``` /** * desription 压缩图片 * @param sting $imgsrc 图片路径 * @param string $imgdst 压缩后保存路径 */ private function compressedImage($imgsrc, $imgdst) { list($width, $height, $type) = getimagesize($imgsrc); $new_width = $width>800?800:$width;//图片宽度的限制 $new_height =$height>800?ceil($height*800/$width):$height;//自适应匹配图片高度 switch ($type) { case 1: $giftype = $this->check_gifcartoon($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($image); break; } } /** * desription 判断是否gif动画 * @param sting image_file图片路径 * @return boolean t 是 f 否 */ private function check_gifcartoon($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; } ```