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run code in 500+ PHP versions simultaneously
<?php $array = [ '71-ctns' => 1, '71-units' => 1, '308-units' => 1, '305-ctns' => 1, '306-units' => 2, ]; $result = []; foreach ($array as $k => $v) { [$id, $label] = explode('-', $k); $result[$id][$label] = $v; } var_export($result);

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70.91 ms | 1036 KiB | 5 Q