php图片压缩代码
/*
* title ：resizeThumbnailImage 压缩图片
* param ：$thumb 压缩后的路径 绝对
* param ：$image 压缩前的路径 绝对
* param ：$scale 压缩比率 0.5 = 50%
* param ：$fixed array('width'=>64, 'height'=>64); 压缩后的宽高
* return：string 压缩后的路径
*/
function resizeThumbnailImage($thumb,$image,$scale,$fixed=array()){
list($imagewidth, $imageheight, $imageType) = getimagesize($image);
$imageType = image_type_to_mime_type($imageType);
if(isset($fixed['width']) && isset($fixed['height'])){
$newImageWidth = $imagewidth < $fixed['width'] ? $imagewidth : $fixed['width'];
$newImageHeight = $imageheight < $fixed['height'] ? $imageheight : $fixed['height'];
}else{
$newImageWidth = ceil($imagewidth * $scale);
$newImageHeight = ceil($imageheight * $scale);
}
$newImage = imagecreatetruecolor($newImageWidth,$newImageHeight);
switch($imageType) {
case "image/gif":
$source=imagecreatefromgif($image);
break;
case "image/pjpeg":
case "image/jpeg":
case "image/jpg":
$source=imagecreatefromjpeg($image);
break;
case "image/png":
case "image/x-png":
$source=imagecreatefrompng($image);
break;
}
imagecopyresampled($newImage,$source,0,0,0,0,$newImageWidth,$newImageHeight,$imagewidth,$imageheight);
switch($imageType) {
case "image/gif":
imagegif($newImage,$thumb);
break;
case "image/pjpeg":
case "image/jpeg":
case "image/jpg":
imagejpeg($newImage,$thumb,100);
break;
case "image/png":
case "image/x-png":
imagepng($newImage,$thumb);
break;
}
return $thumb;
}