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Homephp教程php手册PHP中addslashes()和stripslashes()实现字符串转义和还原用法实例,转义字符的用法

PHP中addslashes()和stripslashes()实现字符串转义和还原用法实例,转义字符的用法

本文实例讲述了PHP中addslashes()和stripslashes()实现字符串转义和还原用法。分享给大家供大家参考,具体如下:

PHP中addslashes() 函数返回在预定义字符之前添加反斜杠的字符串

预定义字符是:

单引号(')
双引号(")
反斜杠(\)
NULL

stripslashes() 函数删除由 addslashes() 函数添加的反斜杠

用法示例如下:

<&#63;php
 $str="select * from `book` where bookname='帮客之家'";
 echo $str."<br/>";//输出字符串$str
 echo $astr=addslashes($str);//字符串转义并输出
 echo "<br/>";
 echo stripslashes($astr);//将转义字符串还原
&#63;>

运行结果如下:

select * from `book` where bookname='帮客之家'
select * from `book` where bookname=\'帮客之家\'
select * from `book` where bookname='帮客之家'

补充:

addslashes()与addcslashes()函数的区别:

这是两个写法非常相近但是使用有所区别的函数,addslashes() 函数返回在预定义字符之前添加反斜杠的字符串,而addcslashes() 函数返回在指定字符前添加反斜杠的字符串,因此addcslashes() 函数需要添加附加参数说明需要添加反斜杠的具体字符。

二者具体区别与用法可参考本站相关文章《解析php addslashes()与addcslashes()函数的区别和比较》

希望本文所述对大家PHP程序设计有所帮助。

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