php實作圖片壓縮的二個例子

/**
* desription 壓縮圖片
* @param sting $imgsrc 圖片路徑
* @param string $imgdst 壓縮後儲存路徑
*/
function image_png_size_add($imgsrc,$imgdst){  $new_width = ($width>600?600:$width)*0.9;
 $new_height =($height>600?600:$height)*0.9;
 switch($type){
 情況 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);
 }
 休息；
 情況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);
 休息；
 情況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);
 休息；
 } // bbs.it-home.org
}
/**
* 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){
 $fp = fopenp = fopen ($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;
}
?>

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