PHP图片压缩类,高清无损直接用就ok啦


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); }}

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