chunk array and group a new one
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<?php
$arr = [
'001', 1, '002', 2, '003', 3, '004', 4
];
$result = [];
$groups = array_chunk($arr, 2);
foreach($groups as $group) {
$result[] = [
'id' => $group[0],
'num' => $group[1],
];
}
print_r($result);
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