/**
* desription 图片压缩
* @param sting $imgsrc 图片路径
* @param int $Dw 设置最大宽度
* @param int $Dh 设置最大高度
*/
function image_png_size_add($imgsrc,$Dw=800,$Dh=800){
//要输入到的路径
$imgdst = $imgsrc;
list($width,$height,$type)=getimagesize($imgsrc);
if ($width > $Dw) {
$Par = $Dw / $width;
$new_width = $Dw;
$new_height = $height * $Par;
if ($new_height > $Dh) {
$Par = $Dh / $new_height;
$new_height = $Dh;
$new_width = $new_width * $Par;
}
} elseif ($height > $Dh) {
$Par = $Dh / $height;
$new_height = $Dh;
$new_width = $width * $Par;
if ($new_width > $Dw) {
$Par = $Dw / $new_width;
$new_width = $Dw;
$new_height = $new_height * $Par;
}
} else {
}
switch($type){
case 1:
$giftype=self::check_gifcartoon($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 判断是否gif动画
* @param sting $image_file图片路径
* @return boolean t 是 f 否
*/
function check_gifcartoon($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;
}