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run code in 200+ php & hhvm versions
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<?php echo nek(6); function nek($i) { if ($i <= 1) { echo "1 = "; return 1; } echo "$i *"; return $i * nek($i-1); }
Output for 4.3.0 - 7.2.0
6 *5 *4 *3 *2 *1 = 720