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@ 2018-10-08T11:04:03Z

<?php
$total = array('01:00:00','02:20:00','04:00','05:10');
$sum = strtotime('00:00:00');
 $sum2=0;  
 foreach ($total as $v){

        $sum1=strtotime($v)-$sum;

        $sum2 = $sum2+$sum1;
    }

    $sum3=$sum+$sum2;

    echo date("H:i:s",$sum3);

Output
Performance
VLD
References
Branches

date: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

27.76 ms | 405 KiB | 5 Q