PHP special Character conversion entity function summary

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1. htmlspecialchars($string, $flag) (convert special characters to HTML entities converting special characters to HTML entities)

预定义的字符是：& （和号）成为 &" （双引号）成为 "' （单引号）成为 '< （小于）成为 <> （大于）成为 >

$flag defaults toENT_COMPAT | ENT_HTML401

constant Name	Description
Ent_compat	Convert double quotes without converting single quotes.
Ent_quotes	Both single and double quotation marks are converted.
Ent_noquotes	Both single and double quotation marks are not converted.
ent_html401	Processed as HTML 4.01 encoding.
Ent_xml1	Processed as XML 1 encoding.
Ent_xhtml	Processed as XHTML encoding.
Ent_html5	Processed as HTML 5 encoding.

Exp:

    $str = '"2015竞赛&"';    echo htmlspecialchars($str); //"2015竞赛&"quot;

2. htmlspecialchars_decode($string, $flag) (in contrast to the above, convert special HTML entities back to normal characters)

Exp

    $str  =  "
this -> "
\n" ;        echo htmlspecial_decode($str); // this -> "        /*不转换双引号*/    echo htmlspecial_decode($str, ENT_NOQUOTES); // this -> "

3. Htmlentities

`htmlentities($string, $flag)`这个函数与htmlspecialchars的区别网上教程说是也会转换中文，但是我本地php5.5测试两个效果一样

   $str='测试页面';    echo htmlentities($str);      $str='测试页面';    echo htmlspecialchars($str);

4. Html_entity_decode

是`htmlentities`的反函数  

5.nl2br

转换换行符(\n(unix), \r(Mac), \r\n(Win))为`
`

The above describes the PHP special character conversion entity function summary, including special characters, PHP content, I hope the PHP tutorial interested in a friend helpful.

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