PHP is_404函数代码示例

function title()
{
    if (is_category()) {
        echo 'Category Archive for "';
        single_cat_title();
        echo '" | ';
        bloginfo('name');
    } elseif (is_tag()) {
        echo 'Tag Archive for "';
        single_tag_title();
        echo '" | ';
        bloginfo('name');
    } elseif (is_archive()) {
        wp_title('');
        echo ' Archive | ';
        bloginfo('name');
    } elseif (is_search()) {
        echo 'Search for "' . wp_specialchars($s) . '" | ';
        bloginfo('name');
    } elseif (is_home() || is_front_page()) {
        bloginfo('name');
        echo ' | ';
        bloginfo('description');
    } elseif (is_404()) {
        echo 'Error 404 Not Found | ';
        bloginfo('name');
    } elseif (is_single()) {
        wp_title('');
    } else {
        echo wp_title(' | ', false, right);
        bloginfo('name');
    }
}

function base_getBreadcrumbs()
{
    if (is_404()) {
        return false;
    }
    // Hack to fix breadcrumbs when you're viewing the news home
    if (is_home()) {
        $post = new \Timber\Post(get_option('page_for_posts'));
    } else {
        global $post;
    }
    $breadcrumbs = [];
    if ($post->post_parent) {
        $parent_id = $post->post_parent;
        while ($parent_id) {
            $page = get_page($parent_id);
            $breadcrumbs[] = new \Timber\Post($page->ID);
            $parent_id = $page->post_parent;
        }
        $breadcrumbs = array_reverse($breadcrumbs);
    }
    // Add 'Blog Home' to breadcrumbs if you're on a news post or archive
    if ((is_single() || is_archive()) && !is_search()) {
        $breadcrumbs[] = new \Timber\Post(get_option('page_for_posts'));
    }
    return $breadcrumbs;
}

/**
 * Prints better page title
 */
function perfect_title()
{
    echo '<title>';
    if (function_exists('is_tag') && is_tag()) {
        single_tag_title(__('Tag Archive for') . '&quot;');
        $output .= '&quot; - ';
    } elseif (is_archive()) {
        wp_title('');
        echo __('Archive') . ' - ';
    } elseif (is_search()) {
        echo __('Search for') . '&quot;' . esc_html($s) . '&quot; - ';
    } elseif (!is_404() && is_single() || is_page()) {
        wp_title('');
        echo ' - ';
    } elseif (is_404()) {
        echo __('Not Found') . '-';
    }
    if (is_home()) {
        bloginfo('name');
        echo ' - ';
        bloginfo('description');
    } else {
        bloginfo('name');
    }
    if ($paged > 1) {
        echo ' - ' . __('page') . ' ' . $paged;
    }
    echo '</title>';
}

function qtranxf_wp_head()
{
    global $q_config;
    if ($q_config['header_css_on']) {
        echo '<style type="text/css">' . PHP_EOL . $q_config['header_css'] . '</style>' . PHP_EOL;
    }
    do_action('qtranslate_head_add_css');
    //not really needed?
    // skip the rest if 404
    if (is_404()) {
        return;
    }
    // set links to translations of current page
    foreach ($q_config['enabled_languages'] as $lang) {
        if (!empty($q_config['locale_html'][$lang])) {
            $hreflang = $q_config['locale_html'][$lang];
        } else {
            $hreflang = $lang;
        }
        //if($language != qtranxf_getLanguage())//standard requires them all
        echo '<link hreflang="' . $hreflang . '" href="' . qtranxf_convertURL('', $lang, false, true) . '" rel="alternate" />' . PHP_EOL;
    }
    //https://support.google.com/webmasters/answer/189077
    echo '<link hreflang="x-default" href="' . qtranxf_convertURL('', $q_config['default_language']) . '" rel="alternate" />' . PHP_EOL;
    //qtranxf_add_css();// since 3.2.5 no longer needed
}

