mirror of
https://github.com/koel/koel
synced 2024-11-24 05:03:05 +00:00
36 lines
1.2 KiB
PHP
36 lines
1.2 KiB
PHP
<?php
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namespace App\Services;
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class Util
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{
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public function __construct()
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{
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defined('UTF8_BOM') || define('UTF8_BOM', chr(0xEF) . chr(0xBB) . chr(0xBF));
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defined('UTF16_LITTLE_ENDIAN_BOM') || define('UTF16_LITTLE_ENDIAN_BOM', chr(0xFF) . chr(0xFE));
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defined('UTF16_BIG_ENDIAN_BOM') || define('UTF16_BIG_ENDIAN_BOM', chr(0xFE) . chr(0xFF));
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defined('UTF32_LITTLE_ENDIAN_BOM') || define('UTF32_LITTLE_ENDIAN_BOM', chr(0xFF) . chr(0xFE) . chr(0x00) . chr(0x00)); // @phpcs-ignore-line
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defined('UTF32_BIG_ENDIAN_BOM') || define('UTF32_BIG_ENDIAN_BOM', chr(0x00) . chr(0x00) . chr(0xFE) . chr(0xFF)); // @phpcs-ignore-line
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}
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public function detectUTFEncoding(?string $str): ?string
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{
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switch (substr($str, 0, 2)) {
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case UTF16_BIG_ENDIAN_BOM:
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return 'UTF-16BE';
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case UTF16_LITTLE_ENDIAN_BOM:
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return 'UTF-16LE';
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}
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if (substr($str, 0, 3) === UTF8_BOM) {
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return 'UTF-8';
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}
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return match (substr($str, 0, 4)) {
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UTF32_BIG_ENDIAN_BOM => 'UTF-32BE',
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UTF32_LITTLE_ENDIAN_BOM => 'UTF-32LE',
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default => null,
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};
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}
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}
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