Sindbad~EG File Manager

<?php
namespace WPDRMS\ASL\Utils;

defined('ABSPATH') || die("You can't access this file directly.");

/**
 * Multibyte functions wrappers
 */
class MB {
	public static function strlen( ...$args ): int {
		if ( function_exists('mb_strlen') ) {
			return call_user_func_array('mb_strlen', $args);
		} else {
			return call_user_func_array('strlen', $args);
		}
	}

	public static function strpos( ...$args ) {
		if ( function_exists('mb_strpos') ) {
			return call_user_func_array('mb_strpos', $args);
		} else {
			return call_user_func_array('strpos', $args);
		}
	}

	public static function substr( ...$args ) {
		if ( function_exists('mb_substr') ) {
			return call_user_func_array('mb_substr', $args);
		} else {
			return call_user_func_array('substr', $args);
		}
	}

	public static function strtolower( ...$args ) {
		if ( function_exists('mb_strtolower') ) {
			return call_user_func_array('mb_strtolower', $args);
		} else {
			return call_user_func_array('strtolower', $args);
		}
	}

	public static function convert_case( ...$args ) {
		if ( function_exists('mb_convert_case') ) {
			return call_user_func_array('mb_convert_case', $args);
		} else {
			return $args[0] ?? '';
		}
	}

	public static function strrev( $string, $encoding = null ): string {
		if (
			function_exists('mb_detect_encoding') &&
			function_exists('mb_strlen') &&
			function_exists('mb_substr')
		) {
			if ( $encoding === null ) {
				$encoding = mb_detect_encoding($string);
			}

			$length   = mb_strlen($string, $encoding);
			$reversed = '';
			while ( $length-- > 0 ) {
				$reversed .= mb_substr($string, $length, 1, $encoding);
			}
			return $reversed;
		} else {
			return strrev($string);
		}
	}

	public static function trim( $string, $charlist = null ) {
		if ( is_null($charlist) ) {
			return trim($string);
		}

		$charlist = str_replace('/', '\/', preg_quote($charlist));
		return preg_replace("/(^[$charlist]+)|([$charlist]+$)/us", '', $string);
	}

	public static function strcasecmp( $str1, $str2, $encoding = null ): int {
		if ( !function_exists( 'mb_internal_encoding' ) ) {
			return strcmp(
				strtoupper(remove_accents($str1)),
				strtoupper(remove_accents($str2))
			);
		}
		if ( null === $encoding ) {
			$encoding = mb_internal_encoding();
		}
		return strcmp(
			mb_strtoupper(remove_accents($str1), $encoding),
			mb_strtoupper(remove_accents($str2), $encoding)
		);
	}
}