PHP对表单提交特殊字符的过滤和处理方法汇总_PHP
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& |
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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