<?php 
/** 
* desription 壓縮圖片 
* @param sting $imgsrc 圖片路徑 
* @param string $imgdst 壓縮后保存路徑 
*/
function image_png_size_add($imgsrc,$imgdst){ 
  list($width,$height,$type)=getimagesize($imgsrc); 
  $new_width = ($width>600?600:$width)*0.9; 
  $new_height =($height>600?600:$height)*0.9; 
  switch($type){ 
    case 1: 
      $giftype=check_gifcartoon($imgsrc); 
      if($giftype){ 
        header('Content-Type:image/gif'); 
        $image_wp=imagecreatetruecolor($new_width, $new_height); 
        $image = imagecreatefromgif($imgsrc); 
        imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height); 
        imagejpeg($image_wp, $imgdst,75); 
        imagedestroy($image_wp); 
      } 
      break; 
    case 2: 
      header('Content-Type:image/jpeg'); 
      $image_wp=imagecreatetruecolor($new_width, $new_height); 
      $image = imagecreatefromjpeg($imgsrc); 
      imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height); 
      imagejpeg($image_wp, $imgdst,75); 
      imagedestroy($image_wp); 
      break; 
    case 3: 
      header('Content-Type:image/png'); 
      $image_wp=imagecreatetruecolor($new_width, $new_height); 
      $image = imagecreatefrompng($imgsrc); 
      imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height); 
      imagejpeg($image_wp, $imgdst,75); 
      imagedestroy($image_wp); 
      break; 
  } 
} 
/** 
* desription 判斷是否gif動畫 
* @param sting $image_file圖片路徑 
* @return boolean t 是 f 否 
*/
function check_gifcartoon($image_file){ 
  $fp = fopen($image_file,'rb'); 
  $image_head = fread($fp,1024); 
  fclose($fp); 
  return preg_match("/".chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0'."/",$image_head)?false:true; 
} 
?>

實(shí)例2：

<?php
/*
----------------------------------------------------------------------
函數(shù):調(diào)整圖片尺寸或生成縮略圖
返回:True/False
參數(shù):
  $Image  需要調(diào)整的圖片(含路徑)
  $Dw=450  調(diào)整時(shí)最大寬度;縮略圖時(shí)的絕對寬度
  $Dh=450  調(diào)整時(shí)最大高度;縮略圖時(shí)的絕對高度
  $Type=1  1,調(diào)整尺寸; 2,生成縮略圖
$path='img/';//路徑
$phtypes=array(
  'img/gif',
  'img/jpg',
  'img/jpeg',
  'img/bmp',
  'img/pjpeg',
  'img/x-png'
);
Function Img($Image,$Dw=450,$Dh=450,$Type=1){
  IF(!File_Exists($Image)){
  Return False;
  }
  //如果需要生成縮略圖,則將原圖拷貝一下重新給$Image賦值
  IF($Type!=1){
  Copy($Image,Str_Replace(".","_x.",$Image));
  $Image=Str_Replace(".","_x.",$Image);
  }
  //取得文件的類型,根據(jù)不同的類型建立不同的對象
  $ImgInfo=GetImageSize($Image);
  Switch($ImgInfo[2]){
  Case 1:
  $Img = @ImageCreateFromGIF($Image);
  Break;
  Case 2:
  $Img = @ImageCreateFromJPEG($Image);
  Break;
  Case 3:
  $Img = @ImageCreateFromPNG($Image);
  Break;
  }
  //如果對象沒有創(chuàng)建成功,則說明非圖片文件
  IF(Empty($Img)){
  //如果是生成縮略圖的時(shí)候出錯(cuò),則需要?jiǎng)h掉已經(jīng)復(fù)制的文件
  IF($Type!=1){Unlink($Image);}
  Return False;
  }
  //如果是執(zhí)行調(diào)整尺寸操作則
  IF($Type==1){
  $w=ImagesX($Img);
  $h=ImagesY($Img);
  $width = $w;
  $height = $h;
  IF($width>$Dw){
   $Par=$Dw/$width;
   $width=$Dw;
   $height=$height*$Par;
   IF($height>$Dh){
   $Par=$Dh/$height;
   $height=$Dh;
   $width=$width*$Par;
   }
  }ElseIF($height>$Dh){
   $Par=$Dh/$height;
   $height=$Dh;
   $width=$width*$Par;
   IF($width>$Dw){
   $Par=$Dw/$width;
   $width=$Dw;
   $height=$height*$Par;
   }
  }Else{
   $width=$width;
   $height=$height;
  }
  $nImg = ImageCreateTrueColor($width,$height);   //新建一個(gè)真彩色畫布
  ImageCopyReSampled($nImg,$Img,0,0,0,0,$width,$height,$w,$h);//重采樣拷貝部分圖像并調(diào)整大小
  ImageJpeg ($nImg,$Image);     //以JPEG格式將圖像輸出到瀏覽器或文件
  Return True;
  //如果是執(zhí)行生成縮略圖操作則
  }Else{
  $w=ImagesX($Img);
  $h=ImagesY($Img);
  $width = $w;
  $height = $h;
  $nImg = ImageCreateTrueColor($Dw,$Dh);
  IF($h/$w>$Dh/$Dw){ //高比較大
   $width=$Dw;
   $height=$h*$Dw/$w;
   $IntNH=$height-$Dh;
   ImageCopyReSampled($nImg, $Img, 0, -$IntNH/1.8, 0, 0, $Dw, $height, $w, $h);
  }Else{   //寬比較大
   $height=$Dh;
   $width=$w*$Dh/$h;
   $IntNW=$width-$Dw;
   ImageCopyReSampled($nImg, $Img, -$IntNW/1.8, 0, 0, 0, $width, $Dh, $w, $h);
  }
  ImageJpeg ($nImg,$Image);
  Return True;
  }
}
?>
<html><body>
<form method="post" enctype="multipart/form-data" name="form1">
 <table>
  <tr><td>上傳圖片</td></tr>
  <tr><td><input type="file" name="photo" size="20" /></td></tr>
 <tr><td><input type="submit" value="上傳"/></td></tr>
 </table>
 允許上傳的文件類型為:<?=implode(', ',$phtypes)?></form>
<?php
 if($_SERVER['REQUEST_METHOD']=='POST'){
  if (!is_uploaded_file($_FILES["photo"][tmp_name])){
   echo "圖片不存在";
   exit();
  }
  if(!is_dir('img')){//路徑若不存在則創(chuàng)建
   mkdir('img');
  }
  $upfile=$_FILES["photo"]; 
  $pinfo=pathinfo($upfile["name"]);
  $name=$pinfo['basename'];//文件名
  $tmp_name=$upfile["tmp_name"];
  $file_type=$pinfo['extension'];//獲得文件類型
  $showphpath=$path.$name;
  
  if(in_array($upfile["type"],$phtypes)){
   echo "文件類型不符！";
   exit();
   }
  if(move_uploaded_file($tmp_name,$path.$name)){
  echo "成功！";
 Img($showphpath,100,800,2);
  }
  echo "<img src=\"".$showphpath."\" />";
 }
?>
</body>
</html>

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