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run code in 300+ PHP versions simultaneously
<?php $a = ['number'=>777]; $b = []; for ($i = 0; $i < 50; ++$i) { $b += $a; $b[$i]['number'] = $i; } array_walk($b, function($val, $key) { echo '$b[' . $key . ']["number"] = ' . $val['number'] . PHP_EOL; });

preferences:
35.83 ms | 402 KiB | 5 Q