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@ 2019-08-26T10:40:05Z

<?php

$array_origin = [
    [
        "id" => 1,
        "category"=>1
    ],

    [
        "id" => 2,
        "category"=>2
    ],
];

$array_origin = array_reduce($array_origin, static function($carry, $item) {
    $carry[] = $item;
    
    if ($item['category'] === 1) {
        $item['category'] = 2;
        $carry[] = $item;
    }
    
    return $carry;
}, []);

var_dump($array_origin);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_reduce: documentation ( source)

preferences:dark modelive previewkey bindings

30.71 ms | 405 KiB | 5 Q