自 PHP 5.4.0 起,mbstring 支持现在默认启用(但未加载)。加载扩展程序,这可以让您执行以下操作:
<? //PHP 5.4+
$ensureIsUTF8 = static function($data){
$dataEncoding = \mb_detect_encoding(
$data,
['UTF-8', 'windows-1251', 'iso-8859-1', /*others you encounter*/],
true
);
//UTF-16/32 encoding detection always fails for PHP <= 5.4.1
//Use detection code copied from PHP docs comments:
//http://www.php.net/manual/en/function.mb-detect-encoding.php
if ($dataEncoding === false){
$UTF32_BIG_ENDIAN_BOM = chr(0x00) . chr(0x00) . chr(0xFE) . chr(0xFF);
$UTF32_LITTLE_ENDIAN_BOM = chr(0xFF) . chr(0xFE) . chr(0x00) . chr(0x00);
$UTF16_BIG_ENDIAN_BOM = chr(0xFE) . chr(0xFF);
$UTF16_LITTLE_ENDIAN_BOM = chr(0xFF) . chr(0xFE);
$first2 = \substr($data, 0, 2);
$first4 = \substr($data, 0, 4);
if ($first4 === $UTF32_BIG_ENDIAN_BOM) {
$dataEncoding = 'UTF-32BE';
} elseif ($first4 === $UTF32_LITTLE_ENDIAN_BOM) {
$dataEncoding = 'UTF-32LE';
} elseif ($first2 === $UTF16_BIG_ENDIAN_BOM) {
$dataEncoding = 'UTF-16BE';
} elseif ($first2 === $UTF16_LITTLE_ENDIAN_BOM) {
$dataEncoding = 'UTF-16LE';
} else {
throw new \Exception('Whoa! No idea what that was.');
}
}
if ($dataEncoding === 'UTF-8'){
return $data;
} else {
return \mb_convert_encoding(
$data,
'UTF-8',
$dataEncoding
);
}
};
$utf8Data = $ensureIsUTF8(\file_get_contents('something'));
$utf8Data = $ensureIsUTF8(\file_get_contents('http://somethingElse'));
$utf8Data = $ensureIsUTF8($userProvidedData);
?>