url_to_postid( string $url ): int

Source

function url_to_postid( $url ) {	global $wp_rewrite;	/** * Filters the URL to derive the post ID from. * * @since 2.2.0 * * @param string $url The URL to derive the post ID from. */	$url = apply_filters( 'url_to_postid', $url );	$url_host = parse_url( $url, PHP_URL_HOST );	if ( is_string( $url_host ) ) {	$url_host = str_replace( 'www.', '', $url_host );	} else {	$url_host = '';	}	$home_url_host = parse_url( home_url(), PHP_URL_HOST );	if ( is_string( $home_url_host ) ) {	$home_url_host = str_replace( 'www.', '', $home_url_host );	} else {	$home_url_host = '';	}	// Bail early if the URL does not belong to this site.	if ( $url_host && $url_host !== $home_url_host ) {	return 0;	}	// First, check to see if there is a 'p=N' or 'page_id=N' to match against.	if ( preg_match( '#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values ) ) {	$id = absint( $values[2] );	if ( $id ) {	return $id;	}	}	// Get rid of the #anchor.	$url_split = explode( '#', $url );	$url = $url_split[0];	// Get rid of URL ?query=string.	$url_split = explode( '?', $url );	$url = $url_split[0];	// Set the correct URL scheme.	$scheme = parse_url( home_url(), PHP_URL_SCHEME );	$url = set_url_scheme( $url, $scheme );	// Add 'www.' if it is absent and should be there.	if ( str_contains( home_url(), '://www.' ) && ! str_contains( $url, '://www.' ) ) {	$url = str_replace( '://', '://www.', $url );	}	// Strip 'www.' if it is present and shouldn't be.	if ( ! str_contains( home_url(), '://www.' ) ) {	$url = str_replace( '://www.', '://', $url );	}	if ( trim( $url, '/' ) === home_url() && 'page' === get_option( 'show_on_front' ) ) {	$page_on_front = get_option( 'page_on_front' );	if ( $page_on_front && get_post( $page_on_front ) instanceof WP_Post ) {	return (int) $page_on_front;	}	}	// Check to see if we are using rewrite rules.	$rewrite = $wp_rewrite->wp_rewrite_rules();	// Not using rewrite rules, and 'p=N' and 'page_id=N' methods failed, so we're out of options.	if ( empty( $rewrite ) ) {	return 0;	}	// Strip 'index.php/' if we're not using path info permalinks.	if ( ! $wp_rewrite->using_index_permalinks() ) {	$url = str_replace( $wp_rewrite->index . '/', '', $url );	}	if ( str_contains( trailingslashit( $url ), home_url( '/' ) ) ) {	// Chop off http://domain.com/[path].	$url = str_replace( home_url(), '', $url );	} else {	// Chop off /path/to/blog.	$home_path = parse_url( home_url( '/' ) );	$home_path = isset( $home_path['path'] ) ? $home_path['path'] : '';	$url = preg_replace( sprintf( '#^%s#', preg_quote( $home_path ) ), '', trailingslashit( $url ) );	}	// Trim leading and lagging slashes.	$url = trim( $url, '/' );	$request = $url;	$post_type_query_vars = array();	foreach ( get_post_types( array(), 'objects' ) as $post_type => $t ) {	if ( ! empty( $t->query_var ) ) {	$post_type_query_vars[ $t->query_var ] = $post_type;	}	}	// Look for matches.	$request_match = $request;	foreach ( (array) $rewrite as $match => $query ) {	/* * If the requesting file is the anchor of the match, * prepend it to the path info. */	if ( ! empty( $url ) && ( $url !== $request ) && str_starts_with( $match, $url ) ) {	$request_match = $url . '/' . $request;	}	if ( preg_match( "#^$match#", $request_match, $matches ) ) {	if ( $wp_rewrite->use_verbose_page_rules && preg_match( '/pagename=\$matches\[([0-9]+)\]/', $query, $varmatch ) ) {	// This is a verbose page match, let's check to be sure about it.	$page = get_page_by_path( $matches[ $varmatch[1] ] );	if ( ! $page ) {	continue;	}	$post_status_obj = get_post_status_object( $page->post_status );	if ( ! $post_status_obj->public && ! $post_status_obj->protected	&& ! $post_status_obj->private && $post_status_obj->exclude_from_search ) {	continue;	}	}	/* * Got a match. * Trim the query of everything up to the '?'. */	$query = preg_replace( '!^.+\?!', '', $query );	// Substitute the substring matches into the query.	$query = addslashes( WP_MatchesMapRegex::apply( $query, $matches ) );	// Filter out non-public query vars.	global $wp;	parse_str( $query, $query_vars );	$query = array();	foreach ( (array) $query_vars as $key => $value ) {	if ( in_array( (string) $key, $wp->public_query_vars, true ) ) {	$query[ $key ] = $value;	if ( isset( $post_type_query_vars[ $key ] ) ) {	$query['post_type'] = $post_type_query_vars[ $key ];	$query['name'] = $value;	}	}	}	// Resolve conflicts between posts with numeric slugs and date archive queries.	$query = wp_resolve_numeric_slug_conflicts( $query );	// Do the query.	$query = new WP_Query( $query );	if ( ! empty( $query->posts ) && $query->is_singular ) {	return $query->post->ID;	} else {	return 0;	}	}	}	return 0; } 

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