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<?php function fib_rek($n) { if($n==0) { return 0; } if($n==1) { return 1; } return fib_rek($n-2) + fib_rek($n-1); } fib_rek(100);
based on oqX2b
Output for 5.3.9 - 7.1.0

Process exited with code 137.