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<?php function fib($n) { return ((4 << $n*(3+$n)) / ((4 << 2*$n) - (2 << $n) - 1) & ((2 << $n) - 1)); } for ($i = 10; $i < 20; $i++) { echo "Fib {$i}: " . fib($i) . "\n"; }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Fib 10: 0 Fib 11: 0 Fib 12: 0 Fib 13: 0 Fib 14: 0 Fib 15: 0 Fib 16: 0 Fib 17: 0 Fib 18: 0 Fib 19: 0
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fib 10: 0 Fib 11: 0 Fib 12: 0 Fib 13: 0 Fib 14: 0 Fib 15: 0 Fib 16: 0 Fib 17: 0 Fib 18: 0 Fib 19: 0
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28
Fib 10: 0 Fib 11: 16 Fib 12: 8 Fib 13: 0 Fib 14: 8 Fib 15: 0 Fib 16: 65536 Fib 17: 0 Fib 18: 8 Fib 19: 0
preferences:
186.37 ms | 402 KiB | 229 Q