- print_r: documentation ( source)
- implode: documentation ( source)
- explode: documentation ( source)
- define: documentation ( source)
<?php
$array = array('a'=>'lastname', 'b'=>'email', 'c'=>'phone');
echo implode(',', $array);
define('DEFAULT_ROLES', implode (',' , $array));
echo '<pre>';
print_r(explode(',' ,DEFAULT_ROLES ));