WP_List_Table::__isset() │ public │ WP 4.0.0

Makes private properties checkable for backward compatibility.

Method of the class: WP_List_Table{}

No Hooks.

Return

true|false. Whether the property is a back-compat property and it is set.

Usage

$WP_List_Table = new WP_List_Table();
$WP_List_Table->__isset( $name );
$name(string) (required)
Property to check if set.

Changelog

Since 4.0.0 Introduced.
Since 6.4.0 Checking a dynamic property is deprecated.

WP_List_Table::__isset() code WP 6.6.2

wp-admin/includes/class-wp-list-table.php 
public function __isset( $name ) {
	if ( in_array( $name, $this->compat_fields, true ) ) {
		return isset( $this->$name );
	}

	wp_trigger_error(
		__METHOD__,
		"The property `{$name}` is not declared. Checking `isset()` on a dynamic property " .
		'is deprecated since version 6.4.0! Instead, declare the property on the class.',
		E_USER_DEPRECATED
	);
	return false;
}