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PHP 快速 URL 重寫機制（需 PHP 5.3+）

編輯：PHP 綜合知識

前言

Apache 的 rewrite 模組設定非本文重點，請參閱其他文章。本類別僅支援 PHP 5.3.0 以上版本，繼承上一版單一類別、全靜態呼叫的特點，新增跨模組呼叫功能，讓模組與頁面間的函式共享更簡單。

.htaccess 設定範例

#-------------- .htaccess start ---------------
RewriteEngine on
RewriteRule !\.(js|ico|gif|jpg|png|css|swf|htm|txt)$ index.php
php_flag magic_quotes_gpc off
php_flag register_globals off
#-------------- .htaccess end ---------------

啟用重寫功能

在站點根目錄的 index.php 末尾加入以下程式碼即可啟用重寫（前提：Apache rewrite 正常、.htaccess 支援已開啟、類別檔 class.rewrite.php 已載入、模組檔案位置與寫法正確）：

//........
Rewrite::__config(
    $config['path'],      // URL 基礎位置，例如 'https://xxxxx/mysite/'
    $config['md_path'],   // 模組檔案實體目錄，例如 'c:/phpsite/www/mysite/modules/'
    array('phpinfo')      // 允許直接呼叫的系統函式
);
Rewrite::__parse();
//........

模組檔案寫法範例

檔案名稱：testPk.php

<?php
class Rw_testPk extends Rewrite {
    // 前導函式：只要存取 testpk 頁面必定執行，可用於權限控制或全域變數
    public static function init() {
        // if (!defined('SITE_PASS')) {
        echo self::$linktag . '<br/>'; // self::$linktag 為頁面解析路徑值
        // }
    }

    // 存取 "https://localhost/testpk/" 時執行
    public static function index() {
        echo 'test';
    }

    // 存取 "https://localhost/testpk/blank" 或 "https://localhost/testpk/index/blank" 時執行
    public static function blank() {}
}
?>

核心類別：class.rewrite.php

<?php
class Rewrite {
    public static $debug = false;           // 是否開啟除錯
    public static $time_pass = 0;           // 模組整體執行時間
    public static $version = 2.2;
    public static $pretag = 'Rw_';          // 模組類別名稱前綴
    public static $linktag = 'index';       // 頁面連結標記，用於選單效果與存取權限
    protected static $time_start = 0;
    protected static $time_end = 0;
    protected static $physical_path = '';   // 模組檔案實體路徑
    protected static $website_path = '';    // 模組站點路徑（可能在子目錄）
    protected static $ob_contents = '';
    protected static $uid = 0;              // 配合個人主頁存取，如 https://localhost/423/ 對應 profile?uid=423
    private static $allow_sys_fun = array(); // 允許的系統函式

    private static function __get_microtime() {
        list($usec, $sec) = explode(" ", microtime());
        return ((float)$usec + (float)$sec);
    }

    public static function __debug($d = true) {
        static::$debug = $d;
    }

    public static function __config($website_path = '', $physical_path = '', $allow_sys_fun = array()) {
        self::$physical_path = $physical_path;
        self::$website_path = $website_path;
        self::$allow_sys_fun = $allow_sys_fun;
    }

    public static function __msg($str) {
        if (static::$debug) {
            echo "\n<pre>\n" . print_r($str, true) . "\n</pre>\n";
        }
    }

    public static function __start() {
        self::$time_start = self::__get_microtime();
    }

    public static function __end($re = false) {
        self::$time_end = self::__get_microtime();
        self::$time_pass = round((self::$time_end - self::$time_start), 6) * 1000;
        if ($re) {
            return self::$time_pass;
        } else {
            self::__msg('PASS_TIME: ' . self::$time_pass . ' ms');
        }
    }

    // 內部跨模組 URL 解析呼叫
    public static function __parseurl($url = '', $fun = '', $data = NULL) {
        if (!empty($url) && !empty($fun)) {
            $p = static::$physical_path;
            if (file_exists($p . $url) || file_exists($p . $url . '.php')) {
                $part = strtolower(basename($p . $url, '.php'));
                static::$linktag = $part . '/' . $fun;
                $fname = static::$pretag . $part;
                if (class_exists($fname, false)) {
                    if (method_exists($fname, $fun)) {
                        return $fname::$fun($data);
                    }
                } else {
                    include($p . $url);
                    if (class_exists($fname, false) && method_exists($fname, $fun)) {
                        return $fname::$fun($data);
                    }
                }
            }
        }
    }

