apply_filters( 'widget_form_callback', array $instance, WP_Widget $widget )

Filters the widget instance’s settings before displaying the control form.

Description

Returning false effectively short-circuits display of the control form.

Used By	Description
wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php: WP_REST_Widget_Types_Controller::get_widget_form()	Returns the output of WP_Widget::form() when called with the provided instance. Used by encode_form_data() to preview a widget’s form.
wp-includes/class-wp-widget.php: WP_Widget::form_callback()	Generates the widget control form (Do NOT override).

Version	Description
2.8.0	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/widget_form_callback