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

<?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