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<?php
$wek = array('mon'=>0, 'tue'=>1, 'wed'=>2);
$tmp = array();
foreach ( $rows as $row) {
    foreach ($wek as $k=>$v) {
        if (isset($row['d_schedule_item_'. $k])) {
            $tmp[$v][$row['d_schedule_time']] = $row['d_schedule_item_'. $k];
        }
    }
}