3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $arr = array('order_source' => array('google','facebook'), 'order_medium' => 'google-text'); function bqs($array, $qs='') { foreach($array as $par => $val) { if(is_array($val)) { bqs($val, $qs); } else { $qs .= $par.'='.$val.'&'; } } return $qs; } echo $qss = bqs($arr);
based on rvTSo
Output for 4.3.0 - 7.1.0
order_medium=google-text&