    // 核心連結解析函式
    public static function __parse($Url = '') {
        self::__start();
        $p = static::$physical_path;
        $w = static::$website_path;
        $req_execute = false;
        $url_p = empty($Url) ? $_SERVER['REQUEST_URI'] : $Url;
        $local = parse_url($w);
        $req = parse_url($url_p);
        $req_path = preg_replace('|[^\w/.\\\]|', '', $req['path']);
        $req_para = empty($Url) ? strstr($_SERVER['SERVER_NAME'], '.', true) : 'www';

        if (empty($Url) && substr_count($_SERVER['SERVER_NAME'], '.') == 2 && $req_para != 'www') {
            self::__goto($req_para, preg_replace('|^' . $local['path'] . '|', "", $req_path));
            return;
        } else {
            $req_path_arr = empty($req_path) ? array() : preg_split("|[/\\\]+|", preg_replace('|^' . $local['path'] . '|', "", $req_path));
            $req_fun = array_pop($req_path_arr);
            if (substr($req_fun, 0, 2) == '__') {
                $req_fun = substr($req_fun, 2);
            }
            $req_path_rearr = array_filter($req_path_arr);
            self::__msg($req_path_rearr);
            $req_temp = implode('/', $req_path_rearr);
            $fname = $req_temp . '/' . $req_fun;

            if (!empty($req_fun) && in_array($req_fun, static::$allow_sys_fun)) {
                $req_fun();
            } else {
                if (!empty($req_fun) && file_exists($p . $fname . '.php')) {
                    include($p . $fname . '.php');
                } else {
                    $fname = empty($req_temp) ? 'index' : $req_temp;
                    if (file_exists($p . $fname . '.php')) {
                        include($p . $fname . '.php');
                    } else {
                        $fname = $req_temp . '/index';
                        if (file_exists($p . $fname . '.php')) {
                            include($p . $fname . '.php');
                        } else {
                            // 個人主頁特殊導向
                            $uid = is_numeric($req_temp) ? $req_temp : strstr($req_temp, '/', true);
                            $ufun = is_numeric($req_temp) ? 'index' : strstr($req_temp, '/');
                            if (is_numeric($uid)) {
                                self::$uid = $uid;
                                if (!isset($_GET['uid'])) $_GET['uid'] = $uid;
                                $fname = 'profile/' . $ufun;
                                if (file_exists($p . $fname . '.php')) {
                                    include($p . $fname . '.php');
                                } else {
                                    header("location:" . $w);
                                    exit();
                                }
                            } else if (file_exists($p . 'index.php')) {
                                $fname = 'index';
                                include($p . 'index.php');
                            } else {
                                header("location:" . $w);
                                exit();
                            }
                        }
                    }
                }
            }

            $ev_fname = strrpos($fname, '/') === false ? $fname : substr($fname, strrpos($fname, '/') + 1);
            $ev_fname = static::$pretag . $ev_fname;
            if (class_exists($ev_fname, false) && method_exists($ev_fname, $req_fun)) {
                static::$linktag = $req_fun == 'index' ? $fname . '/' : $fname . '/' . $req_fun;
                if ($req_fun != 'init' && method_exists($ev_fname, 'init')) {
                    $ev_fname::init();
                }
                $ev_fname::$req_fun();
            } else if (class_exists($ev_fname, false) && method_exists($ev_fname, 'index')) {
                static::$linktag = $fname . '/';
                if (method_exists($ev_fname, 'init')) {
                    $ev_fname::init();
                }
                $ev_fname::index();
            } else if ($fname != 'index' && class_exists(static::$pretag . 'index', false) && method_exists(static::$pretag . 'index', 'index')) {
                $ev_fname = static::$pretag . 'index';
                static::$linktag = 'index/';
                if (method_exists($ev_fname, 'init')) {
                    $ev_fname::init();
                }
                $ev_fname::index();
            } else {
                self::__msg('Function Not Exist!');
            }
        }
        self::__end();
    }

    // 使用者自訂連結解析（資料庫儲存）
    public static function __goto($para = '', $path = '') {
        $w = static::$website_path;
        if (empty($para)) {
            exit('未知連結，解析失敗，無法存取');
        }
        if (class_exists('Parseurl')) {
            $prs = Parseurl::selectone(array('tag', '=', $para));
            self::__msg($prs);
            if (!empty($prs)) {
                $parastr = $prs['tag'];
                $output = array();
                $_GET[$prs['idtag']] = $prs['id'];
                parse_str($prs['parastr'], $output);
                $_GET = array_merge($_GET, $output);
                $path = $prs['type'] . '/' . preg_replace('|^/' . $prs['type'] . '|', '', $path);
                self::__msg($path);
                header('location:' . $w . $path . '?' . http_build_query($_GET));
                exit();
            } else {
                header("location:" . $w);
                exit();
            }
        } else {
            header("location:" . $w);
            exit();
        }
    }
}
?>