php缩放图片(根据宽高的等比例缩放)实例介绍

推荐一个简单实用的缩放图片工具 SimpleImage，参考http://www.white-hat-web-design.co.uk/blog/resizing-images-with-php/ 使用方法： 设定宽高，不等比例缩放
复制代码 代码如下:
<?php
include("SimpleImage.php");
$image = new SimpleImage();
$image->load("picture.jpg");
$image->resize(250,400);
$image->save("picture2.jpg");?> 设定宽度，等比例缩放<?php
include("SimpleImage.php");
$image = new SimpleImage();
$image->load("picture.jpg");
$image->resizeToWidth(250);
$image->save("picture2.jpg");?> 设定高度，等比例缩放<?php
include("SimpleImage.php");
$image = new SimpleImage();
$image->load("picture.jpg");
$image->resizeToHeight(500);
$image->save("picture2.jpg");
$image->resizeToHeight(200);
$image->save("picture3.jpg");?> 按比例，缩放至50%<?php
include("SimpleImage.php");
$image = new SimpleImage();
$image->load("picture.jpg");
$image->scale(50);
$image->save("picture2.jpg");?>缩放后直接输出到屏幕<?php
header("Content-Type: image/jpeg");
include("SimpleImage.php");
$image = new SimpleImage();
$image->load("picture.jpg");
$image->resizeToWidth(150);
$image->output();?>
SimpleImage.php 源码请轻点文章开头链接，到那下载