ACF Group Fields

ACF Group Fields.php

<?php
/**
*  acf_group_fields
*
*  This function return an array of all the field names within a field group.
*
*  @type	function
*  @date	24/9/14
*  @since	5.0.8
*
*  @param	$id (int) The post_id of the field group
*  @return	$fields (array) Field names from group
*/
function acf_group_fields( $id ){

	$group = acf_get_fields( acf_get_field_group( $id ) ); 

	foreach( array_keys( $group ) as $i ) {
		$group_fields[] = acf_extract_var($group, $i);
	}

	foreach ($group_fields as $field){
		$fields[] = $field['key'];
	}

	return $fields;
}