 /**
  * returns the language based on the queried content
  *
  * @since 1.2
  *
  * @return object|bool detected language, false if none was found
  */
 protected function get_language_from_content()
 {
     // no language set for 404
     if (is_404() || is_attachment() && !$this->options['media_support']) {
         return $this->get_preferred_language();
     }
     if ($var = get_query_var('lang')) {
         $lang = explode(',', $var);
         $lang = $this->model->get_language(reset($lang));
         // choose the first queried language
     } elseif ((is_single() || is_page() || is_attachment() && $this->options['media_support']) && (($var = get_queried_object_id()) || ($var = get_query_var('p')) || ($var = get_query_var('page_id')) || ($var = get_query_var('attachment_id')))) {
         $lang = $this->model->post->get_language($var);
     } else {
         foreach ($this->model->get_translated_taxonomies() as $taxonomy) {
             if ($var = get_query_var(get_taxonomy($taxonomy)->query_var)) {
                 $lang = $this->model->term->get_language($var, $taxonomy);
             }
         }
     }
     /**
      * Filter the language before it is set from the content
      *
      * @since 0.9
      *
      * @param bool|object $lang language object or false if none was found
      */
     return apply_filters('pll_get_current_language', isset($lang) ? $lang : false);
 }

function featureText()
{
    if (is_front_page()) {
        the_field('feature_text');
    } elseif (is_home() || is_single()) {
        _e('Rock Theme Official Blog');
    } elseif (is_archive()) {
        _e('Rock Theme Official Blog');
        _e('<br>');
        single_term_title('Browsing: ');
        if (is_month()) {
            $monthNum = get_query_var('monthnum');
            $month = date('F', mktime(0, 0, 0, $monthNum));
            $year = get_query_var('year');
            echo 'Posts from ' . $month . ' ' . $year;
        }
    } elseif (is_page_template('page-news.php') || is_page_template('page-about.php') || is_page_template('page-contact.php')) {
        bloginfo('name');
        _e('<br>');
        the_title();
    } elseif (is_404()) {
        _e('Whoops, were a little lost.');
    } elseif (is_search()) {
        _e('Rock Theme Official Blog');
        _e('<br>');
        printf('Search results for: %s', get_search_query());
    }
}

function bavota_breadcrumbs()
{
    if (!is_front_page()) {
        echo '<a href="' . home_url('/') . 'blog">Blog</a><span class="divider"> <i class="icon-angle-right"></i> </span>';
    }
    if (is_category() || is_single()) {
        $category = get_the_category();
        $ID = $category[0]->cat_ID;
        // echo get_category_parents($ID, TRUE, ' ', FALSE ); // was causing errors in the error_log
        echo is_wp_error($cat_parents = get_category_parents($ID, TRUE, ' ', FALSE)) ? '' : $cat_parents;
    }
    $mytitle = get_the_title();
    if (strlen($mytitle) > 22) {
        $mytitle = substr($mytitle, 0, 38) . "...";
    }
    if (is_single() || is_page()) {
        echo ' <span class="divider"> <i class="icon-angle-right"></i> </span> ';
        echo $mytitle;
    }
    if (is_tag()) {
        echo "Tag: " . single_tag_title('', FALSE);
    }
    if (is_404()) {
        echo "404 - Page not Found";
    }
    if (is_search()) {
        echo "Search";
    }
    if (is_year()) {
        echo get_the_time('Y');
    }
}

/**
 * Custom class for the WP 'body_class()' function
 * updated: 4/15/10
 */
function dbdb_body_classes($classes)
{
    // source http://darrinb.com/notes/2010/customizing-the-wordpress-body_class-function/
    global $post;
    global $wp_query;
    // if there is no parent ID and it's not a single post page, category page, or 404 page, give it
    // a class of "parent-page"
    if ($post->post_parent < 1 && !is_single() && !is_archive() && !is_404()) {
        $classes[] = 'parent-page';
    }
    // if the page/post has a parent, it's a child, give it a class of its parent name
    if ($post->post_parent > 0) {
        /* $parent_title = get_the_title($wp_query->post->post_parent);
           $parent_title = preg_replace('#\s#','-', $parent_title);
           $parent_title = strtolower($parent_title);
           $classes[] = 'parent-pagename-'.$parent_title; */
        $parent_id = wp_get_post_parent_id($wp_query->post);
        // $parent_id = get_the_ID($wp_query->post->post_parent);
        echo "PARENT ID : " . $parent_id;
        // $parent_id = preg_replace('#\s#','-', $parent_id);
        $parent_id = strtolower($parent_id);
        $classes[] = 'parent-id-' . $parent_id;
    }
    // add a class = to the name of post or page
    $classes[] = $wp_query->queried_object->post_name;
    return array_unique($classes);
}

