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PHP对表单提交特殊字符的过滤和处理方法汇总_PHP

Jun 01, 2016 am 11:55 AM
php form submission

PHP关于表单提交特殊字符的处理方法做个汇总,主要涉及htmlspecialchars/addslashes/stripslashes/strip_tags/mysql_real_escape_string等几个函数联合使用,与大家共同交流。

一、几个与特殊字符处理有关的PHP函数

函数名

释义

介绍

htmlspecialchars

将与、单双引号、大于和小于号化成HTML格式

&转成&
"转成"
' 转成'
>转成>

htmlentities()

所有字符都转成HTML格式

除上面htmlspecialchars字符外,还包括双字节字符显示成编码等。

 


 


 


addslashes

单双引号、反斜线及NULL加上反斜线转义

被改的字符包括单引号(')、双引号(")、反斜线backslash (\) 以及空字符NULL。

stripslashes

去掉反斜线字符

去掉字符串中的反斜线字符。若是连续二个反斜线,则去掉一个,留下一个。若只有一个反斜线,就直接去掉。

 


 


 


quotemeta

加入引用符号

将字符串中含有. \\ + * ? [ ^ ] ( $ ) 等字符的前面加入反斜线"\" 符号。

nl2br()

将换行字符转成

 


strip_tags

去掉HTML及PHP标记

去掉字符串中任何HTML标记和PHP标记,包括标记封堵之间的内容。注意如果字符串HTML及PHP标签存在错误,也会返回错误。

mysql_real_escape_string

转义SQL字符串中的特殊字符

转义\x00 \n \r 空格 \ ' " \x1a,针对多字节字符处理很有效。mysql_real_escape_string会判断字符集,mysql_escape_string则不用考虑。

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