Wordpress php issue with creating custom filter -

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i'm new working filters, keen make plugin building extensible.

in main plugin have following class , function:

class skizzar_admin_theme_pages {  // return (array) properties of skizzar admin theme admin pages static function get_pages( $page_slug = '' ) {      $pages = array();     // default page properties     $default_args = array(         'menu-title' => '',         'tab-title' => '',         'parent' => 'admin.php',         'in-menu' => false,         'has-tab' => true,         'tab-side' => false,         'top-level' => false,     );      $pages['sat-options-general'] = array_merge(         $default_args,         array(             'slug' => 'sat-options-general',             'menu-title' => _x( 'admin theme', 'page title in menu', 'skizzar_admin_theme' ),             'tab-title' => _x( 'admin theme options', 'option tab title', 'skizzar_admin_theme' ),             'title' => _x( 'admin theme options', 'option page title', 'skizzar_admin_theme' ),             'callback' => array( __class__, 'display_general_options_page' ),             'in-menu' => true,             'top-level' => true,         )     );      $pages['sat-addons'] = array_merge(         $default_args,         array(             'slug' => 'sat-addons',             'menu-title' => _x( 'addons', 'page title in menu', 'skizzar_admin_theme' ),             'tab-title' => _x( 'addons', 'option tab title', 'skizzar_admin_theme' ),             'title' => _x( 'browse addons', 'option page title', 'skizzar_admin_theme' ),             'callback' => array( __class__, 'display_addons_page' ),             'in-menu' => true,         )     );        return apply_filters( 'skizzar_admin_theme_tab', $pages, $default_args, $page_slug );   }  // output content of requested options page static function display_general_options_page() {     $page_info = self::get_pages( 'sat-options-general' );     include( plugin_dir_path( __file__ ) . 'inc/page-options-general.php' ); } ... }

in nutshell, array used create submenu page , tabs across top of page, amongst other things. see have added filter:

apply_filters( 'skizzar_admin_theme_tab', $pages, $default_args, $page_slug );

to function get_pages(), can add pages addon plugin.

in addon plugin, have following function:

function add_google_analytics_tab( $pages, $default_args, $page_slug ) {      $pages['sat-ga'] = array_merge(             $default_args,             array(                 'slug' => 'sat-ga',                 'menu-title' => _x( 'ga', 'page title in menu', 'skizzar_admin_theme' ),                 'tab-title' => _x( 'ga', 'option tab title', 'skizzar_admin_theme' ),                 'title' => _x( 'ga', 'option page title', 'skizzar_admin_theme' ),                 'callback' => array( __class__, 'display_ga_page' ),                 'in-menu' => true,             )         );         // return         if ( $page_slug ) {             if ( ! isset( $pages[ $page_slug ] ) ) {                 return null;             }             return $pages[ $page_slug ];         }         return $pages; } function display_ga_page() {     echo 'ga settings go here'; }

this called using following add_filter function:

add_filter( 'skizzar_admin_theme_tab', array(&$this, 'add_google_analytics_tab', 1, 3) );

the hope add array get_pages() function in main plugin, adding submenu item , tabs etc.

however, met fololwing errors:

call_user_func_array() expects parameter 1 valid callback, array must have 2 members in ...plugin.php on line 235  invalid argument supplied foreach() in ...class-sat-menu.php on line 13

here referenced line in class-sat-menu.php

static function action_add_menu_entries() {      // skizzar admin theme pages     foreach ( skizzar_admin_theme_pages::get_pages() $page_info ) {          if ( ! $page_info['in-menu'] ) {             $page_info['parent'] = null;         }          if ($page_info['top-level']) {             add_menu_page(                 $page_info['title'], // page title                 ( $page_info['menu-title'] ? $page_info['menu-title'] : $page_info['title'] ), // menu title                 skizzar_admin_theme_user::get_admin_cap(), // capability                 $page_info['slug'], // slug                 $page_info['callback'] // callback             );          }         else {             add_submenu_page(                 'sat-options-general',                 $page_info['title'],                 ( $page_info['menu-title'] ? $page_info['menu-title'] : $page_info['title'] ),                 skizzar_admin_theme_user::get_admin_cap(),                 $page_info['slug'],                 $page_info['callback']             );         }      }  }

i can't quite head around error is, advise or appreciated


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