[Populate an ACF select field with Gravity Form ID] When all you need is the ID of a Gravity Form in an ACF select field, here's a basic solution that works very well, without having to use a full-blown Gravity Forms field plugin. Simply add a class of "gravity-form-select" to your field and it will be populated automatically. #gravityforms #wor…

functions.php

function my_acf_load_gravity_forms_select( $field ) {
    
	// This feels slightly hacky, but it works.
	//
	// If your select field has the wrapper class "gravity-form-select", 
	// it will be intercepted and any values will be replaced by a list of 
	// your form IDs and Titles.
	//
	// You could choose to intercept a select field with a specific name or 
	// field key, but I prefer this method because you can use it on multiple
	// fields with different names across your site.
  
	$field_class = $field['wrapper']['class'];
  	
	$gf_class = 'gravity-form-select'; // Add this class to your select field's wrapper.
    
	if(!empty($field_class) && strpos($field_class, $gf_class) !== false):

		if ( class_exists( 'GFFormsModel' ) ):

			$forms = GFAPI::get_forms();

			if ( $forms ):

				$field['choices'] = array();

				foreach ($forms as $f):

					$form_title = $f['title'];
					$form_id = $f['id'];

					// Add the form ID and Title to the 'choices' array.
					// On the front end, only the ID will be returned.
					$field['choices'][$form_id] = $form_title;

				endforeach;

			endif;

		endif;
	
	endif;

	return $field;
}

add_filter('acf/load_field/type=select', 'my_acf_load_gravity_forms_select');