使用mb_convert_encoding()函數(shù)可將字符串在不同字符編碼間轉(zhuǎn)換，需確保PHP的Multibyte String擴(kuò)展已啟用。1. 該函數(shù)格式為mb_convert_encoding(字符串, 目標(biāo)編碼, 源編碼)，如將ISO-8859-1轉(zhuǎn)為UTF-8；2. 可結(jié)合mb_detect_encoding()檢測源編碼，但結(jié)果可能不準(zhǔn)確；3. 常用于將舊編碼數(shù)據(jù)轉(zhuǎn)為UTF-8以適配現(xiàn)代應(yīng)用；4. 替代方案iconv()支持//TRANSLIT和//IGNORE選項(xiàng)，但跨平臺一致性較差；5. 推薦優(yōu)先使用mb_convert_encoding()并確認(rèn)mbstring擴(kuò)展可用。

Converting a string from one character encoding to another in PHP is commonly done using the mb_convert_encoding() function. This function is part of PHP's Multibyte String extension, which must be enabled in your PHP installation.

Using mb_convert_encoding()

This is the most reliable way to convert character encodings when you know the current and target encodings.

Example: Convert a string from ISO-8859-1 (Latin-1) to UTF-8

$isoString = "Café";
$utf8String = mb_convert_encoding($isoString, 'UTF-8', 'ISO-8859-1');
echo $utf8String; // Outputs: Café in UTF-8

If the source encoding is not specified, PHP will try to detect it, but it's better to specify it explicitly for accuracy.

Detecting the Current Encoding

Before converting, you may need to detect the current encoding of a string:

$encoding = mb_detect_encoding($str, 'UTF-8, ISO-8859-1, ASCII', true);
if ($encoding) {
??$converted = mb_convert_encoding($str, 'UTF-8', $encoding);
}

Note: mb_detect_encoding() isn't 100% accurate, especially with short or ambiguous strings. Always validate input when possible.

Common Use Cases

• Convert legacy data (e.g., ISO-8859-1 or Windows-1252) to UTF-8 for modern web applications
• Prepare text for storage in a UTF-8 database
• Handle user-uploaded files with unknown encoding

Supported encodings include: UTF-8, UTF-16, ISO-8859-1, ASCII, EUC-JP, Shift_JIS, and many others — check mb_list_encodings() for full list.

Alternative: iconv()

PHP also provides the iconv() function, which can be used for encoding conversion:

$converted = iconv('ISO-8859-1', 'UTF-8//TRANSLIT', $str);

The //TRANSLIT option enables transliteration, replacing unsupported characters with similar ones. Use //IGNORE to skip invalid characters.

iconv() is sometimes faster but less consistent across platforms than mb_convert_encoding().

Basically use mb_convert_encoding() unless you have specific needs. Make sure the mbstring extension is available, as it's essential for proper multibyte handling.

以上是如何在 PHP 中將字符串從一種字符編碼轉(zhuǎn)換為另一種字符編碼的詳細(xì)內(nèi)容。更多信息請關(guān)注PHP中文網(wǎng)其他相關(guān)文章！