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run code in 150+ php & hhvm versions
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<?php function nek($i) { if ($i <= 1) { echo "1 = "; return 1; } echo "$i * "; return $i * nek($i-1); } echo nek(10);
Output for 4.3.0 - 7.1.0
10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 3628800