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<?php 
/**
 * Populate ACF select field options with Gravity Forms forms
 */
 
 function acf_populate_gf_forms_ids( $field ) {
	if ( class_exists( 'GFFormsModel' ) ) {
		$choices = [];
		$choices[0] = 'Bitte Formular aussuchen...';
			foreach ( \GFFormsModel::get_forms() as $form ) {
			$choices[ $form->id ] = $form->title;
		}
		$field['choices'] = $choices;
	}
	return $field;
}
add_filter( 'acf/load_field/name=gf_anmeldeformular', 'acf_populate_gf_forms_ids' );
?>