快速掌握PHP引号转义原理
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PHP中有三个设置可以实现自动对’(单引号),”(双引号),(反斜线)和 NULL 字符转移。
PHP称之为魔术引号,这三项设置分别是
magic_quotes_gpc
影响到 HTTP 请求数据(GET,POST 和 COOKIE)。不能在运行时改变。在 PHP 中默认值为 on。
magic_quotes_runtime
如果打开的话,大部份从外部来源取得数据并返回的函数,包括从数据库和文本文件,所返回的数据都会被反斜线转义。该选项可在运行的时改变,在 PHP 中的默认值为 off。
magic_quotes_sybase
如果打开的话,将会使用单引号对单引号进行PHP引号转义而非反斜线。此选项会完全覆盖 magic_quotes_gpc。如果同时打开两个选项的话,单引号将会被转义成 ”。而双引号、反斜线 和 NULL 字符将不会进行转义。
虽然方便的实现了对特殊符号的自动PHP引号转义,但是这样会使得程序效率降低,并导致程序可移植变得麻烦。在不知道服务器ini设置的情况下,还需要调用get_magic_quotes_gpc() ,get_magic_quotes_runtime() 或ini_get()来检测状态。
例如:
<ol class="dp-xml"> <li class="alt"><span><span>if (!get_magic_quotes_gpc()) { </span></span></li> <li> <span>$</span><span class="attribute">lastname</span><span> = </span><span class="attribute-value">addslashes<br></span><span>($_POST['lastname']); </span> </li> <li class="alt"><span>} else { </span></li> <li> <span>$</span><span class="attribute">lastname</span><span> = $_POST['lastname']; </span> </li> <li class="alt"><span>} </span></li> </ol>
因此最好关闭php的魔术引号,根据情况手动用addslashes(),stripslashes()来转义和取消PHP引号转义。可以学习discuz的做法,在配置文件中加入set_magic_quotes_runtime(0);来取消转义。

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