WordPress/wp-includes/blocks/footnotes.php

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<?php
/**
* Server-side rendering of the `core/footnotes` block.
*
* @package WordPress
*/
/**
* Renders the `core/footnotes` block on the server.
*
* @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 ( count( $footnotes ) === 0 ) {
return '';
}
$wrapper_attributes = get_block_wrapper_attributes();
$block_content = '';
foreach ( $footnotes as $footnote ) {
$block_content .= sprintf(
'<li id="%1$s">%2$s <a href="#%1$s-link">↩︎</a></li>',
$footnote['id'],
$footnote['content']
);
}
return sprintf(
'<ol %1$s>%2$s</ol>',
$wrapper_attributes,
$block_content
);
}
/**
* Registers the `core/footnotes` block on the server.
*/
function register_block_core_footnotes() {
register_post_meta(
'post',
'footnotes',
array(
'show_in_rest' => true,
'single' => true,
'type' => 'string',
)
);
register_block_type_from_metadata(
__DIR__ . '/footnotes',
array(
'render_callback' => 'render_block_core_footnotes',
)
);
}
add_action( 'init', 'register_block_core_footnotes' );