php后台图片压缩_php实现等比例压缩图片

/**

* desription 压缩图片

* @param sting $imgsrc 图片路径

* @param string $imgdst 压缩后保存路径

*/

public function compressedImage($imgsrc, $imgdst) {

list($width, $height, $type) = getimagesize($imgsrc);

$new_width = $width;//压缩后的图片宽

$new_height = $height;//压缩后的图片高

if($width >= 600){

$per = 600 / $width;//计算比例

$new_width = $width * $per;

$new_height = $height * $per;

}

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);

//90代表的是质量、压缩图片容量大小

imagejpeg($image_wp, $imgdst, 90);

imagedestroy($image_wp);

imagedestroy($image);

}

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);

//90代表的是质量、压缩图片容量大小

imagejpeg($image_wp, $imgdst, 90);

imagedestroy($image_wp);

imagedestroy($image);

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);

//90代表的是质量、压缩图片容量大小

imagejpeg($image_wp, $imgdst, 90);

imagedestroy($image_wp);

imagedestroy($image);

break;

}

}