Online PHP editor | refs for ug0H2

@ 2020-08-03T14:34:00Z

<?php

$a = [[45, 16, 18, 72], [23, 8, 9, 36, 15, 36]];

$parts = [];
foreach ($a as $subarray) {
    $parts[] = '[' . implode(' ', $subarray) . ']';
}
echo '[' . implode(', ', $parts) . ']';