size_format( int|string $bytes, int $decimals = 0 ): string|false

468function size_format( $bytes, $decimals = 0 ) {469	$quant = array(470		/* translators: Unit symbol for yottabyte. */471		_x( 'YB', 'unit symbol' ) => YB_IN_BYTES,472		/* translators: Unit symbol for zettabyte. */473		_x( 'ZB', 'unit symbol' ) => ZB_IN_BYTES,474		/* translators: Unit symbol for exabyte. */475		_x( 'EB', 'unit symbol' ) => EB_IN_BYTES,476		/* translators: Unit symbol for petabyte. */477		_x( 'PB', 'unit symbol' ) => PB_IN_BYTES,478		/* translators: Unit symbol for terabyte. */479		_x( 'TB', 'unit symbol' ) => TB_IN_BYTES,480		/* translators: Unit symbol for gigabyte. */481		_x( 'GB', 'unit symbol' ) => GB_IN_BYTES,482		/* translators: Unit symbol for megabyte. */483		_x( 'MB', 'unit symbol' ) => MB_IN_BYTES,484		/* translators: Unit symbol for kilobyte. */485		_x( 'KB', 'unit symbol' ) => KB_IN_BYTES,486		/* translators: Unit symbol for byte. */487		_x( 'B', 'unit symbol' )  => 1,488	);489 490	if ( 0 === $bytes ) {491		/* translators: Unit symbol for byte. */492		return number_format_i18n( 0, $decimals ) . ' ' . _x( 'B', 'unit symbol' );493	}494 495	foreach ( $quant as $unit => $mag ) {496		if ( (float) $bytes >= $mag ) {497			return number_format_i18n( $bytes / $mag, $decimals ) . ' ' . $unit;498		}499	}500 501	return false;502}