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请问：关于过滤函数的疑问

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Release： 2016-06-13 12:57:45
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请教：关于过滤函数的疑问
大家好：
    关于过滤函数觉得官方资料讲得不是很清楚，特向大家请教一下：
FILTER_SANITIZE_STRING 这个过滤器“去除标签，去除或编码特殊字符”具体是指哪些特殊字符啊？哪些特殊字符是去除的，哪些是编码的？谁有这方面的具体的说明资料吗？
------解决方案--------------------
mysql_real_escape
------解决方案--------------------

引用:
我想对用户的输入进行过滤，1.去除字母、数字和汉字外的其他字符。2.防sql注入。php里面有现成的过滤函数可用吗？

实现了1，就实现了2.
假定你使用的是 utf-8 编码
$text = preg_replace('/\W/u', '', $text);
Related labels：
escape nbsp replace text
source：php.cn
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