PHP多维数组合并键并添加一个值

Question

My array is like this :

array(  
    (int) 0 => array(
    'projet_id' => '1',
    'activite_id' => '1',
    'domaine_id' => null,
    'aretirer' => (float) 4
),  
(int) 1 => array(
        'projet_id' => '1',
        'activite_id' => '3',
        'domaine_id' => null,
        'aretirer' => (float) 1
    ),  
(int) 2 => array(
        'projet_id' => '1',
        'activite_id' => '1',
        'domaine_id' => null,
        'aretirer' => (float) 2
    ),  
(int) 3 => array(
        'projet_id' => '1',
        'activite_id' => '3',
        'domaine_id' => null,
        'aretirer' => (float) 2
    )
)

I want to sum the aretirer key where projet_id,activite_id and domaine_id are the same

I tried with foreach but i haven't got the good result like this

array(  
(int) 0 => array(
        'projet_id' => '1',
        'activite_id' => '1',
        'domaine_id' => null,
        'aretirer' => (float) 6
    ),  
(int) 1 => array(
        'projet_id' => '1',
        'activite_id' => '3',
        'domaine_id' => null,
        'aretirer' => (float) 3
    )
)

thats what i tried to do

public function array_sum($array){
    $arrayfusion=array();
    $i=0;
    foreach($array as $item):
        $arrayfusion[$i]['projet_id']=$item['projet_id'];
        $arrayfusion[$i]['activite_id']=$item['activite_id'];
        $arrayfusion[$i]['domaine_id']=$item['domaine_id'];   
        $arrayfusion[$i]['aretirer']=$item['aretirer']; 
        foreach($array as $itemnext):
            if($itemnext['projet_id']==$item['projet_id'] && $itemnext['activite_id']==$item['activite_id'] && $itemnext['domaine_id']==$item['domaine_id']):
                $arrayfusion[$i]['aretirer']+=$itemnext['aretirer']; 
            endif;
        endforeach;
        $i++;
    endforeach;
    return $arrayfusion;
}

thank's for your help

Answer 1

$array = array(  
    array(
        'projet_id' => '1',
        'activite_id' => '1',
        'domaine_id' => null,
        'aretirer' =>  4
    ),  
    array(
        'projet_id' => '1',
        'activite_id' => '3',
        'domaine_id' => null,
        'aretirer' =>  1
    ),  
    array(
        'projet_id' => '1',
        'activite_id' => '1',
        'domaine_id' => null,
        'aretirer' => 2
    ),  
    array(
        'projet_id' => '1',
        'activite_id' => '3',
        'domaine_id' => null,
        'aretirer' => 2
    )
);

$sortedArray = array();
$assignedValues = array();

foreach ($array as $arrayItem)
{
    $ukey = $arrayItem['projet_id'].'-'.$arrayItem['activite_id'].'-'.$arrayItem['domaine_id'];


    if (!isset($sortedArray[$ukey]))
    {
        $sortedArray[$ukey] = array();
    }

    $sortedArray[$ukey][] = $arrayItem['aretirer'];

    if (!isset($assignedValues[$ukey]))
    {
        $assignedValues[$ukey] = array(
            'projet_id' => $arrayItem['projet_id'],
            'activite_id' => $arrayItem['activite_id'],
            'domaine_id' => $arrayItem['domaine_id']
        );
    }
}

foreach ($sortedArray as $ukey => $arrayItem)
{
    $sum = array_sum($arrayItem);

    var_dump($assignedValues[$ukey]);
    var_dump('SUM: ' . $sum);
}

UPDATE: added separator