如何在数组关联中求和相同键的值

<?php
$array = array(
    array('key' => 'A', 'value' => 1),
    array('key' => 'B', 'value' => 2),
    array('key' => 'A', 'value' => 3),
    array('key' => 'C', 'value' => 4),
    array('key' => 'B', 'value' => 5)
);

$sums = array();
foreach ($array as $item) {
    $key = $item['key'];
    $value = $item['value'];
    
    if (isset($sums[$key])) {
        $sums[$key] += $value;
    } else {
        $sums[$key] = $value;
    }
}

print_r($sums);
?>

Array
(
    [A] => 4
    [B] => 7
    [C] => 4
)