/**
 * Filters wp_title to print a neat <title> tag based on what is being viewed.
 *
 * @param string $title Default title text for current view.
 * @param string $sep Optional separator.
 * @return string The filtered title.
 */
function cinnamon_wp_title($title, $sep)
{
    /**
     * If this is version 4.1, directly stop the manual title modification. Let WordPress does that through add_theme_support( 'title-tag' );
     */
    if (function_exists('_wp_render_title_tag')) {
        return $title;
    }
    if (is_feed()) {
        return $title;
    }
    global $page, $paged;
    // Add the blog name
    $title .= get_bloginfo('name', 'display');
    // Add the blog description for the home/front page.
    $site_description = get_bloginfo('description', 'display');
    if ($site_description && (is_home() || is_front_page())) {
        $title .= " {$sep} {$site_description}";
    }
    // Add a page number if necessary:
    if (($paged >= 2 || $page >= 2) && !is_404()) {
        $title .= " {$sep} " . sprintf(__('Page %s', 'cinnamon'), max($paged, $page));
    }
    return $title;
}

 /**
  * Get the ID for the current post
  */
 private function get_the_ID()
 {
     if (is_404()) {
         return '';
     }
     return get_the_ID();
 }

 function display($args = array())
 {
     /* Use the generic_content action if it's set.  See http://core.trac.wordpress.org/ticket/20509 */
     if ($this->get_setting('mode', 'default') == 'default' && has_action('generic_content') && !did_action('generic_content')) {
         return do_action('generic_content');
     }
     /* Since it's impossible to get the $wp_query in its correct form when loading the content from admin-ajax.php, we will display this notice. */
     if (headway_get('ve-live-content-query', $this->block, false) && $this->get_setting('mode', 'default') == 'default') {
         echo '<div class="alert alert-yellow" style="margin: 5px;"><p><strong>Please note:</strong> What\'s being displayed here in the Content Block may not be correct.  When viewing the site outside of the Visual Editor, you will see the correct content.</p></div>';
     }
     /* If LoopBuddy is activated, we'll strictly rely on it for the query setup and how the content is displayed. */
     if (class_exists('pluginbuddy_loopbuddy')) {
         global $pluginbuddy_loopbuddy;
         $loopbuddy_query = $this->get_setting('loopbuddy-query', -1);
         $loopbuddy_layout = $this->get_setting('loopbuddy-layout', -1);
         if (isset($pluginbuddy_loopbuddy) && $loopbuddy_query !== -1) {
             echo $pluginbuddy_loopbuddy->render_loop($loopbuddy_query, $loopbuddy_layout);
             $this->remove_hooks();
             return;
         }
     }
     /* Display the 404 text if it's a 404 (has to be default behavior) */
     if (is_404() && $this->get_setting('mode', 'default') == 'default' && !headway_get('ve-live-content-query', $this->block, false)) {
         $this->remove_hooks();
         return $this->display_404();
     }
     /* Display loop like normal if nothing else fires first */
     $this->loop($args);
     $this->remove_hooks();
     wp_reset_query();
 }

