asebold asebold - 7 months ago 30
PHP Question

Wordpress not recognizing function during plugin activation

I get this error when I try to activate my plugin:

call_user_func_array() expects parameter 1 to be a valid callback, function 'fancy_lists_create_table' not found or invalid function name in /Applications/XAMPP/xamppfiles/htdocs/intranet/wp-includes/plugin.php on line 525

This was output from a plugin that debugs the "xxx characters of unexpected output" error that is commonly seen. I don't understand why the function isn't valid. Code below:

namespace fancy_lists;
register_activation_hook( __FILE__, 'fancy_lists_create_table' );

function fancy_lists_create_table(){
global $wpdb;

$table_name = $wpdb->prefix.'fancy_lists';

if($wpdb->get_var("SHOW TABLES LIKE '$table_name'") != $table_name) {

$charset_collate = $wpdb->get_charset_collate();

$sql = "CREATE TABLE $table_name (
id mediumint(9) NOT NULL AUTO_INCREMENT,
created datetime DEFAULT NOW() NOT NULL,
created_by text NOT NULL,
list_name text NOT NULL,
column_config text NOT NULL,
permissions text NOT NULL,
notifications text NOT NULL,
UNIQUE KEY id (id)
) $charset_collate;";

require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
dbDelta( $sql );


Dan Dan

register_activation_hook() isn't aware of the namespace. You must specify it:

register_activation_hook( __FILE__, __NAMESPACE__ . '\fancy_lists_create_table' );