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EDIT: footnotes.php

<?php
/**
 * Server-side rendering of the `core/footnotes` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/footnotes` block on the server.
 *
 * @since 6.3.0
 *
 * @param array    $attributes Block attributes.
 * @param string   $content    Block default content.
 * @param WP_Block $block      Block instance.
 *
 * @return string Returns the HTML representing the footnotes.
 */
function render_block_core_footnotes( $attributes, $content, $block ) {
	// Bail out early if the post ID is not set for some reason.
	if ( empty( $block->context['postId'] ) ) {
		return '';
	}

if ( post_password_required( $block->context['postId'] ) ) {
		return;
	}

$footnotes = get_post_meta( $block->context['postId'], 'footnotes', true );

if ( ! $footnotes ) {
		return;
	}

$footnotes = json_decode( $footnotes, true );

if ( ! is_array( $footnotes ) || count( $footnotes ) === 0 ) {
		return '';
	}

$wrapper_attributes = get_block_wrapper_attributes();
	$footnote_index     = 1;

$block_content = '';

foreach ( $footnotes as $footnote ) {
		// Translators: %d: Integer representing the number of return links on the page.
		$aria_label     = sprintf( __( 'Jump to footnote reference %1$d' ), $footnote_index );
		$block_content .= sprintf(
			'<li id="%1$s">%2$s <a href="#%1$s-link" aria-label="%3$s">↩︎</a></li>',
			$footnote['id'],
			$footnote['content'],
			$aria_label
		);
		++$footnote_index;
	}

return sprintf(
		'<ol %1$s>%2$s</ol>',
		$wrapper_attributes,
		$block_content
	);
}

/**
 * Registers the `core/footnotes` block on the server.
 *
 * @since 6.3.0
 */
function register_block_core_footnotes() {
	register_block_type_from_metadata(
		__DIR__ . '/footnotes',
		array(
			'render_callback' => 'render_block_core_footnotes',
		)
	);
}
add_action( 'init', 'register_block_core_footnotes' );

/**
 * Registers the footnotes meta field required for footnotes to work.
 *
 * @since 6.5.0
 */
function register_block_core_footnotes_post_meta() {
	$post_types = get_post_types( array( 'show_in_rest' => true ) );
	foreach ( $post_types as $post_type ) {
		// Only register the meta field if the post type supports the editor, custom fields, and revisions.
		if (
			post_type_supports( $post_type, 'editor' ) &&
			post_type_supports( $post_type, 'custom-fields' ) &&
			post_type_supports( $post_type, 'revisions' )
		) {
			register_post_meta(
				$post_type,
				'footnotes',
				array(
					'show_in_rest'      => true,
					'single'            => true,
					'type'              => 'string',
					'revisions_enabled' => true,
				)
			);
		}
	}
}
/*
 * Most post types are registered at priority 10, so use priority 20 here in
 * order to catch them.
*/
add_action( 'init', 'register_block_core_footnotes_post_meta', 20 );

/**
 * Adds the footnotes field to the revisions display.
 *
 * @since 6.3.0
 *
 * @param array $fields The revision fields.
 * @return array The revision fields.
 */
function wp_add_footnotes_to_revision( $fields ) {
	$fields['footnotes'] = __( 'Footnotes' );
	return $fields;
}
add_filter( '_wp_post_revision_fields', 'wp_add_footnotes_to_revision' );

/**
 * Gets the footnotes field from the revision for the revisions screen.
 *
 * @since 6.3.0
 *
 * @param string $revision_field The field value, but $revision->$field
 *                               (footnotes) does not exist.
 * @param string $field          The field name, in this case "footnotes".
 * @param object $revision       The revision object to compare against.
 * @return string The field value.
 */
function wp_get_footnotes_from_revision( $revision_field, $field, $revision ) {
	return get_metadata( 'post', $revision->ID, $field, true );
}
add_filter( '_wp_post_revision_field_footnotes', 'wp_get_footnotes_from_revision', 10, 3 );

