php url路由功能的简单实现代码

<?php
/**
* php url路由功能实例
* by www.jbxue.com
*/
// url 路由规则定义
$urlRule = array(
    'user' => array(// control
'lists' => array(    // action
    //'名称'=>    '默认值,值模式匹配'
    'filter'    => 'all,^(all|normal|admin)$',
    'order'=> ',^-?[a-zA-Z_]+$',
    'curPage'    => '1,^[0-9]+$',
),
    ),
);

function parseUrl(){
    $queryString = array();
    $GLOBALS['control'] = 'index';
    $GLOBALS['action'] = 'index';
    if (isset($_SERVER['PATH_INFO'])){
//获取  pathinfo
$aPathInfo = explode('/', substr($_SERVER['PATH_INFO'], 1, strrpos($_SERVER['PATH_INFO'], '.')-1));
// 获取 control
$GLOBALS['control'] = $aPathInfo[0];
array_shift($aPathInfo);
// 获取 action
$GLOBALS['action'] = (isset($aPathInfo[0]) ? $aPathInfo[0] : 'index');
array_shift($aPathInfo);
// 获取 入口文件名
$GLOBALS['PHP_SELF'] = str_replace($_SERVER['PATH_INFO'], '', $_SERVER['PHP_SELF']);
$queryString = $aPathInfo;
    }
    parseQueryString($queryString);
}

function parseQueryString(array$aQueryString){
    $queryString = array();
    // control 与 action 为默认值时
    if ($GLOBALS['control'] == 'index' && $GLOBALS['action'] == 'index'){
$GLOBALS['queryString'] = $queryString;
return true;
    }
    global $urlRule;
    if (isset($urlRule[$GLOBALS['control']][$GLOBALS['action']])){
$aActionRule = &$urlRule[$GLOBALS['control']][$GLOBALS['action']];
foreach ($aActionRule as $key=>$val){
    // 规则值为 '' 时
    if ($val == '') {
$queryString[$key] = '';
continue;
    }
    if (isset($aQueryString[0])){
// 取得正则表达式
$pattern = '/'.substr($val, strpos($val, ',')+1).'/';
// 模式匹配
if (preg_match($pattern, $aQueryString[0])){
    // 取值
    $queryString[$key] = $aQueryString[0];
    // 弹出值
    array_shift($aQueryString);
}else {
    // 取默认值
    $queryString[$key] = substr($val, 0, strpos($val, ','));
}
    }else {
// 取默认值
$queryString[$key] = substr($val, 0, strpos($val, ','));
    }
}
$GLOBALS['queryString'] = $queryString;
    }else {
throw new Exception('试图访问不存在的页面');
    }
}

parseUrl();

var_dump($GLOBALS['control']);
var_dump($GLOBALS['action']);
var_dump($GLOBALS['queryString']);
?>