Add Total Entry Count for Nested Form Fields in Entry List View

<?php
/**
 * Gravity Perks // Nested Forms // Add Total Entry Count for Nested Form Fields in Entry List View
 * https://gravitywiz.com/documentation/gravity-forms-nested-forms/
 *
 * Instruction Video: https://www.loom.com/share/69eb4d65affa41c4a129a788047f41a7
 *
 * Add the total count of child entries for each Nested Form field in its label when viewed in the Entry List view.
 */
add_filter( 'gform_form_post_get_meta', function( $form ) {

	if ( GFForms::get_page() !== 'entry_list' ) {
		return $form;
	}

	foreach ( $form['fields'] as &$field ) {

		if ( $field->get_input_type() !== 'form' ) {
			continue;
		}

		// We just need the total via the $total variable set by reference.
		GFAPI::get_entries(
			$field->gpnfForm,
			array(
				'status'        => rgget( 'filter' ) ? rgget( 'filter' ) : 'active',
				'field_filters' => array(
					'mode' => 'all',
					array(
						'key'   => GPNF_Entry::ENTRY_NESTED_FORM_FIELD_KEY,
						'value' => $field->id,
					),
					// We don't want orphaned entries.
					array(
						'key'   => GPNF_Entry::ENTRY_EXP_KEY,
						'value' => null,
					),
				),
			),
			array(
				'key'        => 'id',
				'direction'  => 'ASC',
				'is_numeric' => true,
			),
			array(
				'offset'    => 0,
				'page_size' => 0,
			),
			$total
		);
		$field->label .= sprintf( ' (%d %s)', $total, strtolower( $total > 1 ? $field->get_items_label() : $field->get_item_label() ) );

	}

	return $form;
} );