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webplus-footnotes.php
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webplus-footnotes.php
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<?php
/**
* Plugin Name: WebPlus FootNotes
* Plugin URI: https://github.com/shirokoweb/webplus-footnotes/
* Description: This plugin adds footnotes to articles.
* Version: 1.0.0
* Author: shirokoweb
* Author URI: https://webplus.agency
* License: GPL-3.0-or-later
* License URI: https://www.gnu.org/licenses/gpl-3.0.html
* Text Domain: webplus-footnotes
*/
defined( 'ABSPATH' ) || exit;
/**
* Load plugin text domain.
*/
function wpf_load_textdomain() {
load_plugin_textdomain( 'webplus-footnotes', false, dirname( plugin_basename( __FILE__ ) ) . '/languages' );
}
add_action( 'plugins_loaded', 'wpf_load_textdomain' );
/**
* Add footnotes to the content.
*
* @param string $content The content of the post.
* @return string $content The content of the post with added footnotes.
*/
function wpf_add_footnotes( $content ) {
$matches = array();
if ( preg_match_all( '/\(\((.*?)\s?ref:(.*?)\)\)/', $content, $matches, PREG_SET_ORDER ) > 0 ) {
$footnotes = '';
$count = 1;
foreach ( $matches as $match ) {
$citation = sanitize_text_field( $match[1] );
$url = esc_url_raw( $match[2] );
$citation_link = '<a id="citation-' . $count . '" href="#footnote-' . $count . '"><sup>[' . $count . ']</sup></a>';
$footnote_link = '<li id="footnote-' . $count . '"><a href="#citation-' . $count . '">^</a> <a href="' . $url . '">' . $citation . '</a></li>';
$content = str_replace( $match[0], $citation_link, $content );
$footnotes .= $footnote_link;
$count++;
}
$footnotes = '<hr><h3>' . esc_html__( 'References', 'webplus-footnotes' ) . '</h3><ol>' . $footnotes . '</ol>';
$content .= '<div class="footnotes">' . $footnotes . '</div>';
}
return $content;
}
add_filter( 'the_content', 'wpf_add_footnotes' );