标题：Url Rewriter URL重写
出处：php源码网-开源程序大全(Open Source)
时间：Wed, 21 Nov 2007 00:39:37 +0000
作者：shuguang
地址：http://www.osphp.com.cn/read.php/327.htm

内容：
程序名称：Url Rewriter 
开发者/组织名称：Cesar D. Rodas
运行环境：php+mysql,php+文本 
官方网站：http://www.thyphp.com/
文章来源：http://www.OSphp.com.cn
下载地址：点击下载源码文件
程序介绍：
This class can be used to redirect requests based on URL rewriting rules.

It can check whether the current request URL matches one or more rules.

If one of the defined rules is matched, the class determines the path of a PHP script that will handle the request and executes that script using the PHP require command.

If none of the rules matches, the class include the default error script and returns the 404 status code to the browser.

{downsource}

URL Rewriter
Cesar D. Rodas <cesar@sixdegrees.com>

This class provides an easy mechanism to manage URL rewriting, avoiding to write and manage the  ".htaccess" file.
Another issue is that you can use a personalized regular expression for create friendlies URL.

I. Basic Structure
   <?php
        require "url_rewriter.php";
        $url = new url_rewriter('example/');
        $url->e404 = "error.php"; 
        // regular expression rules goes here
        $url->execute();
   ?>

II. Regular Expressions
    The regular expression are simple a set of constants, variable, and optionals parts.
    Example:
        $country=array('Argentina','Brasil','Paraguay');
        $url->add_rule("index.php","/[country]/{index.html}", array('country'=> $country) ); 
       
    If the first rule give true, "index.php" will be executed. For that country must be "Argentina", "Brasil" or "Paraguay" (this is because we force with the third parameter. "Country" must be in $country), and must exist an "index.html" or nothing.
    
        * /Paraguay/index.html  : Match
        * /Paraguay/                  : Match
        * /Paraguay/foo.html     : Mismatch
    
    The :numberX, where X is an identification, variable is an special variable that it must be numeric for match.
    
    Example:
        $country=array('Argentina','Brasil','Paraguay');
        $url->add_rule("foo.php","/[country]/[str]-[:number1]-site{-[:number2]}.[ext]", array('country'=> $country,':number2' => 2) );
        
        * /Paraguay/some_string-123-site.html                       :    Match
        * /Paraguay/some_other_string-123-site-456.html     :    Mismatch
        * /Paraguay/some_other_string-123-site-2.html         :    Match
        * /Paraguay/some_other_string-123-site-foo.html      :    Mismatch

III. Real life example
    Steps for  translate a page which is "foo.php?id=45" to its URL friendly mode.
    *   Download http://cesars.users.phpclasses.org/url_rewriter
    *   Edit url_handler.php
    *   Add a new rule
        $url->add_rule("foo.php","/entry-[:number1].html");
    *   Change all your links
        foo.php?id=45 for /entry-45.html
    * Edit foo.php adding an extra header
       <?php
            $id = $urlVars['number1'];
            //check if $id exist
             if ($id not exist) $urlHandler->error404();
            //handle request as you did before
        ?>            




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