PHP等比例压缩图片的实例代码

= 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,$new_width,$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($image_wp,$height); //90代表的是质量、压缩图片容量大小 imagejpeg($image_wp,90); imagedestroy($image_wp); imagedestroy($image); break; case 3: header('Content-Type:image/png'); $image_wp = imagecreatetruecolor($new_width,$new_height); $image = imagecreatefrompng($imgsrc); imagecopyresampled($image_wp,90); imagedestroy($image_wp); imagedestroy($image); break; } }