wp_image_add_srcset_and_sizes( string $image, array $image_meta, int $attachment_id ): string

1759function wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ) {1760	// Ensure the image meta exists.1761	if ( empty( $image_meta['sizes'] ) ) {1762		return $image;1763	}1764 1765	$image_src         = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';1766	list( $image_src ) = explode( '?', $image_src );1767 1768	// Return early if we couldn't get the image source.1769	if ( ! $image_src ) {1770		return $image;1771	}1772 1773	// Bail early if an image has been inserted and later edited.1774	if ( preg_match( '/-e[0-9]{13}/', $image_meta['file'], $img_edit_hash )1775		&& ! str_contains( wp_basename( $image_src ), $img_edit_hash[0] )1776	) {1777		return $image;1778	}1779 1780	$width  = preg_match( '/ width="([0-9]+)"/', $image, $match_width ) ? (int) $match_width[1] : 0;1781	$height = preg_match( '/ height="([0-9]+)"/', $image, $match_height ) ? (int) $match_height[1] : 0;1782 1783	if ( $width && $height ) {1784		$size_array = array( $width, $height );1785	} else {1786		$size_array = wp_image_src_get_dimensions( $image_src, $image_meta, $attachment_id );1787		if ( ! $size_array ) {1788			return $image;1789		}1790	}1791 1792	$srcset = wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );1793 1794	if ( $srcset ) {1795		// Check if there is already a 'sizes' attribute.1796		$sizes = strpos( $image, ' sizes=' );1797 1798		if ( ! $sizes ) {1799			$sizes = wp_calculate_image_sizes( $size_array, $image_src, $image_meta, $attachment_id );1800		}1801	}1802 1803	if ( $srcset && $sizes ) {1804		// Format the 'srcset' and 'sizes' string and escape attributes.1805		$attr = sprintf( ' srcset="%s"', esc_attr( $srcset ) );1806 1807		if ( is_string( $sizes ) ) {1808			$attr .= sprintf( ' sizes="%s"', esc_attr( $sizes ) );1809		}1810 1811		// Add the srcset and sizes attributes to the image markup.1812		return preg_replace( '/<img ([^>]+?)[\/ ]*>/', '<img $1' . $attr . ' />', $image );1813	}1814 1815	return $image;1816}