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

18function render_block_core_button( $attributes, $content ) {19	$p = new WP_HTML_Tag_Processor( $content );20 21	/*22	 * The button block can render an `<a>` or `<button>` and also has a23	 * `<div>` wrapper. Find the a or button tag.24	 */25	$tag = null;26	while ( $p->next_tag() ) {27		$tag = $p->get_tag();28		if ( 'A' === $tag || 'BUTTON' === $tag ) {29			break;30		}31	}32 33	/*34	 * If this happens, the likelihood is there's no block content,35	 * or the block has been modified by a plugin.36	 */37	if ( null === $tag ) {38		return $content;39	}40 41	// If the next token is the closing tag, the button is empty.42	$is_empty = true;43	while ( $p->next_token() && $tag !== $p->get_token_name() && $is_empty ) {44		if ( '#comment' !== $p->get_token_type() ) {45			/**46			 * Anything else implies this is not empty.47			 * This might include any text content (including a space),48			 * inline images or other HTML.49			 */50			$is_empty = false;51		}52	}53 54	/*55	 * When there's no text, render nothing for the block.56	 * See https://github.com/WordPress/gutenberg/issues/17221 for the57	 * reasoning behind this.58	 */59	if ( $is_empty ) {60		return '';61	}62 63	$width = $attributes['style']['dimensions']['width'] ?? null;64 65	if ( $width ) {66		// Resolve preset references to their actual values.67		$resolved_width = $width;68		$is_preset      = str_starts_with( $width, 'var:preset|dimension|' );69 70		if ( $is_preset ) {71			$slug              = substr( $width, strlen( 'var:preset|dimension|' ) );72			$dimension_presets = wp_get_global_settings(73				array( 'dimensions', 'dimensionSizes' ),74				array( 'block_name' => 'core/button' )75			);76 77			// Search origins in priority order: custom > theme > default.78			if ( is_array( $dimension_presets ) ) {79				foreach ( array( 'custom', 'theme', 'default' ) as $origin ) {80					if ( empty( $dimension_presets[ $origin ] ) || ! is_array( $dimension_presets[ $origin ] ) ) {81						continue;82					}83					foreach ( $dimension_presets[ $origin ] as $preset ) {84						if ( isset( $preset['slug'] ) && $preset['slug'] === $slug ) {85							$resolved_width = $preset['size'] ?? $width;86							break 2;87						}88					}89				}90			}91		}92 93		$is_percentage = str_ends_with( $resolved_width, '%' );94 95		$processor = new WP_HTML_Tag_Processor( $content );96		// Target the outer wrapper div.97		if ( $processor->next_tag( array( 'class_name' => 'wp-block-button' ) ) ) {