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📁 accordion		[ DEL ]
📁 accordion-heading		[ DEL ]
📁 accordion-item		[ DEL ]
📁 accordion-panel		[ DEL ]
📁 archives		[ DEL ]
📁 audio		[ DEL ]
📁 avatar		[ DEL ]
📁 block		[ DEL ]
📁 button		[ DEL ]
📁 buttons		[ DEL ]
📁 calendar		[ DEL ]
📁 categories		[ DEL ]
📁 code		[ DEL ]
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📁 comment-author-name		[ DEL ]
📁 comment-content		[ DEL ]
📁 comment-date		[ DEL ]
📁 comment-edit-link		[ DEL ]
📁 comment-reply-link		[ DEL ]
📁 comment-template		[ DEL ]
📁 comments		[ DEL ]
📁 comments-pagination		[ DEL ]
📁 comments-pagination-next		[ DEL ]
📁 comments-pagination-numbers		[ DEL ]
📁 comments-pagination-previous		[ DEL ]
📁 comments-title		[ DEL ]
📁 cover		[ DEL ]
📁 details		[ DEL ]
📁 embed		[ DEL ]
📁 file		[ DEL ]
📁 footnotes		[ DEL ]
📁 freeform		[ DEL ]
📁 gallery		[ DEL ]
📁 group		[ DEL ]
📁 heading		[ DEL ]
📁 home-link		[ DEL ]
📁 html		[ DEL ]
📁 image		[ DEL ]
📁 latest-comments		[ DEL ]
📁 latest-posts		[ DEL ]
📁 legacy-widget		[ DEL ]
📁 list		[ DEL ]
📁 list-item		[ DEL ]
📁 loginout		[ DEL ]
📁 math		[ DEL ]
📁 media-text		[ DEL ]
📁 missing		[ DEL ]
📁 more		[ DEL ]
📁 navigation		[ DEL ]
📁 navigation-link		[ DEL ]
📁 navigation-submenu		[ DEL ]
📁 nextpage		[ DEL ]
📁 page-list		[ DEL ]
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📁 paragraph		[ DEL ]
📁 pattern		[ DEL ]
📁 post-author		[ DEL ]
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📁 post-author-name		[ DEL ]
📁 post-comments-count		[ DEL ]
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📁 post-comments-link		[ DEL ]
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📁 post-date		[ DEL ]
📁 post-excerpt		[ DEL ]
📁 post-featured-image		[ DEL ]
📁 post-navigation-link		[ DEL ]
📁 post-template		[ DEL ]
📁 post-terms		[ DEL ]
📁 post-time-to-read		[ DEL ]
📁 post-title		[ DEL ]
📁 preformatted		[ DEL ]
📁 pullquote		[ DEL ]
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📁 query-no-results		[ DEL ]
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📁 query-pagination-next		[ DEL ]
📁 query-pagination-numbers		[ DEL ]
📁 query-pagination-previous		[ DEL ]
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📁 quote		[ DEL ]
📁 read-more		[ DEL ]
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📁 spacer		[ DEL ]
📁 table		[ DEL ]
📁 tag-cloud		[ DEL ]
📁 template-part		[ DEL ]
📁 term-count		[ DEL ]
📁 term-description		[ DEL ]
📁 term-name		[ DEL ]
📁 term-template		[ DEL ]
📁 terms-query		[ DEL ]
📁 text-columns		[ DEL ]
📁 verse		[ DEL ]
📁 video		[ DEL ]
📁 widget-group		[ DEL ]
📄 accordion-item.php	2,411 B	[ EDIT ] \| [ DEL ]
📄 accordion.php	1,147 B	[ EDIT ] \| [ DEL ]
📄 archives.php	4,415 B	[ EDIT ] \| [ DEL ]
📄 avatar.php	5,745 B	[ EDIT ] \| [ DEL ]
📄 block.php	4,186 B	[ EDIT ] \| [ DEL ]
📄 blocks-json.php	218,553 B	[ EDIT ] \| [ DEL ]
📄 button.php	1,752 B	[ EDIT ] \| [ DEL ]
📄 calendar.php	6,075 B	[ EDIT ] \| [ DEL ]
📄 categories.php	4,650 B	[ EDIT ] \| [ DEL ]
📄 comment-author-name.php	2,133 B	[ EDIT ] \| [ DEL ]
📄 comment-content.php	2,459 B	[ EDIT ] \| [ DEL ]
📄 comment-date.php	1,863 B	[ EDIT ] \| [ DEL ]
📄 comment-edit-link.php	1,713 B	[ EDIT ] \| [ DEL ]
📄 comment-reply-link.php	2,075 B	[ EDIT ] \| [ DEL ]
