Time Difference function between two time in php

 /*
     *#Auth: Amit Sharma
     *#Desc: Fucnction for Time difference
     *#Note: use 24 hours Format only
 */

//Start from here;

<?php

//Call a function:
returnTimeDifference("10:00","14:00");

//echo returnTimeDifference("10:00","14:00");

function returnTimeDifference($dtime,$atime)
{

    echo $dtime."-".$atime."
";
    $nextDay=$dtime>$atime?1:0;
     //use 1 to add for next day if time increases
   
    $dep=explode(':',$dtime);
    $arr=explode(':',$atime);
    // echo $dep[0];

    //use mktime function for two dates difference
    $diff=abs(MKTIME($dep[0],$dep[1],0,DATE('n'),DATE('j'),DATE('y'))-MKTIME($arr[0],$arr[1],0,DATE('n'),DATE('j')+$nextDay,DATE('y')));

    // echo DATE('y');//return code
     echo $diff."
";
     $hours=floor($diff/(60*60));
     $mins=floor(($diff-($hours*60*60))/(60));
     $secs=floor(($diff-(($hours*60*60)+($mins*60))));
   
     if(strlen($hours)<2){$hours="0".$hours;}
     if(strlen($mins)<2){$mins="0".$mins;}
     if(strlen($secs)<2){$secs="0".$secs;}

     return $hours.':'.$mins.':'.$secs;
   
}

?>