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php实现根据url自动生成缩略图的方法_PHP

WBOY
Release: 2016-05-31 19:29:54
Original
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本文实例讲述了php实现根据url自动生成缩略图的方法,是非常实用的功能。分享给大家供大家参考。具体方法如下:

原理:设置apache rewrite ,当图片不存在时,调用php创建图片。

例如:

原图路径为:http://localhost/upload/news/2013/07/21/1.jpg
缩略图路径为:http://localhost/supload/news/2013/07/21/1.jpg

当访问 http://localhost/supload/news/2013/07/21/1.jpg 时,如图片存在,则显示图片。否则,调用createthumb.php生成图片。

目录结构如下:

www/PicThumb.class.php
www/ThumbConfig.php
www/upload/news/2013/07/21/1.jpg
www/upload/article/2013/07/21/2.jpg
www/supload/.htaccess
www/supload/watermark.png
www/supload/createthumb.php

http://localhost/ 指向 www目录

PicThumb.class.php 用法请查看这里:http://www.bitsCN.com/article/55530.htm

需要开启apache rewrite:

sudo a2enmod rewrite 

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.htaccess文件如下:

<IfModule mod_rewrite.c> 
RewriteEngine On 
 
# '-s' (is regular file, with size) 
# '-l' (is symbolic link) 
# '-d' (is directory) 
# 'ornext|OR' (or next condition) 
# 'nocase|NC' (no case) 
# 'last|L' (last rule) 
 
RewriteCond %{REQUEST_FILENAME} -s [OR] 
RewriteCond %{REQUEST_FILENAME} -l [OR] 
RewriteCond %{REQUEST_FILENAME} -d 
RewriteRule ^.*$ - [NC,L] 
RewriteRule ^.*$ createthumb.php&#63;path=%{REQUEST_URI} [NC,L] 
 
</IfModule>

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createthumb.php文件如下:

<&#63;php
define('WWW_PATH', dirname(dirname(__FILE__))); // 站点www目录 
 
require(WWW_PATH.'/PicThumb.class.php'); // include PicThumb.class.php 
require(WWW_PATH.'/ThumbConfig.php');  // include ThumbConfig.php 
 
$logfile = WWW_PATH.'/createthumb.log'; // 日志文件 
$source_path = WWW_PATH.'/upload/';   // 原路径 
$dest_path = WWW_PATH.'/supload/';    // 目标路径 
 
$path = isset($_GET['path'])&#63; $_GET['path'] : ''; // 访问的图片URL 
 
// 检查path 
if(!$path){ 
  exit(); 
} 
 
// 获取图片URI 
$relative_url = str_replace($dest_path, '', WWW_PATH.$path); 
 
// 获取type 
$type = substr($relative_url, 0, strpos($relative_url, '/')); 
 
// 获取config 
$config = isset($thumb_config[$type])&#63; $thumb_config[$type] : ''; 
 
// 检查config 
if(!$config || !isset($config['fromdir'])){ 
  exit(); 
} 
 
// 原图文件 
$source = str_replace('/'.$type.'/', '/'.$config['fromdir'].'/', $source_path.$relative_url); 
 
// 目标文件  
$dest = $dest_path.$relative_url; 
 
// 创建缩略图 
$obj = new PicThumb($logfile); 
$obj->set_config($config); 
if($obj->create_thumb($source, $dest)){ 
  ob_clean(); 
  header('content-type:'.mime_content_type($dest)); 
  exit(file_get_contents($dest)); 
} 
 
&#63;>

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ThumbConfig.php文件如下:

<&#63;php 
 
$thumb_config = array( 
 
  'news' => array( 
    'fromdir' => 'news', // 来源目录 
    'type' => 'fit', 
    'width' => 100, 
    'height' => 100, 
    'bgcolor' => '#FF0000' 
  ), 
 
  'news_1' => array( 
    'fromdir' => 'news', 
    'type' => 'fit', 
    'width' => 200, 
    'height' => 200, 
    'bgcolor' => '#FFFF00' 
  ), 
 
  'article' => array( 
    'fromdir' => 'article', 
    'type' => 'crop', 
    'width' => 250, 
    'height' => 250, 
    'watermark' => WWW_PATH.'/supload/watermark.png' 
  ) 
 
); 
 
&#63;>

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访问这三个路径后会按config自动生成缩略图 
http://localhost/supload/news/2013/07/21/1.jpg 
http://localhost/supload/news_1/2013/07/21/1.jpg 
http://localhost/supload/article/2013/07/21/2.jpg 

本文所述实例完整代码点击此处本站下载。

希望本文所述对大家的php程序设计有所帮助。

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