WP_Translation_File_MO::detect_endian_and_validate_file( string $header ): false|'V'|'N'

44	protected function detect_endian_and_validate_file( string $header ) {45		$big = unpack( 'N', $header );46 47		if ( false === $big ) {48			return false;49		}50 51		$big = reset( $big );52 53		if ( false === $big ) {54			return false;55		}56 57		$little = unpack( 'V', $header );58 59		if ( false === $little ) {60			return false;61		}62 63		$little = reset( $little );64 65		if ( false === $little ) {66			return false;67		}68 69		// Force cast to an integer as it can be a float on x86 systems. See https://core.trac.wordpress.org/ticket/60678.70		if ( (int) self::MAGIC_MARKER === $big ) {71			return 'N';72		}73 74		// Force cast to an integer as it can be a float on x86 systems. See https://core.trac.wordpress.org/ticket/60678.75		if ( (int) self::MAGIC_MARKER === $little ) {76			return 'V';77		}78 79		$this->error = 'Magic marker does not exist';80		return false;81	}