124 lines
3.9 KiB
PHP
Executable File
124 lines
3.9 KiB
PHP
Executable File
<?php
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/**
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* @param string $src 源图
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* @param float $percent 压缩比例
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* 简单图床修改版
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* 此类压缩单文件
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* https://www.cnblogs.com/jiji/p/12928028.html
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*/
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class Imgcompress
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{
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private $src;
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private $image;
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private $imageinfo;
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private $percent = 0.5;
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/**
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* 图片压缩
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* @param string $src 源图
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* @param float $percent 压缩比例
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*/
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public function __construct($src, $percent = 1)
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{
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$this->src = $src;
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$this->percent = $percent;
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}
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/** 高清压缩图片
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* @param string $saveName 提供图片名（可不带扩展名，用源图扩展名）用于保存。或不提供文件名直接显示
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*/
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public function compressImg($saveName = '')
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{
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$this->_openImage();
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if (!empty($saveName)) $this->_saveImage($saveName); //保存
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else $this->_showImage();
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}
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/**
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* 内部：打开图片
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*/
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private function _openImage()
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{
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list($width, $height, $type, $attr) = getimagesize($this->src);
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$this->imageinfo = array(
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'width' => $width,
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'height' => $height,
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'type' => image_type_to_extension($type, false),
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'attr' => $attr
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);
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$fun = "imagecreatefrom" . $this->imageinfo['type'];
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$this->image = $fun($this->src);
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$this->_thumpImage();
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}
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/**
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* 内部：操作图片
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*/
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private function _thumpImage()
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{
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$new_width = $this->imageinfo['width'] * $this->percent;
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$new_height = $this->imageinfo['height'] * $this->percent;
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$image_thump = imagecreatetruecolor($new_width, $new_height);
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/**
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* 保留图片透明通道
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* 简单图床 EasyImage 2.0 2021-5-9 21:48:59
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* 参考: https://www.imooc.com/wenda/detail/581249
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*/
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imagealphablending($image_thump, false);
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imagesavealpha($image_thump, true);
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//将原图复制带图片载体上面，并且按照一定比例压缩,极大的保持了清晰度
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imagecopyresampled($image_thump, $this->image, 0, 0, 0, 0, $new_width, $new_height, $this->imageinfo['width'], $this->imageinfo['height']);
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imagedestroy($this->image);
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$this->image = $image_thump;
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}
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/**
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* 输出图片:保存图片则用saveImage()
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*/
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private function _showImage()
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{
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header('Content-Type: image/' . $this->imageinfo['type']);
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$funcs = "image" . $this->imageinfo['type'];
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$funcs($this->image);
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}
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/**
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* 保存图片到硬盘：
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* @param string $dstImgName 1、可指定字符串不带后缀的名称，使用源图扩展名 。2、直接指定目标图片名带扩展名。
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*/
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private function _saveImage($dstImgName)
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{
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if (empty($dstImgName)) return false;
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$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
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$dstExt = strrchr($dstImgName, ".");
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$sourseExt = strrchr($this->src, ".");
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if (!empty($dstExt)) $dstExt = strtolower($dstExt);
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if (!empty($sourseExt)) $sourseExt = strtolower($sourseExt);
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//有指定目标名扩展名
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if (!empty($dstExt) && in_array($dstExt, $allowImgs)) {
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$dstName = $dstImgName;
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} elseif (!empty($sourseExt) && in_array($sourseExt, $allowImgs)) {
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$dstName = $dstImgName . $sourseExt;
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} else {
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$dstName = $dstImgName . $this->imageinfo['type'];
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}
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$funcs = "image" . $this->imageinfo['type'];
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$funcs($this->image, $dstName);
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}
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/**
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* 销毁图片
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*/
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public function __destruct()
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{
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imagedestroy($this->image);
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}
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}
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