(PHP 4, PHP 5)
htmlspecialchars — Convert special characters to HTML entities
Certain characters have special significance in HTML, and should be represented by HTML entities if they are to preserve their meanings. This function returns a string with some of these conversions made; the translations made are those most useful for everyday web programming. If you require all HTML character entities to be translated, use htmlentities() instead.
This function is useful in preventing user-supplied text from containing HTML markup, such as in a message board or guest book application.
The translations performed are:
The string being converted.
The optional second argument, quote_style , tells the function what to do with single and double quote characters. The default mode, ENT_COMPAT, is the backwards compatible mode which only translates the double-quote character and leaves the single-quote untranslated. If ENT_QUOTES is set, both single and double quotes are translated and if ENT_NOQUOTES is set neither single nor double quotes are translated.
Defines character set used in conversion. The default character set is ISO-8859-1.
PHP 4.3.0 及其后续版本支持如下字符集。
| 字符集 | 别名 | 描述 |
|---|---|---|
| ISO-8859-1 | ISO8859-1 | 西欧，Latin-1 |
| ISO-8859-15 | ISO8859-15 | 西欧，Latin-9。增加了 Latin-1（ISO-8859-1）中缺少的欧元符号、法国及芬兰字母。 |
| UTF-8 | ASCII 兼容多字节 8-bit Unicode。 | |
| cp866 | ibm866, 866 | DOS-特有的 Cyrillic 字母字符集。PHP 4.3.2 开始支持该字符集。 |
| cp1251 | Windows-1251, win-1251, 1251 | Windows-特有的 Cyrillic 字母字符集。PHP 4.3.2 开始支持该字符集。 |
| cp1252 | Windows-1252, 1252 | Windows 对于西欧特有的字符集。 |
| KOI8-R | koi8-ru, koi8r | 俄文。PHP 4.3.2 开始支持该字符集。 |
| BIG5 | 950 | 繁体中文，主要用于中国台湾。 |
| GB2312 | 936 | 简体中文，国际标准字符集。 |
| BIG5-HKSCS | 繁体中文，Big5 的延伸，主要用于香港。 | |
| Shift_JIS | SJIS, 932 | 日文。 |
| EUC-JP | EUCJP | 日文。 |
Note: ISO-8859-1 将代替任何其它无法识别的字符集。
When double_encode is turned off PHP will not encode existing html entities, the default is to convert everything.
The converted string.
| 版本 | 说明 |
|---|---|
| 5.2.3 | The double_encode parameter was added. |
| 4.1.0 | The charset parameter was added. |
Example #1 htmlspecialchars() example
<?php
$new = htmlspecialchars("<a href='test'>Test</a>", ENT_QUOTES);
echo $new; // <a href='test'>Test</a>
?>
Note: Note that this function does not translate anything beyond what is listed above. For full entity translation, see htmlentities().