PHP图片压缩类
首页服务器要安装 Imagick扩展
//引入类
import('imgick');
$img = new Imgick_tool(); //实例化
$img->slimming('图片路径','压缩比例','压缩完后的路径'); //压缩比例 1-100
压缩类：
<?php
/**
* 图片压缩类库
*
*/
class Imgick_tool{
//Imagick对象实例
public $obj = null;
public function __construct()
{
//判断是否加载了该扩展
if(!extension_loaded('Imagick'))
{
return false;
}
$this->obj = new Imagick();
}
/*
* png2jpg转换图片格式
*
* @param string src_img 源图片路径
* @param string dest_img 要生成的图片的路径
* @return boolean 转换成共返回true 否则false
*/
public function png2jpg($src_img,$dest_img)
{
if(!is_object($this->obj))
{
return false;
}
try
{
$this->obj->readImage($src_img);
if($this->obj->writeImage($dest_img))
{
$this->destory();
return $dest_img;
}
return false;
}
catch (ImagickException $e)
{
return false;
}
}
/*
* 去掉图片的profile信息
*
* @param string src_img 源图片路径
* @return string src_img 图片名称 否则返回false
*/
public function strip_profile($src_img,$dest_img = '')
{
if(!is_object($this->obj))
{
return false;
}
try
{
$dest_img = empty($dest_img) ? $src_img : $dest_img;
$this->obj->readImage($src_img);
$this->obj->stripImage ();
if($this->obj->writeImage ($dest_img))
{
$this->destory();
return $src_img;
}
return false;
}
catch (ImagickException $e)
{
return false;
}
}
/*
* 设置jpg图片质量
*
* @param string src_img 源图片路径
* @param string dest_img 要生成的图片的路径
* @return boolean 转换成共返回true 否则false
*/
public function set_quality($src_img,$quality = 70,$dest_img = '')
{
if(!is_object($this->obj))
{
return false;
}
try
{
$dest_img = empty($dest_img) ? $src_img : $dest_img;
$this->obj->readImage($src_img);
$this->obj->setImageCompression(Imagick::COMPRESSION_JPEG);
$this->obj->setImageCompressionQuality($quality);
if($this->obj->writeImage($dest_img))
{
$this->destory();
return $dest_img;
}
return false;
}
catch (ImagickException $e)
{
return false;
}
}
/*
* 图片瘦身
*
* @param string src_img 源图片路径
* @param int quality 设置图片压缩质量
* @param string dest_img 要生成的图片的路径
* @return boolean 转换成共返回true 否则false
*/
public function slimming($src_img,$quality = 60,$dest_img = '')
{
if(!is_object($this->obj))
{
return false;
}
try
{
$dest_img = empty($dest_img) ? $src_img : $dest_img;
$this->obj->readImage($src_img);
$this->obj->setImageFormat('jpeg');
$this->obj->setImageCompression(Imagick::COMPRESSION_JPEG);
//将图片的质量降低到原来的60%
$quality = $this->obj->getImageCompressionQuality() * $quality / 100;
$this->obj->setImageCompressionQuality($quality);
$this->obj->stripImage();
if($this->obj->writeImage($dest_img))
{
$this->destory();
return $dest_img;
}
return false;
}
catch (ImagickException $e)
{
return false;
}
}
/*
* 生成缩略图
*
* @param string src_img 源图片路径
* @param int quality 设置图片压缩质量
* @param string dest_img 要生成的图片的路径
* @return boolean 转换成共返回true 否则false
*/
public function thump($src_img,$width = 250,$height = '')
{
if(!is_object($this->obj))
{
return false;
}
try
{
$file_info = pathinfo($src_img);
//生成缩略图名称
$file_name = substr($file_info['basename'],0,strrpos($file_info['basename'],'.'));
$dest_img = $file_info['dirname'] . '/' . $file_name . '_thump.' . $file_info['extension'];
$this->obj->readImage($src_img);
//计算要获得缩略图的高度
$img_width = $this->obj->getImageWidth();
$img_height = $this->obj->getImageHeight();
$dest_height = $img_height * ($width / $img_width);
$this->obj->resizeImage($width, $dest_height, Imagick::FILTER_CATROM, 1, false);
//生成图片
if($this->obj->writeImage($dest_img))
{
$this->destory();
return $dest_img;
}
return false;
}
catch (ImagickException $e)
{
return false;
}
}
/*
* 释放资源
*
*/
function destory()
{
if(is_object($this->obj))
{
$this->obj->clear();
$this->obj->destroy();
}
}
}
?>压缩类下载地址：
