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php htmlentities()函数的定义和用法,phphtmlentities
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php htmlentities()函数的定义和用法,phphtmlentities

Jun 13, 2016 am 08:39 AM
htmlentities php function

php htmlentities()函数的定义和用法,phphtmlentities

php htmlentities() 函数把字符转换为 HTML 实体,本文章向码农介绍php htmlentities() 函数基本使用方法和实例介绍,需要的码农可以参考一下。

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:

  • ENT_COMPAT - 默认。仅编码双引号。
  • ENT_QUOTES - 编码双引号和单引号。
  • ENT_NOQUOTES - 不编码任何引号。

无效的编码:

  • ENT_IGNORE - 忽略无效的编码,而不是让函数返回一个空的字符串。应尽量避免,因为这可能对安全性有影响。
  • ENT_SUBSTITUTE - 把无效的编码替代成一个指定的带有 Unicode 替代字符 U+FFFD(UTF-8)或者 FFFD; 的字符,而不是返回一个空的字符串。
  • ENT_DISALLOWED - 把指定文档类型中的无效代码点替代成 Unicode 替代字符 U+FFFD(UTF-8)或者 FFFD;。

规定使用的文档类型的附加 flags:

  • ENT_HTML401 - 默认。作为 HTML 4.01 处理代码。
  • ENT_HTML5 - 作为 HTML 5 处理代码。
  • ENT_XML1 - 作为 XML 1 处理代码。
  • ENT_XHTML - 作为 XHTML 处理代码。
character-set

可选。一个规定了要使用的字符集的字符串。

允许的值:

  • UTF-8 - 默认。ASCII 兼容多字节的 8 位 Unicode
  • ISO-8859-1 - 西欧
  • ISO-8859-15 - 西欧(加入欧元符号 + ISO-8859-1 中丢失的法语和芬兰语字母)
  • cp866 - DOS 专用 Cyrillic 字符集
  • cp1251 - Windows 专用 Cyrillic 字符集
  • cp1252 - Windows 专用西欧字符集
  • KOI8-R - 俄语
  • BIG5 - 繁体中文,主要在台湾使用
  • GB2312 - 简体中文,国家标准字符集
  • BIG5-HKSCS - 带香港扩展的 Big5
  • Shift_JIS - 日语
  • EUC-JP - 日语
  • MacRoman - Mac 操作系统使用的字符集

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。布尔值,规定是否编码已存在的 HTML 实体。

  • TRUE - 默认。将对每个实体进行转换。
  • FALSE - 不会对已存在的 HTML 实体进行编码。

 

技术细节

返回值:

返回被转换的字符串。

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。

 实例例子 1

把字符转换为 HTML 实体:

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<&#63;php

$str = "Bill & 'Steve'";

echo htmlentities($str, ENT_COMPAT); // 只转换双引号

echo "<br>";

echo htmlentities($str, ENT_QUOTES); // 转换双引号和单引号

echo "<br>";

echo htmlentities($str, ENT_NOQUOTES); // 不转换任何引号

&#63;>

Copy after login

以上代码的 HTML 输出如下(查看源代码):

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<!DOCTYPE html>

<html>

<body>

Bill & 'Steve'<br>

Bill & 'Tarzan'<br>

Bill & 'Steve'

</body>

</html>

Copy after login

以上代码的浏览器输出:

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Bill & 'Steve'

Bill & 'Steve'

Bill & 'Steve'

Copy after login

例子 2

通过使用西欧字符集,把一些字符转换为 HTML 实体:

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<&#63;php

$str = "My name is &#63;yvind &#63;sane. 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

&#63;>

Copy after login

以上代码的 HTML 输出如下(查看源代码):

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<!DOCTYPE html>

<html>

<body>

My name is &Oslash;yvind &Aring;sane. I'm Norwegian.

</body>

</html>

Copy after login

以上代码的浏览器输出:

My name is ?yvind ?sane. I'm Norwegian.

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