WordPress Instant Articles Sanitize Post

wordpress-instant-articles-sanitize.php

<?php
// Sanitizing / replace the table shortcode with the table before the post gets transformed to IA.
add_action('instant_articles_before_transform_post', function () {
    add_filter('the_content', 'sanitize_content_for_ia');
});

function sanitize_content_for_ia($content) {
    if (in_category(array('videos', 'mehrseitig'))) {
        $content = preg_replace('@\[sam id=.*?\]@', '', $content);      // sam id repalcement

        $shortcode_pattern = '@\[table id=\s*(\d+).*?\]@';      //  Pattern to match the [table id=N /]
        $matches = array();

        // replacment if table shortcode found
        if (preg_match_all($shortcode_pattern, $content, $matches)) {
            if (isset($matches[1]) && !empty($matches[1])) {
                $table_ids = $matches[1];
                $table_data = replace_table_shortcode_with_table($content, $table_ids);

                $content = $table_data;     // table + content
            }
        }
        $content = sanitize_post_content($content);
    }

    return $content;
}