php图片等比压缩代码，支持jpg,png,gif，验证gif动画

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<?php
/**
* Created by PhpStorm.
* User: as
* Date: 2016-12-01
* Time: 8:38
*/
//图片压缩
function ImageCondens($filepase){
list($new_width,$new_height,$imgtype)=getimagesize($filepase);
if($new_width>550){//550为自定义宽度
$scaling=$new_width/550;//缩放比例
$picwidth=($new_width/$scaling);
$picheight=($new_height/$scaling);
}else{
$picwidth=$new_width;
$picheight=$new_height;
}
switch ($imgtype){
case 1:
$fp=fopen($filepase,'rb');
$image_head = fread($fp,1024);
fclose($fp);
if(preg_match("/".chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0'."/",$image_head)){//屏蔽gif动画
echo "<script>alert('系统不支持GIF动画图片');</script>";
}else{
if($image_head){
header('Content-Type:image/gif');
$img_wp=imagecreatetruecolor($picwidth,$picheight);
$img=imagecreatefromgif($filepase);
imagecopyresampled($img_wp,$img,0,0,0,0,$picwidth,$picheight,$new_width,$new_height);
imagejpeg($img_wp,null,100);
imagedestroy($img_wp);
}
}
break;
case 2:
header('Content-Type:image/jpeg');
$img_wp=imagecreatetruecolor($picwidth,$picheight);
$img = imagecreatefromjpeg($filepase);
imagecopyresampled($img_wp,$img,0,0,0,0,$picwidth,$picheight,$new_width,$new_height);
imagejpeg($img_wp,null,100);
imagedestroy($img_wp);
break;
case 3:
header('Content-Type:image/png');
$img_wp=imagecreatetruecolor($picwidth,$picheight);
$img = imagecreatefrompng($filepase);
imagecopyresampled($img_wp,$img,0,0,0,0,$picwidth,$picheight,$new_width,$new_height);
imagejpeg($img_wp,null,100);
imagedestroy($img_wp);
break;
}
}
ImageCondens("images/3.jpg");

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