Code Snippets

functions.php code snippets

Fix HTTPS links generated from wp_get_attachment_url – Source

function fix_ssl_attachment_url( $url ) {

  if ( is_ssl() )
    $url = str_replace( 'http://', 'https://', $url );
  return $url;
}
add_filter( 'wp_get_attachment_url', 'fix_ssl_attachment_url' );

Disable Pingbacks – Source

add_filter( ‘xmlrpc_methods’, function( $methods ) {
   unset( $methods['pingback.ping'] );
   return $methods;
} );

Maintenance mode without plug-in – source

function maintenace_mode() {
    if ( !current_user_can( 'edit_themes' ) || !is_user_logged_in() ) {wp_die('Maintenance.');}
}
add_action('get_header', 'maintenace_mode');

Using shortcodes to show members-only content – source

add_shortcode( 'visitor', 'visitor_check_shortcode' );
function visitor_check_shortcode( $atts, $content = null ) {
  if ( ( !is_user_logged_in() && !is_null( $content ) ) || is_feed() )
  return $content;
  return '';
}

add_shortcode( 'member', 'member_check_shortcode' );
function member_check_shortcode( $atts, $content = null ) {
if ( is_user_logged_in() && !is_null( $content ) && !is_feed() )
  return $content;
  return '';
}

Search only posts – source

// Search only posts
function SearchFilter($query) {

  if ($query->is_search) {
      $query->set('post_type', 'post');
  }
  
  return $query;

}
add_filter('pre_get_posts','SearchFilter');

Adjust jpeg quality – source

function gpp_jpeg_quality_callback($arg) {

    return (int)100; // change 100 to whatever you prefer, but don't go below 60

}
add_filter('jpeg_quality', 'gpp_jpeg_quality_callback');

Add an excerpt box for pages

//Add an excerpt box for pages
if ( function_exists('add_post_type_support') ){

  add_action('init', 'add_page_excerpts');
  
  function add_page_excerpts(){
  
    add_post_type_support( 'page', 'excerpt' );

  }
}

Customise your admin footer

//change admin footer
function remove_footer_admin () {

  echo 'Fueled by <a href="http://www.wordpress.org" target="_blank">WordPress</a> | Designed by <a href="http://thriveweb.com.au/" target="_blank">thrive</a>';

}
add_filter('admin_footer_text', 'remove_footer_admin');

Define your own login logo – source

//Define your own login logo
function my_custom_login_logo() {

  echo 'h1 a { background-image:url('.get_bloginfo('template_directory').'/images/logo.png) !important;}';

}

add_action('login_head', 'my_custom_login_logo');
add_filter( 'login_headerurl', 'w4_login_headerurl');

function w4_login_headerurl(){

  return home_url('/');

}

Hide the Themes menu item.

//Remove theme menus
add_action('admin_init', 'remove_theme_menus');

function remove_theme_menus() {

  global $submenu;
  
  unset($submenu['themes.php'][5]);
  
  unset($submenu['themes.php'][15]);

}

Add a favicon to your admin area

// add a favicon for your admin
function admin_favicon() {

  echo '<link href="'.get_bloginfo('stylesheet_directory').'/favicon.png" rel="Shortcut" type="image/x-icon" />';

}

add_action('admin_head', 'admin_favicon');

Remove unused menu items – source

function remove_menus () {

  global $menu;
  
  $restricted = array(__('Dashboard'), __('Posts'), __('Media'), __('Links'), __('Pages'), __('Appearance'), __('Tools'), __('Users'), __('Settings'), __('Comments'), __('Plugins'));
  
  end ($menu);
  
  while (prev($menu)){
  
    $value = explode(' ',$menu[key($menu)][0]);
    
    if(in_array($value[0] != NULL?$value[0]:"" , $restricted)){unset($menu[key($menu)]);}
    
  }

}

add_action('admin_menu', 'remove_menus');

Remove admin tool bar – source

//Remove admin tool bar
function my_function_admin_bar(){
  return 0;
}

add_filter( 'show_admin_bar' , 'my_function_admin_bar');

Limit the max upload size – source

add_filter('wp_handle_upload_prefilter', function($file) {
  
  $size = $file['size'];
  
  if ($size > 500 * 1024) {
  
  $file['error'] = '"Files larger than X bytes are prevented from uploads.';
  
  }
  
  return $file;

});