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<?php function is_even(int $n): bool { $fn = null; $fn = fn(int $nr, bool $not): bool => $nr === 0 ? !$not : $fn(($nr < 0 ? abs($nr) : $nr) - 1, !$not); return $fn($n, false); } for($i = -5; $i <= 12; $i++) { printf('is %d even? %s.%s', $i, is_even($i) ? 'yes': 'no', "\n"); }
Output for 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 - 8.3.7
Fatal error: Uncaught Error: Value of type null is not callable in /in/2WBFO:5 Stack trace: #0 /in/2WBFO(7): {closure}(-5, false) #1 /in/2WBFO(11): is_even(-5) #2 {main} thrown in /in/2WBFO on line 5
Process exited with code 255.
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 Fatal error: Uncaught Error: Value of type null is not callable in /in/2WBFO:5 Stack trace: #0 /in/2WBFO(7): {closure}(-5, false) #1 /in/2WBFO(11): is_even(-5) #2 {main} thrown in /in/2WBFO on line 5
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Function name must be a string in /in/2WBFO:5 Stack trace: #0 /in/2WBFO(7): {closure}(-5, false) #1 /in/2WBFO(11): is_even(-5) #2 {main} thrown in /in/2WBFO on line 5
Process exited with code 255.
Output for 7.3.0 - 7.3.33
Parse error: syntax error, unexpected '$nr' (T_VARIABLE), expecting ')' in /in/2WBFO on line 5
Process exited with code 255.
Output for 7.2.0 - 7.2.33
Parse error: syntax error, unexpected '$nr' (T_VARIABLE), expecting ',' or ')' in /in/2WBFO on line 5
Process exited with code 255.
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