Title: call_user_func_array() expects parameter 1 to be a valid callback
Last modified: August 24, 2016

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# call_user_func_array() expects parameter 1 to be a valid callback

 *  [d4ng](https://wordpress.org/support/users/d4ng/)
 * (@d4ng)
 * [11 years, 2 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-4/)
 * Hello I have problem with my plugin :/
 * > Warning: call_user_func_array() expects parameter 1 to be a valid callback,
   > function ‘wp_slider_info_page’ not found or invalid function name in C:\xampp\
   > htdocs\wordpress\wp-includes\plugin.php on line 496
 * I found many topics about this warning but I still don’t know what is wrong..:/
 *     ```
       if ( !class_exists( 'wp_slider' ) ) {
   
       	class wp_slider{
   
       		function __construct() {
   
       			add_action( 'admin_menu', array( $this, 'wp_slider_info' ) );
       			add_action( 'slider-style', array( $this, 'slider_styles') );
       			add_action( 'slider-script', array( $this, 'slider_scripts') );
   
       			add_filter( 'the_content', array( $this, 'wp_slider_info_page') );
   
       			register_activation_hook( __FILE__, array( $this, 'wp_install' ) );
       			register_deactivation_hook(__FILE__, array( $this, 'wp_uninstall' ) );
       		}
   
       		function wp_slider_info(){
   
       			add_menu_page('wp Slider', 'wp Slider', 'administrator', 'slider-info', 'wp_slider_info_page', 'dashicons-format-video');
       		}
   
       		function wp_install(){
       			global $wpdb;
       			$table_name=$wpdb->prefix.'wp_slider';
       			$sql="CREATE TABLE $table_name (
       			id int(11) NOT NULL AUTO_INCREMENT,
       			image varchar(255) NOT NULL,
       			link varchar(255) NOT NULL,
       			title varchar(255) NOT NULL,
       			content text NULL,
       			UNIQUE KEY id (id)
       			);";
   
       			require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
       			dbDelta( $sql );
       		}
   
       		function wp_uninstall(){
       			global $wpdb;
       			$table_name=$wpdb->prefix.'wp_slider';
       			$sql='DROP TABLE '.$table_name;
       				$wpdb->query($sql);
       		}
   
       		public function slider_scripts() {
   
       			if (!is_admin()) {
       				wp_register_style('slider-script', plugins_url('slider-script.js', __FILE__), array( 'jquery' ));
       				wp_enqueue_style('slider-script');
       			}
       		}
   
       		public function slider_styles( $page ) {
   
       			wp_register_style('slider-style', plugins_url('slider-style.css', __FILE__));
       			wp_enqueue_style('slider-style');
       		}
   
       		function wp_slider_info_page( $content ){
   
       			return $content . '<p>Test</p>';
       		}
   
       	}
   
       	new wp_slider();
   
       }
       ```
   

Viewing 5 replies - 1 through 5 (of 5 total)

 *  Thread Starter [d4ng](https://wordpress.org/support/users/d4ng/)
 * (@d4ng)
 * [11 years, 2 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-4/#post-5962421)
 * solution…
 * `add_menu_page('wp Slider', 'wp Slider', 'administrator', 'slider-info', array(
   $this, 'wp_slider_info_page' ), 'dashicons-format-video');`
 *  [gilbertoquintana](https://wordpress.org/support/users/gilbertoquintana/)
 * (@gilbertoquintana)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-4/#post-5962665)
 * Necesito ayuda al querer entrar al administrador me sale el siguiente error:
 * PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback,
   function ‘wp_site_icon’ not found or invalid function name in D:\INETPUB\VHOSTS\
   elemento3.com\httpdocs\wp-includes\plugin.php on line 496
 *  [gilbertoquintana](https://wordpress.org/support/users/gilbertoquintana/)
 * (@gilbertoquintana)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-4/#post-5962666)
 * I need help wanting to enter the administrator I get the following error:
 * PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback,
   function ‘wp_site_icon’ not found or invalid function name in D:\INETPUB\VHOSTS\
   elemento3.com\httpdocs\wp-includes\plugin.php on line 496
 *  [gilbertoquintana](https://wordpress.org/support/users/gilbertoquintana/)
 * (@gilbertoquintana)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-4/#post-5962667)
 * I need help wanting to enter the administrator I get the following error:
 * PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback,
   function ‘wp_site_icon’ not found or invalid function name in D:\INETPUB\VHOSTS\
   elemento3.com\httpdocs\wp-includes\plugin.php on line 496
 *  [yorespectaf](https://wordpress.org/support/users/yorespectaf/)
 * (@yorespectaf)
 * [10 years, 4 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-4/#post-5962673)
 * get_template_part_includes/widgets/widget-about1212get_template_part_includes/
   widgets/widget-adsense1212get_template_part_includes/widgets/widget-ads1212
    
   Warning: call_user_func_array() expects parameter 1 to be a valid callback, function‘
   wp_site_icon’ not found or invalid function name in /home4/MYusername/public_html/
   Die-Erfahrung.com/wp-includes/plugin.php on line 525 Die Erfahrung i have this
   problem on my site on my admin area. can someone help me ?

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘call_user_func_array() expects parameter 1 to be a valid callback’ is
closed to new replies.

 * 5 replies
 * 3 participants
 * Last reply from: [yorespectaf](https://wordpress.org/support/users/yorespectaf/)
 * Last activity: [10 years, 4 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-4/#post-5962673)
 * Status: not resolved

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