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<?php function is_even(int $n): bool { if ($n < 0) { $n = abs($n); } return $n === 0 ? true : ($n === 1 ? false : (is_even($n - 2))); } for($i = -5; $i <= 12; $i++) { printf('is %d even? %s.%s', $i, is_even($i) ? 'yes': 'no', "\n"); }
Output for 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
is -5 even? no. is -4 even? yes. is -3 even? no. is -2 even? yes. is -1 even? no. is 0 even? yes. is 1 even? no. is 2 even? yes. is 3 even? no. is 4 even? yes. is 5 even? no. is 6 even? yes. is 7 even? no. is 8 even? yes. is 9 even? no. is 10 even? yes. is 11 even? no. is 12 even? yes.
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 is -5 even? no. is -4 even? yes. is -3 even? no. is -2 even? yes. is -1 even? no. is 0 even? yes. is 1 even? no. is 2 even? yes. is 3 even? no. is 4 even? yes. is 5 even? no. is 6 even? yes. is 7 even? no. is 8 even? yes. is 9 even? no. is 10 even? yes. is 11 even? no. is 12 even? yes.
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175.51 ms | 402 KiB | 181 Q