Online PHP editor | output for b3KAi

@ 2020-10-04T06:27:43Z

<?php

$array = [
    ['_id' => '5f76b1788ee23077dccd1a2c', 'product' => ['_id'=>'5d0391a4a72ffe76b8fcc610'], 'count'=> 1],
    ['_id' => '5f76b6288ee2300700cd1a3a', 'product' => ['_id'=>'5d0391b6a72ffe76b8fcc611'], 'count'=> 1],
    ['_id' => '5f76d2488ee23083d3cd1a4a', 'product' => ['_id'=>'5d0391b6a72ffe76b8fcc611'], 'count'=> 1]
];

$productCounts = [];
foreach ($array as $item) {
    $productId = $item['product']['_id'];
    $productCounts[$productId] = ($productCounts[$productId] ?? 0) + $item['count'];
}

var_export($productCounts);

Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: array ( '5d0391a4a72ffe76b8fcc610' => 1, '5d0391b6a72ffe76b8fcc611' => 2, )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array ( '5d0391a4a72ffe76b8fcc610' => 1, '5d0391b6a72ffe76b8fcc611' => 2, )

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