替换多维数组中的值 - php

I need to replace all the total values with the corresponding subtraction of start and end values. Values are come from a sql result Any help how to do that? For Ex :

12.30 - 5.00 = 7.30

15.30 - 7.00 = 8.30

16.30 - 9.00 = 7.30

Existing array

array(184) {
   [1]=>
      array(3) {
         ["start"]=>
         string(4) "5.00"
         ["end"]=>
         string(4) "12.30"
         ["total"]=>
         string(4) "1.00"
      }
   [2]=>
      array(3) {
         ["start"]=>
         string(4) "7.00"
         ["end"]=>
         string(4) "15.30"
         ["total"]=>
         string(4) "1.00"
      }
   [3]=>
      array(3) {
         ["start"]=>
         string(4) "9.00"
         ["end"]=>
         string(4) "16.30"
         ["total"]=>
         string(4) "1.00"
      }
    ... // more records are there
 }

Replaced final array

 array(184) {
    [1]=>
       array(3) {
        ["start"]=>
        string(4) "5.00"
        ["end"]=>
        string(4) "12.30"
        ["total"]=>
        string(4) "7.30"
    }
    [2]=>
      array(3) {
        ["start"]=>
        string(4) "7.00"
        ["end"]=>
        string(4) "15.30"
        ["total"]=>
        string(4) "8.30"
   }
   [3]=>
     array(3) {
       ["start"]=>
       string(4) "9.00"
       ["end"]=>
       string(4) "16.30"
       ["total"]=>
       string(4) "7.30"
   }
... // more records are there
 }

Add this function to your code:

function timeDiff($first, $second) {
    return str_replace(':', '.', 
        strtotime(str_replace('.', ':', $second)) - 
        strtotime(str_replace('.', ':', $first))
    );
}

Then assign your array to $array variable and use code provided in Akam's answer, just change y-x to timeDiff(x,y):

foreach($array as &$v){
    $v['total'] = timeDiff($v['start'], $v['end']);
}

That should do the trick :)

Try this:

foreach($array as &$v){
 $v['total'] = $v['end']-$v['start'];
}

You can do like what @Akam suggest or you can do the long way

    $array = array(
        array('start' => '5.00', 'end' => '12.30', 'total' => '1.00'),
        array('start' => '7.00', 'end' => '15.30', 'total' => '1.00'),
        array('start' => '9.00', 'end' => '16.30', 'total' => '1.00'),
   );

    array_walk($array, 
        function(&$arr) { 
           $arr['total'] = $arr['end'] - $arr['start']; 
        }
    );

   var_dump($array);

Try with this

$array = array(
        array('start' => '5.00', 'end' => '12.30', 'total' => '1.00'),
        array('start' => '7.00', 'end' => '15.30', 'total' => '1.00'),
        array('start' => '9.00', 'end' => '16.30', 'total' => '1.00'),
   );

foreach($array as $key=>$val){
     $array[$key]['total'] = $val['start']+$val['end'];
 }

 var_dump($array);

 for($i=1; $i<= count($my_array); $i++){

        $end= str_replace('.',':',$my_array[$i]['end']);
        $start = str_replace('.',':',$my_array[$i]['start']);

        $my_array[$i]['total']  =gmdate("H:i",strtotime($end)-strtotime($start));
    }

Here I used the for loop to change all the occurrences in my array. And finally print it in the H:i format.