这个不完全是我自己写的-_-！,但是好用呀
<?php/** * Created by PhpStorm. * Note：文件介绍 * User: Lynly * Date: 2018/11/19 * Time: 14:33 */class Imgcompress{ ???private $src; ???private $image; ???private $imageinfo; ???private $percent = 0.5; ???/** ????* 图片压缩 ????* @param string $src 源图 ????* @param float $percent 压缩比例 ????*/ ???public function __construct($src, $percent = 1) ???{ ???????$this->src = $src; ???????$this->percent = $percent; ???} ???/** 高清压缩图片 ????* @param string $saveName 提供图片名（可不带扩展名，用源图扩展名）用于保存。或不提供文件名直接显示 ????*/ ???public function compressImg($saveName = ‘‘) ???{ ???????$this->_openImage(); ???????if (!empty($saveName)) $this->_saveImage($saveName); ?//保存 ???????else $this->_showImage(); ???} ???/** ????* 内部：打开图片 ????*/ ???private function _openImage() ???{ ???????list($width, $height, $type, $attr) = getimagesize($this->src); ???????$this->imageinfo = array( ???????????‘width‘ => $width, ???????????‘height‘ => $height, ???????????‘type‘ => image_type_to_extension($type, false), ???????????‘attr‘ => $attr ???????); ???????$fun = "imagecreatefrom" . $this->imageinfo[‘type‘]; ???????$this->image = $fun($this->src); ???????$this->_thumpImage(); ???} ???/** ????* 内部：操作图片 ????*/ ???private function _thumpImage() ???{ ???????$new_width = $this->imageinfo[‘width‘] * $this->percent; ???????$new_height = $this->imageinfo[‘height‘] * $this->percent; ???????$image_thump = imagecreatetruecolor($new_width, $new_height); ???????//将原图复制带图片载体上面，并且按照一定比例压缩,极大的保持了清晰度 ???????imagecopyresampled($image_thump, $this->image, 0, 0, 0, 0, $new_width, $new_height, $this->imageinfo[‘width‘], $this->imageinfo[‘height‘]); ???????imagedestroy($this->image); ???????$this->image = $image_thump; ???} ???/** ????* 输出图片:保存图片则用saveImage() ????*/ ???private function _showImage() ???{ ???????header(‘Content-Type: image/‘ . $this->imageinfo[‘type‘]); ???????$funcs = "image" . $this->imageinfo[‘type‘]; ???????$funcs($this->image); ???} ???/** ????* 保存图片到硬盘： ????* @param ?string $dstImgName 1、可指定字符串不带后缀的名称，使用源图扩展名 。2、直接指定目标图片名带扩展名。 ????*/ ???private function _saveImage($dstImgName) ???{ ???????if (empty($dstImgName)) return false; ???????$allowImgs = array(‘.jpg‘, ‘.jpeg‘, ‘.png‘, ‘.bmp‘, ‘.wbmp‘, ‘.gif‘); ??//如果目标图片名有后缀就用目标图片扩展名 后缀，如果没有，则用源图的扩展名 ???????$dstExt = strrchr($dstImgName, "."); ???????$sourseExt = strrchr($this->src, "."); ???????if (!empty($dstExt)) $dstExt = strtolower($dstExt); ???????if (!empty($sourseExt)) $sourseExt = strtolower($sourseExt); ???????//有指定目标名扩展名 ???????if (!empty($dstExt) && in_array($dstExt, $allowImgs)) { ???????????$dstName = $dstImgName; ???????} elseif (!empty($sourseExt) && in_array($sourseExt, $allowImgs)) { ???????????$dstName = $dstImgName . $sourseExt; ???????} else { ???????????$dstName = $dstImgName . $this->imageinfo[‘type‘]; ???????} ???????$funcs = "image" . $this->imageinfo[‘type‘]; ???????$funcs($this->image, $dstName); ???} ???/** ????* 销毁图片 ????*/ ???public function __destruct() ???{ ???????imagedestroy($this->image); ???}}PHP图片压缩类，高清无损直接用就ok啦
原文地址：https://www.cnblogs.com/thatme/p/10200600.html