What are PHP's escape functions for HTML entity characters?

PHP针对HTML实体字符的转义函数有：1、【htmlspecialchars()】转义特别的字符为HTML实体；2、【htmlspecialchars_decode()】将实体转成HTML代码。

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PHP针对HTML实体字符的转义函数有：

1、htmlspecialchars（）转义特别的字符为HTML实体；

    &#39;&&#39; (ampersand) becomes &#39;&amp;&#39;     &#39;"&#39; (double quote) becomes &#39;&quot;&#39; when ENT_NOQUOTES is not set.     &#39;&#39;&#39; (single quote) becomes &#39;&#039;&#39; only when ENT_QUOTES is set.     &#39;<&#39; (less than) becomes &#39;&lt;&#39;     &#39;>&#39; (greater than) becomes &#39;&gt;&#39;

2、htmlspecialchars_decode（）将实体转成HTML代码,函数1的反函数。

3、htmlentities()

这个是全部转换html实体，和htmlspecialchars()区别在于，这个函数是转义全部的字符，而htmlspecialchars()仅仅转义上面限定的5个特殊字符！

4、html_entity_decode() 函数

把 HTML 实体转换为字符。

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