 function mh_page_title()
 {
     if (is_home()) {
         echo get_the_title(get_option('page_for_posts', true));
     } elseif (is_author()) {
         global $author;
         $user_info = get_userdata($author);
         echo __('Articles by ', 'mh') . esc_attr($user_info->display_name);
     } elseif (is_category() || is_tax()) {
         echo single_cat_title("", false);
     } elseif (is_tag()) {
         echo single_tag_title("", false);
     } elseif (is_search()) {
         echo __('Search Results for ', 'mh') . get_search_query();
     } elseif (is_day()) {
         echo get_the_date();
     } elseif (is_month()) {
         echo get_the_date('F Y');
     } elseif (is_year()) {
         echo get_the_date('Y');
     } elseif (is_404()) {
         echo __('Page not found (404)', 'mh');
     } else {
         echo get_the_title();
     }
 }

function ubik_seo_meta_description($desc = '')
{
    // Generate a meta description
    if (empty($desc)) {
        // Single posts, pages, and attachments
        if (is_singular()) {
            $post = get_post();
            if (empty($post)) {
                $desc = '';
            }
            $desc = wptexturize($post->post_content);
            // Get the entire contents, not the excerpt, so as to not duplicate Ubik Excerpt
        }
        // Check to see if we have a description for this category, tag, or taxonomy
        if (is_category() || is_tag() || is_tax()) {
            $desc = term_description();
        }
        // Now match other possibilities...
        if (is_author()) {
            $desc = get_the_author_meta('description');
        }
        // Front or home page
        if (is_front_page() || is_home()) {
            $desc = get_bloginfo('description');
        }
        // No excerpt to return
        if (is_404() || is_search()) {
            $desc = '';
        }
        $desc = ubik_seo_meta_description_sanitize($desc);
    }
    return apply_filters('ubik_seo_meta_description', $desc);
}

/**
 * Add our own classes to the body_class function
 * adapted from: http://www.mimoymima.com/2013/01/lab/better-body-class-function-wordpress/
 * 
 * @20131220: This in an update to the earlier code, where it was needed to change the call to the body_class.
 * with the snippet below however that is no longer necessary and as an additional advantage it also keeps the
 * original WordPress body class which may (or may not) come in handy one day.
 *
 * @20140423 adjusted the code to make it more useful
 */
function so_body_classes($classes)
{
    global $post;
    // return some of these things
    if (is_category()) {
        $classes[] = 'cat-archive';
    } elseif (is_search()) {
        $classes[] = 'search-page';
    } elseif (is_tag()) {
        $classes[] = 'tag-archive';
    } elseif (is_home()) {
        $classes[] = 'home-page';
    } elseif (is_404()) {
        $classes[] = 'error-page';
    }
    // return page-(page name)
    if (is_page()) {
        $pn = $post->post_name;
        $classes[] = 'page-' . $pn;
    }
    if (is_page() && $post->post_parent) {
        $classes[] = 'child-of-' . $parentSlug;
    }
    // if WPML has been installed return the language code
    if (in_array('sitepress-multilingual-cms/sitepress.php', apply_filters('active_plugins', get_option('active_plugins')))) {
        if (defined('ICL_LANGUAGE_CODE')) {
            $lang = 'lang-' . ICL_LANGUAGE_CODE;
            $classes[] = $lang;
        }
    }
    return $classes;
}

 /**
  *
  * Returns the list of classes
  *
  * @param $post
  * @return array
  * @author Tim Perry
  */
 protected function getBodyClasses($post)
 {
     $classes = array();
     if (is_single()) {
         $classes[] = "single";
     } else {
         $classes[] = "page";
     }
     if (is_page()) {
         $classes[] = 'page--' . $post->post_name;
     }
     if (is_404()) {
         $classes[] = 'page--404';
     } elseif (is_front_page()) {
         $classes[] = 'page--front';
     } elseif (is_home()) {
         $classes[] = 'page--news';
     } elseif (is_search()) {
         $classes[] = 'page--search';
     } elseif (is_single() && ($postType = strtolower(str_replace("_", "-", $post->post_type)))) {
         $classes[] = "single--" . $postType;
     }
     if (is_user_logged_in()) {
         $classes[] = 'has-admin-bar';
     }
     return $classes;
 }