render_block_core_cover( array $attributes, string $content ): string

18function render_block_core_cover( $attributes, $content ) {19	// Handle embed video background.20	if (21		isset( $attributes['backgroundType'] ) &&22		'embed-video' === $attributes['backgroundType'] &&23		isset( $attributes['url'] ) &&24		! empty( $attributes['url'] ) &&25		is_string( $attributes['url'] )26	) {27		$url = $attributes['url'];28 29		// Use WordPress's native oEmbed processing (includes caching).30		$oembed_html = wp_oembed_get( $url );31 32		if ( $oembed_html ) {33			// Extract iframe src from the oEmbed HTML.34			preg_match( '/src=["\']([^"\']+)["\']/', $oembed_html, $src_matches );35			if ( ! empty( $src_matches[1] ) ) {36				$iframe_src = $src_matches[1];37 38				// Detect provider from iframe src URL.39				$lower_src = strtolower( $iframe_src );40				$provider  = null;41 42				if ( str_contains( $lower_src, 'youtube.com' ) || str_contains( $lower_src, 'youtu.be' ) ) {43					$provider = 'youtube';44				} elseif ( str_contains( $lower_src, 'vimeo.com' ) ) {45					$provider = 'vimeo';46				} elseif ( str_contains( $lower_src, 'videopress.com' ) ) {47					$provider = 'videopress';48				} elseif ( str_contains( $lower_src, 'wordpress.tv' ) ) {49					$provider = 'wordpress-tv';50				}51 52				// Modify iframe src to add background video parameters based on provider.53				$parsed_url = wp_parse_url( $iframe_src );54				if ( $parsed_url && isset( $parsed_url['host'] ) ) {55					// Parse existing query parameters.56					$query_params = array();57					if ( isset( $parsed_url['query'] ) ) {58						parse_str( $parsed_url['query'], $query_params );59					}60 61					// Add background video parameters based on provider.62					if ( 'youtube' === $provider ) {63						$query_params['autoplay']       = '1';64						$query_params['mute']           = '1';65						$query_params['loop']           = '1';66						$query_params['controls']       = '0';67						$query_params['modestbranding'] = '1';68						$query_params['playsinline']    = '1';69 70						// For loop to work, we need the playlist parameter.71						$path          = $parsed_url['path'] ?? '';72						$path_segments = explode( '/', $path );73						$video_id      = end( $path_segments );74						if ( $video_id ) {75								$query_params['playlist'] = $video_id;76						}77					} elseif ( 'vimeo' === $provider ) {78						$query_params['autoplay']    = '1';79						$query_params['muted']       = '1';80						$query_params['loop']        = '1';81						$query_params['background']  = '1';82						$query_params['controls']    = '0';83						$query_params['transparent'] = '0';84					} elseif ( 'videopress' === $provider || 'wordpress-tv' === $provider ) {85						$query_params['autoplay'] = '1';86						$query_params['loop']     = '1';87						$query_params['muted']    = '1';88					}89 90					// Rebuild the URL with new parameters.91					$iframe_src = $parsed_url['scheme'] . '://' . $parsed_url['host'];92					if ( isset( $parsed_url['path'] ) ) {93						$iframe_src .= $parsed_url['path'];94					}95					if ( ! empty( $query_params ) ) {96						$iframe_src .= '?' . http_build_query( $query_params );97					}