(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
此函数自 PHP 8.2.0 起弃用。强烈建议不要应用此函数。
该函数将 string 字符串从 ISO-8859-1
编码转换为 UTF-8。
Note:
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-8859-1character encoding actually use the similarWindows-1252encoding, and web browsers will interpretISO-8859-1web pages asWindows-1252.Windows-1252features additional printable characters, such as the Euro sign (�) and curly quotes (""), instead of certainISO-8859-1control characters. This function will not convert suchWindows-1252characters correctly. Use a different function ifWindows-1252conversion is required.
stringISO-8859-1 字符串。
返回 string 的 UTF-8 翻译。
| 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. |
Example #1 基础示例
<?php
// Convert the string 'Zo?' 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
Note: 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"; // '?' (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"; // 'Zo?' 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