<?php

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/**

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* Appending the wp-block-heading to before rendering the stored `core/heading` block contents.

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*

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* @package WordPress

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*/

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/**

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* Adds a wp-block-heading class to the heading block content.

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*

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* For example, the following block content:

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* <h2 class="align-left">Hello World</h2>

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*

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* Would be transformed to:

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* <h2 class="align-left wp-block-heading">Hello World</h2>

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*

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* @since 6.2.0

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*

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* @param array $attributes Attributes of the block being rendered.

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* @param string $content Content of the block being rendered.

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*

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* @return string The content of the block being rendered.

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*/

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function block_core_heading_render( $attributes, $content ) {

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if ( ! $content ) {

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return $content;

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}

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$p = new WP_HTML_Tag_Processor( $content );

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$header_tags = array( 'H1', 'H2', 'H3', 'H4', 'H5', 'H6' );

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while ( $p->next_tag() ) {

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if ( in_array( $p->get_tag(), $header_tags, true ) ) {

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$p->add_class( 'wp-block-heading' );

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break;

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}

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}

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return $p->get_updated_html();

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}

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/**

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* Registers the `core/heading` block on server.

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*

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* @since 6.2.0

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*/

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function register_block_core_heading() {

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register_block_type_from_metadata(

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__DIR__ . '/heading',

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array(

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'render_callback' => 'block_core_heading_render',

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)

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);

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}

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add_action( 'init', 'register_block_core_heading' );

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