utf8_encode

    (PHP 4, PHP 5, PHP 7, PHP 8)

    utf8_encode — 将字符串从 ISO-8859-1 转换为 UTF-8 编码

    警告

    此函数自 PHP 8.2.0 起弃用。强烈建议不要应用此函数。

    说明

    utf8_encode(string$string): string

    该函数将 string 字符串从 ISO-8859-1 编码转换为 UTF-8。

    注意:

    This function does not attempt to guess the current encoding of the provided string, it assumes it is encoded as ISO-8859-1 (also known as "Latin 1") and converts to UTF-8. Since every sequence of bytes is a valid ISO-8859-1 string, this never results in an error, but will not result in a useful string if a different encoding was intended.

    Many web pages marked as using the ISO-8859-1 character encoding actually use the similar Windows-1252 encoding, and web browsers will interpret ISO-8859-1 web pages as Windows-1252. Windows-1252 features additional printable characters, such as the Euro sign (€) and curly quotes (“”), instead of certain ISO-8859-1 control characters. This function will not convert such Windows-1252 characters correctly. Use a different function if Windows-1252 conversion is required.

    参数

    string

    ISO-8859-1 字符串。

    返回值

    返回 string 的 UTF-8 翻译。

    更新日志

    版本说明
    8.2.0 弃用此函数。
    7.2.0 This function has been moved from the XML extension to the core of PHP. In previous versions, it was only available if the XML extension was installed.

    示例

    示例 #1 基础示例

    <?php
    // Convert the string 'Zoë' from ISO 8859-1 to UTF-8
    $iso8859_1_string = "\x5A\x6F\xEB";
    $utf8_string = utf8_encode($iso8859_1_string);
    echo     bin2hex($utf8_string), "\n";
    ?>

    以上示例会输出：

    5a6fc3ab

    注释

    注意: 弃用和替代方案

    从 PHP 8.2.0 开始，弃用此函数，并将在未来的版本中删除。应检查现有用途并用适当的替代方案。

    类似的功能可以通过 mb_convert_encoding() 实现，支持 ISO-8859-1 和许多其他字符编码。

    <?php
    $iso8859_1_string     = "\xEB"; // 'ë' (e with diaeresis) in ISO-8859-1
    $utf8_string = mb_convert_encoding($iso8859_1_string, 'UTF-8', 'ISO-8859-1');
    echo     bin2hex($utf8_string), "\n";

    $iso8859_7_string = "\xEB"; // the same string in ISO-8859-7 represents 'λ' (Greek lower-case lambda)
    $utf8_string = mb_convert_encoding($iso8859_7_string, 'UTF-8', 'ISO-8859-7');
    echo     bin2hex($utf8_string), "\n";

    $windows_1252_string = "\x80"; // '€' (Euro sign) in Windows-1252, but not in ISO-8859-1
    $utf8_string = mb_convert_encoding($windows_1252_string, 'UTF-8', 'Windows-1252');
    echo     bin2hex($utf8_string), "\n";
    ?>

    以上示例会输出：

    c3ab cebb e282ac

    根据安装的扩展，其他有效选项是 UConverter::transcode() 和 iconv()。

    以下都给出相同的结果：

    <?php
    $iso8859_1_string     = "\x5A\x6F\xEB"; // 'Zoë' in ISO-8859-1

    $utf8_string = utf8_encode($iso8859_1_string);
    echo     bin2hex($utf8_string), "\n";

    $utf8_string = mb_convert_encoding($iso8859_1_string, 'UTF-8', 'ISO-8859-1');
    echo     bin2hex($utf8_string), "\n";

    $utf8_string = UConverter::transcode($iso8859_1_string, 'UTF8', 'ISO-8859-1');
    echo     bin2hex($utf8_string), "\n";

    $utf8_string = iconv('ISO-8859-1', 'UTF-8', $iso8859_1_string);
    echo     bin2hex($utf8_string), "\n";
    ?>

    以上示例会输出：

    5a6fc3ab 5a6fc3ab 5a6fc3ab 5a6fc3ab

    参见

    • utf8_decode() - 将字符串从 UTF-8 转换为 ISO-8859-1，替换无效或者无法表示的字符。
    • mb_convert_encoding() - 转换字符串，从一个字符编码到另一个字符编码
    • UConverter::transcode() - Convert a string from one character encoding to another
    • iconv() - 将字符串从一个字符编码转换到另一个字符编码
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