如何计算PHP中相同数组值的总和

Question

I have an array like this

$estimate[0]=>
'gear' =>'MMG'
'total' =>  315
   'efforts' => 9
   'afh' => 18

$estimate[1]=>
    'gear' =>'MMG'
    'total' =>  400
       'efforts' => 2
       'afh' => 6

$estimate[2]=>
    'gear' =>'BOO'
    'total' =>  200
       'efforts' => 20
       'afh' => 16

$estimate[3]=>
    'gear' =>'BOB'
    'total' =>  250
       'efforts' => 20
       'afh' => 16

I want to calculate the sum of total, efforts and afh in which gear is same and it will be stored in the another array. Following my coding is working when the array (estimate) size is less than 5.

$calculate = array();   
for($et=0;$et<count($estimate);):   
if($et==0):
    $calculate[$et]['gear'] = $estimate[$et]['gear'];
    $calculate[$et]['total'] = $estimate[$et]['total'];
    $calculate[$et]['efforts'] = $estimate[$et]['efforts'];
    $calculate[$et]['afh'] = $estimate[$et]['afh'];                 
    goto loopend;
endif;
for($cet=0;$cet<count($calculate);$cet++):
    if($estimate[$et]['gear'] == $calculate[$cet]['gear']):
        $calculate[$cet]['total'] = $calculate[$cet]['total'] + $estimate[$et]['total'];
        $calculate[$cet]['efforts'] = $calculate[$cet]['efforts'] + $estimate[$et]['efforts'];
        $calculate[$cet]['afh']    = $calculate[$cet]['afh'] + $estimate[$et]['afh'];                       
        goto loopend;   
    endif;
endfor;
    $calculate[$et]['gear'] = $estimate[$et]['gear'];
    $calculate[$et]['total'] = $estimate[$et]['total'];
    $calculate[$et]['efforts'] = $estimate[$et]['efforts'];
    $calculate[$et]['afh'] = $estimate[$et]['afh'];                 
    goto loopend;
loopend:$et++;  
endfor; 

The coding is not working more than many gears. Sometimes it works. I can't find the issues. Please help me to solve the issues.

Answer 1

You might use array_reduce:

$result = array_reduce($estimate, function($carry, $item) {
    if (!isset($carry[$item["gear"]])) {
        $carry[$item["gear"]] = $item;
        return $carry;
    }

    $carry[$item["gear"]]["total"] += $item["total"];
    $carry[$item["gear"]]["efforts"] += $item["efforts"];
    $carry[$item["gear"]]["afh"] += $item["afh"];

    return $carry;
});

Demo