- explode: documentation ( source)
<?php
$rec['birthday'] = '3/11/2001';
$date = explode('/', $rec['birthday']);
if(!isset($date[2])){
$new_date = $date[0].'-'.$date[1].'-'.'0000';
}
else{
$new_date = $date[0].'-'.$date[1].'-'.$date[2];
}
echo $new_date;