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很多朋友在写php的时候，难免会遇到需要将html标签进行转义存储。比如存入数据库、xml文件等。而存储进去后，读取出来则需要转换成html输出。网上有许多人编写的转换函数，很长很难懂。其实php早就自带有这样的函数。大可不必自己编写。
下面分别介绍这两个函数。
1.htmlentities()函数：
说明：将html标签转换成特殊字符。例如将<script>转换成”<script>”
例子:
[PHP]
- //
An imaginary article submission from a bad user - //
it will redirect anyone to example.com if the code is run in a browser - $userInput
= “I am going to hax0r your site, hahaha! -
<script type='text/javascript'> -
window.location = 'http://www.example.com/' -
</script>'”; -
- //Lets
make it safer before we use it - $userInputEntities
= htmlentities($userInput); -
- //Now
we can display it - echo
$userInputEntities;
由于最近csdn的控件比较垃圾，请将上面的$apos改成单引号。—呼！
上面的语句执行后，将生成下面的结果
[HTML]
- I
am going to hax0r your site, hahaha! -
<script type='text/javascript'> -
window.location = 'http://www.88web.org/' -
</script>'
2.html_entity_decode()函数
说明：将htmlentities()函数转义过的字符串转成html标签。
例子：
[PHP]
- $orig
= “I'll /”walk/” the <b>dog</b> now”; -
- $a
= htmlentities($orig); -
- $b
= html_entity_decode($a); -
- echo
$a; // I will “walk” the <b>dog</b> now -
- echo
$b; // I will “walk” the <b>dog</b> now
