wp_calculate_image_sizes( string|int[] $size, string|null $image_src = null, array|null $image_meta = null, int $attachment_id = 0 ): string|false

1570function wp_calculate_image_sizes( $size, $image_src = null, $image_meta = null, $attachment_id = 0 ) {1571	$width = 0;1572 1573	if ( is_array( $size ) ) {1574		$width = absint( $size[0] );1575	} elseif ( is_string( $size ) ) {1576		if ( ! $image_meta && $attachment_id ) {1577			$image_meta = wp_get_attachment_metadata( $attachment_id );1578		}1579 1580		if ( is_array( $image_meta ) ) {1581			$size_array = _wp_get_image_size_from_meta( $size, $image_meta );1582			if ( $size_array ) {1583				$width = absint( $size_array[0] );1584			}1585		}1586	}1587 1588	if ( ! $width ) {1589		return false;1590	}1591 1592	// Setup the default 'sizes' attribute.1593	$sizes = sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $width );1594 1595	/**1596	 * Filters the output of 'wp_calculate_image_sizes()'.1597	 *1598	 * @since 4.4.01599	 *1600	 * @param string       $sizes         A source size value for use in a 'sizes' attribute.1601	 * @param string|int[] $size          Requested image size. Can be any registered image size name, or1602	 *                                    an array of width and height values in pixels (in that order).1603	 * @param string|null  $image_src     The URL to the image file or null.1604	 * @param array|null   $image_meta    The image meta data as returned by wp_get_attachment_metadata() or null.1605	 * @param int          $attachment_id Image attachment ID of the original image or 0.1606	 */1607	return apply_filters( 'wp_calculate_image_sizes', $sizes, $size, $image_src, $image_meta, $attachment_id );1608}