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79 lines
1.6 KiB
PHP
79 lines
1.6 KiB
PHP
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<?php
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/**
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* Server-side rendering of the `core/footnotes` block.
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*
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* @package WordPress
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*/
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/**
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* Renders the `core/footnotes` block on the server.
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*
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* @param array $attributes Block attributes.
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* @param string $content Block default content.
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* @param WP_Block $block Block instance.
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*
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* @return string Returns the HTML representing the footnotes.
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*/
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function render_block_core_footnotes( $attributes, $content, $block ) {
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// Bail out early if the post ID is not set for some reason.
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if ( empty( $block->context['postId'] ) ) {
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return '';
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}
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if ( post_password_required( $block->context['postId'] ) ) {
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return;
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}
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$footnotes = get_post_meta( $block->context['postId'], 'footnotes', true );
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if ( ! $footnotes ) {
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return;
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}
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$footnotes = json_decode( $footnotes, true );
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if ( count( $footnotes ) === 0 ) {
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return '';
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}
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$wrapper_attributes = get_block_wrapper_attributes();
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$block_content = '';
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foreach ( $footnotes as $footnote ) {
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$block_content .= sprintf(
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'<li id="%1$s">%2$s <a href="#%1$s-link">↩︎</a></li>',
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$footnote['id'],
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$footnote['content']
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);
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}
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return sprintf(
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'<ol %1$s>%2$s</ol>',
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$wrapper_attributes,
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$block_content
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);
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}
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/**
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* Registers the `core/footnotes` block on the server.
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*/
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function register_block_core_footnotes() {
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register_post_meta(
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'post',
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'footnotes',
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array(
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'show_in_rest' => true,
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'single' => true,
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'type' => 'string',
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)
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);
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register_block_type_from_metadata(
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__DIR__ . '/footnotes',
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array(
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'render_callback' => 'render_block_core_footnotes',
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)
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);
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}
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add_action( 'init', 'register_block_core_footnotes' );
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