Standard snippets I add to most WP projects -security, usability, cleaner code etc.

WP Functions

//Remove specific login errors to prevent hackers knowing that they got either the password or username correct. Renable if users are facing issues.
add_filter('login_errors',create_function('$a', "return null;"));

//Remove multiple jQuery script tags and import one using the specified version
if( !is_admin()){
  wp_deregister_script('jquery');
  wp_register_script('jquery', ("http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"), false, '1.9.1');
  wp_enqueue_script('jquery');
}

// remove junk from wp_head
remove_action('wp_head', 'rsd_link');
remove_action('wp_head', 'wp_generator');
remove_action('wp_head', 'feed_links', 2);
remove_action('wp_head', 'index_rel_link');
remove_action('wp_head', 'wlwmanifest_link');
remove_action('wp_head', 'feed_links_extra', 3);
remove_action('wp_head', 'start_post_rel_link', 10, 0);
remove_action('wp_head', 'parent_post_rel_link', 10, 0);
remove_action('wp_head', 'adjacent_posts_rel_link', 10, 0);

// add google analytics to header
function add_google_analytics() {
  echo '<script src="http://www.google-analytics.com/ga.js" type="text/javascript"></script>';
  echo '<script type="text/javascript">';
  echo 'var pageTracker = _gat._getTracker("UA-XXXXX-X");';
  echo 'pageTracker._trackPageview();';
  echo '</script>';
}
add_action('wp_head', 'add_google_analytics');

//Remove version number
function wpbeginner_remove_version() {
return '';
}
add_filter('the_generator', 'wpbeginner_remove_version');