定义和用法FILTER_SANITIZE_MAGIC_QUOTES 过滤器对字符串执行 addslashes() 函数。该过滤器在预定义的字符串前面设置反斜杠。预定义字符是：单引号(')双引号 (")反斜线 (\)NULLFILTER_SANITIZE_MAGIC_QUOTES 信息：Name: "magic_quotes"ID-number: 521实例<?php$var="Peter's here!"; var_dump(filter_var($var, FILTER_SANITIZE_MAGIC_QUOTES));?>代码的输出如下所示：string(14) "Peter\'s here!"
