Some fun WordPress snippets

functions.php

<?php

/**
 * Check if on posts-page
 */
function is_page_for_posts () {
  return ( is_home() || (is_archive() && ! is_post_type_archive() ) );
}


/**
 * Check if is search page
 * @return boolean [description]
 */
function is_search_page () {
  if (is_search()) {
    return true;
  }

  $search_template_page = get_pages_with_template('search.php');
  if ($search_template_page && is_page($search_template_page[0]->ID)) {
    return true;
  }
}


/**
 * Get post page url
 */
function get_page_for_posts_url () {
  return get_permalink(get_option( 'page_for_posts' ));
}


/**
 * Get pages using a specific template
 */
function get_pages_with_template($template) {
  return get_pages(array(
    'meta_key' => '_wp_page_template',
    'meta_value' => $template
  ));
}


/**
 * Get page depth
 */
function get_page_depth ($page) {
  if (!$page) {
    return;
  }

  $parent_id  = $page->post_parent;
  $depth = 0;

  while ($parent_id > 0) {
    $parent = get_page($parent_id);
    $parent_id = $parent->post_parent;
    $depth++;
  }

  return $depth;
}


/**
 * Totaly disable comments
 */
add_action( 'init', function () {
  remove_post_type_support( 'post', 'comments' );
  remove_post_type_support( 'page', 'comments' );
});

add_action( 'admin_menu', function () {
  remove_menu_page( 'edit-comments.php' );
});

add_action( 'wp_before_admin_bar_render', function () {
  global $wp_admin_bar;
  $wp_admin_bar->remove_menu( 'comments' );
});


/**
 * Custom avatars.
 * @link https://codex.wordpress.org/How_to_Use_Gravatars_in_WordPress
 *
 * @param $user_contact Existing avatars
 */
add_filter( 'avatar_defaults', function ( $avatar_defaults ) {
  $my_avatar = get_bloginfo( 'template_directory' ) . '/images/my-avatar.gif';
  $avatar_defaults[$my_avatar] = "My Avatar";
  return $avatar_defaults;
}, 999);


/**
 * Custom left admin footer text
 * @link https://developer.wordpress.org/reference/hooks/admin_footer_text/
 */
add_filter( 'admin_footer_text', function () {
  return '<span id="footer-thankyou">Website by <a href="//vincentorback.se" target="_blank">Vincent Orback</a></span>';
}, 999);


/**
 * Custom right admin footer text (where the WordPress version nr is)
 */
add_filter( 'update_footer', function () {
  return '¯\_(ツ)_/¯';
}, 999);


/**
 * Stay logged in for longer
 */
add_filter( 'auth_cookie_expiration', function () {
  return 31556926; // 1 year
});