($arr[$i]);
    else $tmp[]=$arr[$i];
  }

  return $tmp;
}

$arr = array_2to1( $array );
foreach( $arr as $v )
{
 echo $v;
}

//现在再来看一个反一维数据保存到二维数据的实例

$arr_new=array();
$insert_key  =array('uid','hostname','shopname','province','city','county','address','www.111cn.net','qq','Mobile','msn');

$insert_value=array('2','hostname','shopname','province','city','www.111cn.net','address','shopimg','qq','Mobile','msn');
//一在我们把2个数组一一对应写到一个新的二维数组里去

foreach($insert_key as $key => $val){
$arr_new[$val]=$insert_value[$key];

}
print_r($arr_new);

php教程按指定大小等比缩放生成上传图片缩略图
/**
 * *
 *等比缩放
 * @param unknown_type $srcImage   源图片路径
 * @param unknown_type $toFile     目标图片路径
 * @param unknown_type $maxWidth   最大宽
 * @param unknown_type $maxHeight  最大高
 * @param unknown_type $imgQuality 图片质量
 * @return unknown
 */

function resize($srcImage,$toFile,$maxWidth = 100,$maxHeight = 100,$imgQuality=100)
{
 
    list($width, $height, $type, $attr) = getimagesize($srcImage);
    if($width < $maxWidth  || $height < $maxHeight) return ;
    switch ($type) {
    case 1: $img = imagecreatefromgif($srcImage); break;
    case 2: $img = imagecreatefromjpeg($srcImage); break;
    case 3: $img = imagecreatefrompng($srcImage); break;
    }
    $scale = min($maxWidth/$width, $maxHeight/$height); //求出绽放比例
   
    if($scale < 1) {
    $newWidth = floor($scale*$width);
    $newHeight = floor($scale*$height);
    $newImg = imagecreatetruecolor($newWidth, $newHeight);
    imagecopyresampled($newImg, $img, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
    $newName = "";
    $toFile = preg_replace("/(.gif|.jpg|.jpeg|.png)/i","",$toFile);

    switch($type) {
        case 1: if(imagegif($newImg, "$toFile$newName.gif", $imgQuality))
        return "$newName.gif"; break;
        case 2: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
        return "$newName.jpg"; break;
        case 3: if(imagepng($newImg, "$toFile$newName.png", $imgQuality))
        return "$newName.png"; break;
        default: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
        return "$newName.jpg"; break;
    }
    imagedestroy($newImg);
    }
    imagedestroy($img);
    return false;
}

//英文验证码相对简单，不要作hex处理，直接用色彩值就OK了。如果
session_start();
function rand_create()
{
    //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, 200,200,200); //RGB灰色标识符
    //开始作图    
    imagefill($im,0,0,$gray);
    while(($randval=rand()%100000)<10000);{
        $_SESSION["Auth_code"] = $randval;
        //将四位整数验证码绘入图片 
        imagestring($im, 5, 10, 3, $randval, $black);
    }
    //加入干扰象素   
    for($i=0;$i<200;$i++){
        $randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
        imagesetpixel($im, rand()%70 , rand()%30 , $randcolor);
    }
    //输出验证图片
    ImagePNG($im);
    //销毁图像标识符
    ImageDestroy($im);
}
rand_create();

//调用方法<img src=www.111cn.net.php />

//中文验证码程序如下

Header("Content-type: image/PNG");
$str = "这里设置一中文如果中国WEB第一站www.111cn.net";
$imagesW = 140;
$imagesH = 40;
//
$Auimg = imagecreate($imagesW,$imagesH);
$bgc = ImageColorAllocate($Auimg,255,255,255);
$font = "heiti.ttf";//这里设置字体，你可以随便下载一款字体哦。
$white=imagecolorallocate($Auimg,234,185,95);
imagearc($Auimg, 150, 8, 20, 20, 75, 170, $white);
imagearc($Auimg, 180, 7,50, 30, 75, 175, $white);
imageline($Auimg,20,20,180,30,$white);
imageline($Auimg,20,18,170,50,$white);
imageline($Auimg,25,50,80,50,$white);
$noise_num = 800;
$line_num = 20;
imagecolorallocate($Auimg,0xff,0xff,0xff);
$rectangle_color=imagecolorallocate($Auimg,0xAA,0xAA,0xAA);
$noise_color=imagecolorallocate($Auimg,0x00,0x00,0x00);
$font_color=imagecolorallocate($Auimg,0x00,0x00,0x00);
$line_color=imagecolorallocate($Auimg,0x00,0x00,0x00);
for($i=0;$i<$noise_num;$i++){
 imagesetpixel($Auimg,mt_rand(0,$imagesW),mt_rand(0,$imagesH),$noise_color);
}
for($i=0;$i<$line_num;$i++){
 imageline($Auimg,mt_rand(0,$imagesW),mt_rand(0,$imagesH),mt_rand(0,$imagesW),mt_rand(0,$imagesH),$line_color);
}
$mtRnd=rand(0,strlen($str)-4);
if($mtRnd%2)$mtRnd+=1;
$str = substr($str,$mtRnd,8);
$str = iconv("GB2312","UTF-8",$str);
ImageTTFText($Auimg, 20, 0, 16, 30, $font_color, $font, $str);
ImagePNG($Auimg);
ImageDestroy($Auimg);
/*
 共同点就是验证码都借助于其它容器来保存如session,cookie等，否则就没有验证的意义了
 本文章由www.111cn.net整，转载请注明来源谢谢合作。