php 图片压缩

/**

图片压缩操作类

v1.0

*/

class Image{

private $src;

private $imageinfo;

private $image;

public  $percent = 0.1;

public function __construct($src){

$this->src = $src;

}

/**

打开图片

*/

public 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);

}

/**

操作图片

*/

public 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

*/

public function showImage(){

header('Content-Type: image/'.$this->imageinfo['type']);

$funcs = "image".$this->imageinfo['type'];

$funcs($this->image);

}

/**

保存图片到硬盘

*/

public function saveImage($name){

$funcs = "image".$this->imageinfo['type'];

$funcs($this->image,$name.'.'.$this->imageinfo['type']);

}

/**

销毁图片

*/

public function __destruct(){

imagedestroy($this->image);

}

}

<?php

percent = 0.2;

$image->openImage();

$image->thumpImage();

$image->showImage();

$image->saveImage(md5("aa123"));

原文地址：http://blog.csdn.net/gaoxuaiguoyi/article/details/49592151