gistfile1.txt

$data = [
	'recipientLists' => 'toPatientNoEmail',
	'template' => 'toPatientNoEmail',
	'vars' => [
		'username' => '20161130-27821',
		'name' => 'Aditya',
		'role' => 'Provider',
		'added_from' => 'Ketan',
		'facility_name' => 'Happy Hippo Clinic'
	]
];

foreach ($data['vars'] as $key) {
           $key = substr($key, 0, 5);
            debug($key);
        }
        debug($data); exit;