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PHPµÄrealpath(...)
Author:zfive5(zidong)
Email :zfive5@yahoo.com.cn
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PHP realpath() º¯Êý
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    realpath() º¯Êý·µ»Ø¾ø¶Ô·¾¶¡£
    ¸Ãº¯Êýɾ³ýËùÓзûºÅÁ¬½Ó£¨±ÈÈç '/./', '/../' ÒÔ¼°¶àÓàµÄ '/'£©£¬·µ»Ø¾ø¶Ô·¾¶Ãû¡£
    Èôʧ°Ü£¬Ôò·µ»Ø false¡£±ÈÈç˵Îļþ²»´æÔڵϰ¡£
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    readlink(linkpath)
²ÎÊý ÃèÊö
    linkpath ±ØÐè¡£¹æ¶¨Òª¼ì²éµÄÁ¬½Ó·¾¶¡£
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    ÔÚ BSD ϵͳÉÏ£¬Èç¹û½ö½öÊÇ linkpath ²»´æÔڵϰ£¬PHP ²¢²»»áÏñÆäËüϵͳÄÇÑù·µ»Ø false¡£
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WebSite
    |
    |--1.php
    |
    |--txt11
    |   |--2.php
1.php:
<?php
    require("./txt/2.php")
    output "1.php ·¾¶:".realpath("./")."<br/>";
?>
2.php:
<?php
   output "2.php ·¾¶:".realpath("./")."<br/>";
?>
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http://localhost:8080/1.php
http://localhost:8080/txt/2.php
 
      require() ËùÖ¸¶¨ÒýÈëµÄÎļþ(2.php)£¬Ê¹Ëü±ä³ÉPHP³ÌÐòÍøÒ³(1.php)µÄÒ»²¿·Ý,ËùÒԲŻá³öÏÖ²»Í¬£¬¸öÈ˸оõΪÁ˱ÜÃârealpath Óë require »ìÓôøÀ´µÄ²»È·¶¨ÐÔ£¬½¨ÒéʹÓÃ$_SERVE['DOCUMENT_ROOT']
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