📄 comment-template.php	4,494 B	[ EDIT ] \| [ DEL ]
📄 comments-pagination-next.php	1,924 B	[ EDIT ] \| [ DEL ]
📄 comments-pagination-numbers.php	1,632 B	[ EDIT ] \| [ DEL ]
📄 comments-pagination-previous.php	1,790 B	[ EDIT ] \| [ DEL ]
📄 comments-pagination.php	1,261 B	[ EDIT ] \| [ DEL ]
📄 comments-title.php	2,772 B	[ EDIT ] \| [ DEL ]
📄 comments.php	6,784 B	[ EDIT ] \| [ DEL ]
📄 cover.php	3,175 B	[ EDIT ] \| [ DEL ]
📄 file.php	1,879 B	[ EDIT ] \| [ DEL ]
📄 footnotes.php	3,771 B	[ EDIT ] \| [ DEL ]
📄 gallery.php	6,439 B	[ EDIT ] \| [ DEL ]
📄 heading.php	1,301 B	[ EDIT ] \| [ DEL ]
📄 home-link.php	5,438 B	[ EDIT ] \| [ DEL ]
📄 image.php	13,824 B	[ EDIT ] \| [ DEL ]
📄 index.php	5,111 B	[ EDIT ] \| [ DEL ]
📄 latest-comments.php	5,030 B	[ EDIT ] \| [ DEL ]
📄 latest-posts.php	8,734 B	[ EDIT ] \| [ DEL ]
📄 legacy-widget.php	4,011 B	[ EDIT ] \| [ DEL ]
📄 list.php	1,273 B	[ EDIT ] \| [ DEL ]
📄 loginout.php	1,664 B	[ EDIT ] \| [ DEL ]
📄 media-text.php	4,383 B	[ EDIT ] \| [ DEL ]
📄 navigation-link.php	13,961 B	[ EDIT ] \| [ DEL ]
📄 navigation-submenu.php	9,976 B	[ EDIT ] \| [ DEL ]
📄 navigation.php	49,550 B	[ EDIT ] \| [ DEL ]
📄 page-list-item.php	361 B	[ EDIT ] \| [ DEL ]
📄 page-list.php	13,611 B	[ EDIT ] \| [ DEL ]
📄 pattern.php	1,788 B	[ EDIT ] \| [ DEL ]
📄 post-author-biography.php	1,524 B	[ EDIT ] \| [ DEL ]
📄 post-author-name.php	1,951 B	[ EDIT ] \| [ DEL ]
📄 post-author.php	2,734 B	[ EDIT ] \| [ DEL ]
📄 post-comments-count.php	1,275 B	[ EDIT ] \| [ DEL ]
📄 post-comments-form.php	2,805 B	[ EDIT ] \| [ DEL ]
📄 post-comments-link.php	2,237 B	[ EDIT ] \| [ DEL ]
📄 post-content.php	2,347 B	[ EDIT ] \| [ DEL ]
📄 post-date.php	3,632 B	[ EDIT ] \| [ DEL ]
📄 post-excerpt.php	3,612 B	[ EDIT ] \| [ DEL ]
📄 post-featured-image.php	9,363 B	[ EDIT ] \| [ DEL ]
📄 post-navigation-link.php	4,837 B	[ EDIT ] \| [ DEL ]
📄 post-template.php	5,749 B	[ EDIT ] \| [ DEL ]
📄 post-terms.php	3,640 B	[ EDIT ] \| [ DEL ]
📄 post-time-to-read.php	6,493 B	[ EDIT ] \| [ DEL ]
📄 post-title.php	2,138 B	[ EDIT ] \| [ DEL ]
📄 query-no-results.php	1,847 B	[ EDIT ] \| [ DEL ]
📄 query-pagination-next.php	3,781 B	[ EDIT ] \| [ DEL ]
📄 query-pagination-numbers.php	4,770 B	[ EDIT ] \| [ DEL ]
📄 query-pagination-previous.php	3,578 B	[ EDIT ] \| [ DEL ]
📄 query-pagination.php	1,176 B	[ EDIT ] \| [ DEL ]
📄 query-title.php	2,943 B	[ EDIT ] \| [ DEL ]
📄 query-total.php	2,535 B	[ EDIT ] \| [ DEL ]
📄 query.php	5,690 B	[ EDIT ] \| [ DEL ]
📄 read-more.php	1,830 B	[ EDIT ] \| [ DEL ]
📄 require-dynamic-blocks.php	4,700 B	[ EDIT ] \| [ DEL ]
📄 require-static-blocks.php	558 B	[ EDIT ] \| [ DEL ]
📄 rss.php	4,609 B	[ EDIT ] \| [ DEL ]
📄 search.php	23,817 B	[ EDIT ] \| [ DEL ]
📄 shortcode.php	735 B	[ EDIT ] \| [ DEL ]
📄 site-logo.php	6,334 B	[ EDIT ] \| [ DEL ]
📄 site-tagline.php	1,203 B	[ EDIT ] \| [ DEL ]
📄 site-title.php	1,864 B	[ EDIT ] \| [ DEL ]
📄 social-link.php	67,735 B	[ EDIT ] \| [ DEL ]
📄 tag-cloud.php	1,590 B	[ EDIT ] \| [ DEL ]
📄 template-part.php	10,154 B	[ EDIT ] \| [ DEL ]
📄 term-count.php	1,843 B	[ EDIT ] \| [ DEL ]
📄 term-description.php	1,770 B	[ EDIT ] \| [ DEL ]
📄 term-name.php	2,069 B	[ EDIT ] \| [ DEL ]
📄 term-template.php	4,518 B	[ EDIT ] \| [ DEL ]
📄 video.php	2,733 B	[ EDIT ] \| [ DEL ]
📄 widget-group.php	2,438 B	[ EDIT ] \| [ DEL ]