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Edit File: tab-panel.php

<?php /** * Tab Panel Block * * @package WordPress */ /** * Render callback for core/tab-panel. * * @since 7.1.0 * * @param array $attributes Block attributes. * @param string $content Block content. * @param \WP_Block $block Block instance. * * @return string Updated HTML. */ function block_core_tab_panel_render( array $attributes, string $content, \WP_Block $block ): string { $tabs_id = $block->context['core/tabs-id'] ?? ''; static $tab_counters = array(); if ( ! isset( $tab_counters[ $tabs_id ] ) ) { $tab_counters[ $tabs_id ] = 0; } $tab_index = $tab_counters[ $tabs_id ]; ++$tab_counters[ $tabs_id ]; $tag_processor = new WP_HTML_Tag_Processor( $content ); $tag_processor->next_tag( array( 'class_name' => 'wp-block-tab-panel' ) ); // Use the user's custom anchor if present, otherwise fall back to // the generated position-based ID. $tab_id = (string) $tag_processor->get_attribute( 'id' ); if ( empty( $tab_id ) ) { $tab_id = ! empty( $tabs_id ) ? $tabs_id . '-tab-' . $tab_index : 'tab-' . $tab_index; $tag_processor->set_attribute( 'id', $tab_id ); } $tag_processor->set_attribute( 'aria-labelledby', 'tab__' . $tab_id ); $tag_processor->set_attribute( 'data-wp-bind--hidden', '!state.isActiveTab' ); return (string) $tag_processor->get_updated_html(); } /** * Registers the `core/tab-panel` block on the server. * * @hook init * * @since 7.1.0 */ function register_block_core_tab_panel() { register_block_type_from_metadata( __DIR__ . '/tab-panel', array( 'render_callback' => 'block_core_tab_panel_render', ) ); } add_action( 'init', 'register_block_core_tab_panel' );