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This hook occurs 2 times in this file.

Line Code
1181                     $css_class[] = 'current_page_item';
1182                elseif ( $_current_page && $page->ID == $_current_page->post_parent )
1183                     $css_class[] = 'current_page_parent';
1184           } elseif ( $page->ID == get_option('page_for_posts') ) {
1185                $css_class[] = 'current_page_parent';
1186           }
1187
1188           $css_class = implode(' ', apply_filters('page_css_class', $css_class, $page));
1189
1190           $output .= $indent . '<li class="' . $css_class . '"><a href="' . get_page_link($page->ID) . '" title="' . esc_attr(apply_filters('the_title', $page->post_title)) . '">' . $link_before . apply_filters('the_title', $page->post_title) . $link_after . '</a>';
1191
1192           if ( !empty($show_date) ) {
1193                if ( 'modified' == $show_date )
1194                     $time = $page->post_modified;
1195                else
1196                     $time = $page->post_date;
1197
1198                $output .= " " . mysql2date($date_format, $time);
1199           }