php htmlentities()函数的定义和用法,phphtmlentities
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:
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。布尔值,规定是否编码已存在的 HTML 实体。
|
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:
1 2 3 4 5 6 7 8 |
|
以上代码的 HTML 输出如下(查看源代码):
1 2 3 4 5 6 7 8 |
|
以上代码的浏览器输出:
1 2 3 |
|
例子 2
通过使用西欧字符集,把一些字符转换为 HTML 实体:
1 2 3 4 5 |
|
以上代码的 HTML 输出如下(查看源代码):
1 2 3 4 5 6 |
|
以上代码的浏览器输出:
My name is ?yvind ?sane. I'm Norwegian.
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