(PHP 4, PHP 5)
htmlentities — Convert all applicable characters to HTML entities
This function is identical to htmlspecialchars() in all ways, except with htmlentities(), all characters which have HTML character entity equivalents are translated into these entities.
If you're wanting to decode instead (the reverse) you can use html_entity_decode().
The input string.
Like htmlspecialchars(), the optional second quote_style parameter lets you define what will be done with 'single' and "double" quotes. It takes on one of three constants with the default being ENT_COMPAT:
| Constant Name | Description |
|---|---|
| ENT_COMPAT | Will convert double-quotes and leave single-quotes alone. |
| ENT_QUOTES | Will convert both double and single quotes. |
| ENT_NOQUOTES | Will leave both double and single quotes unconverted. |
Like htmlspecialchars(), it takes an optional third argument charset which defines character set used in conversion. Presently, the ISO-8859-1 character set is used as the default.
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.
Returns the encoded string.
| 版本 | 说明 |
|---|---|
| 5.2.3 | The double_encode parameter was added. |
| 4.1.0 | The charset parameter was added. |
| 4.0.3 | The quote_style parameter was added. |
Example#1 A htmlentities() example
<?php
$str = "A 'quote' is <b>bold</b>";
// Outputs: A 'quote' is <b>bold</b>
echo htmlentities($str);
// Outputs: A 'quote' is <b>bold</b>
echo htmlentities($str, ENT_QUOTES);
?>