actions

The footer doesn’t run in the global context, so the variable $map_vars is not in the correct scope. To keep the variable and the callback in the same scope, you could use a class: class Map_Var_Example { public static $map_vars; public static function map_data() { var_dump( self::$map_vars ); } } Map_Var_Example::$map_vars=”Test”; add_action( ‘wp_footer’, array( ‘Map_Var_Example’, … Read more

You can simply remove those menu items in your check_username method. add_action(‘admin_init’, ‘check_username’); function check_username() { $user = wp_get_current_user(); if( $user && isset($user->user_email) && ‘[email protected]’ == $user->user_email ) { remove_menu_page(‘tools.php’); remove_menu_page(‘themes.php’); remove_menu_page(‘options-general.php’); remove_menu_page(‘plugins.php’); } } Your code doesn’t work, because the admin_init action is invoked after admin_menu. Please see the Action reference page in WordPress … Read more

You must register callbacks before they are called (add_action() and add_filter() are registration functions, they remember what to do when). Try the following in your functions.php or in your plugin: add_action( ‘topofthetop’, ‘load_FB_JS_SDK’ ); function load_FB_JS_SDK() { if ( is_singular() && have_comments() ) someclass::FB_JS_SDK(); }