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✏️ Editing: UtfString.php

<?php

namespace Mpdf\Utils;

class UtfString
{

/**
	 * Converts all the &#nnn; and &#xhhh; in a string to Unicode
	 *
	 * @since mPDF 5.7
	 * @param string $str
	 * @param bool $lo
	 *
	 * @return string
	 */
	public static function strcode2utf($str, $lo = true)
	{
		$str = preg_replace_callback('/\&\#(\d+)\;/m', function ($matches) use ($lo) {
			return static::code2utf($matches[1], $lo ? 1 : 0);
		}, $str);
		$str = preg_replace_callback('/\&\#x([0-9a-fA-F]+)\;/m', function ($matches) use ($lo) {
			return static::codeHex2utf($matches[1], $lo ? 1 : 0);
		}, $str);

return $str;
	}

/**
	 * @param int $num
	 * @param bool $lo
	 *
	 * @return string
	 */
	public static function code2utf($num, $lo = true)
	{
		// Returns the utf string corresponding to the unicode value
		if ($num < 128) {
			return $lo
				? chr($num)
				: '&#' . $num . ';';
		}

if ($num < 2048) {
			return chr(($num >> 6) + 192) . chr(($num & 63) + 128);
		}

if ($num < 65536) {
			return chr(($num >> 12) + 224) . chr((($num >> 6) & 63) + 128) . chr(($num & 63) + 128);
		}

if ($num < 2097152) {
			return chr(($num >> 18) + 240) . chr((($num >> 12) & 63) + 128) . chr((($num >> 6) & 63) + 128) . chr(($num & 63) + 128);
		}

return '?';
	}

public static function codeHex2utf($hex, $lo = true)
	{
		$num = hexdec($hex);
		if (($num < 128) && !$lo) {
			return '&#x' . $hex . ';';
		}

return static::code2utf($num, $lo);
	}

}

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