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PHP's function htmlentities() that converts strings into html entities
PHP's function htmlentities() that converts strings into html entities
实例
把一些字符转换为 HTML 实体：
<?php $str = "<© W3CSçh°°¦§>"; echo htmlentities($str); ?>
上面代码的 HTML 输出如下（查看源代码）：
<!DOCTYPE html> <html> <body> <© W3CSçh°°¦§> </body> </html>
上面代码的浏览器输出如下：
<© W3CSçh°°¦§>
定义和用法
htmlentities() 函数把字符转换为 HTML 实体。
提示：要把 HTML 实体转换回字符，请使用 html_entity_decode() 函数。
提示：请使用 get_html_translation_table() 函数来返回 htmlentities() 使用的翻译表。
语法
htmlentities(string,flags,character-set,double_encode)
| 参数 | 描述 |
| string | 必需。规定要转换的字符串。 |
| flags | 可选。规定如何处理引号、无效的编码以及使用哪种文档类型。 可用的引号类型：
无效的编码：
规定使用的文档类型的附加 flags：
|
| character-set | 可选。一个规定了要使用的字符集的字符串。 允许的值：
注释：在 PHP 5.4 之前的版本，无法被识别的字符集将被忽略并由 ISO-8859-1 替代。自 PHP 5.4 起，无法被识别的字符集将被忽略并由 UTF-8 替代。 |
| double_encode | 可选。一个规定了是否编码已存在的 HTML 实体的布尔值。
|
技术细节
| 返回值： | 返回已转换的字符串。 如果 string 包含无效的编码，则返回一个空的字符串，除非设置了 ENT_IGNORE 或者 ENT_SUBSTITUTE 标志。 |
| PHP 版本： | 4+ |
| 更新日志： | 在 PHP 5 中，character-set 参数的默认值改为 UTF-8。 在 PHP 5.4 中，新增了：ENT_SUBSTITUTE、ENT_DISALLOWED、ENT_HTML401、ENT_HTML5、ENT_XML1 和 ENT_XHTML。 在 PHP 5.3 中，新增了 ENT_IGNORE。 在 PHP 5.2.3 中，新增了 double_encode 参数。 在 PHP 4.1 中，新增了 character-set 参数。 |
更多实例
实例 1
把一些字符转换为 HTML 实体：
<?php $str = "Jane & 'Tarzan'"; echo htmlentities($str, ENT_COMPAT); // Will only convert double quotes echo "<br>"; echo htmlentities($str, ENT_QUOTES); // Converts double and single quotes echo "<br>"; echo htmlentities($str, ENT_NOQUOTES); // Does not convert any quotes ?>
上面代码的 HTML 输出如下（查看源代码）：
<!DOCTYPE html> <html> <body> Jane & 'Tarzan'<br> Jane & 'Tarzan'<br> Jane & 'Tarzan' </body> </html>
上面代码的浏览器输出如下：
Jane & 'Tarzan' Jane & 'Tarzan' Jane & 'Tarzan'
实例 2
通过使用西欧字符集，把一些字符转换为 HTML 实体：
<?php $str = "My name is Øyvind Åsane. I'm Norwegian."; echo htmlentities($str, ENT_QUOTES, "ISO-8859-1"); // Will only convert double quotes (not single quotes), and uses the character-set Western European ?>
上面代码的 HTML 输出如下（查看源代码）：
<!DOCTYPE html> <html> <body> My name is Øyvind Åsane. I'm Norwegian. </body> </html>
上面代码的浏览器输出如下：
My name is Øyvind Åsane. I'm Norwegian.
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