Just install bulk delete plugin, when i active it show error :

Code:
Fatal error:  Allowed memory size of 134217728 bytes exhausted  (tried to allocate 71 bytes) in public_html/wp-includes/taxonomy.php  on line 1992
when i try to edit taxonomy.php at line 1992 but some how i fail to understand the code work

anyone can help ?

bold is line 1992 :
Code:
 * @param string $taxonomy Optional. Update Term to this taxonomy in cache
 */
function update_term_cache($terms, $taxonomy = '') {
    foreach ( (array) $terms as $term ) {
        $term_taxonomy = $taxonomy;
        if ( empty($term_taxonomy) )
            $term_taxonomy = $term->taxonomy;

        wp_cache_add($term->term_id, $term, $term_taxonomy);
    }
}
thanks