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108 lines
4.0 KiB
PHP
Executable File
108 lines
4.0 KiB
PHP
Executable File
<?php
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//namespace lib;
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/**
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* 图片压缩类：通过缩放来压缩。如果要保持源图比例，把参数$percent保持为1即可。
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* 即使原比例压缩，也可大幅度缩小。数码相机4M图片。也可以缩为700KB左右。如果缩小比例，则体积会更小。
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* 结果：可保存、可直接显示。
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*/
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class imgcompress{
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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 $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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//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 = ['.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,$dstName);
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}
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/**
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* 销毁图片
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*/
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public function __destruct(){
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imagedestroy($this->image);
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}
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}
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