chage_area.php

function volunteer_area_of_interest_validate($form, &$form_state) {
		// eCare vms new class object.
	global $user;
	
	$vms = variable_get('vms');
	$open_area_of_interest = $vms->getVoluntreeOpenTaskInterest($user->uid);

	$values = $form_state['values'];

	$account = user_load($user->uid);
	$profile = profile2_load_by_user($account, 'volunteer_profile');

	function default_vala($val) {
		return $val['nid'];
	}
	$default_Selected_areaofInterest  = array_map('default_vala', $profile->field_area_of_interest['und']);

	$open_interest = array();
	$user_area_open_interest = array();

	foreach ($open_area_of_interest as $k => $v) {
		
		$open_interest[$v] = 1;
		if (in_array($v, $default_Selected_areaofInterest) ) {
			array_push( $user_area_open_interest, $v);
		}
	}

	$new_values = $values['volunteer_area_of_interest'];
	foreach ($values['volunteer_area_of_interest'] as $value) {
		if ( array_key_exists($value, $open_interest) ) {
			array_push( $new_values, $value);
			
		}
	}

	$new_values = array_unique($new_values);

	foreach ($user_area_open_interest as $latesd) {
		if (!array_key_exists($latesd, $new_values )) {
			array_push( $new_values, $latesd);
		}
	}

	$new_values = array_unique($new_values);

	$form_state['values']['volunteer_area_of_interest'] = $new_values;

	return false;
}