3v4l.org

run code in 300+ PHP versions simultaneously
<?php function is_even(int $n): bool { $fn = null; $fn = static function(int $nr) use($fn): bool { if ($nr < 0) { $nr = abs($nr); } if ($nr === 0) { return true; } return $fn($nr - 1); } return $fn($n, false); } for($i = -5; $i <= 12; $i++) { printf('is %d even? %s.%s', $i, is_even($i) ? 'yes': 'no', "\n"); }
based on 2WBFO
Output for 8.0.0alpha3
Parse error: syntax error, unexpected token "return" in /in/Xtabs on line 17
Process exited with code 255.
Output for 7.2.0 - 7.2.32, 7.3.0 - 7.3.20, 7.4.0 - 7.4.8, 8.0.0alpha1 - alpha2
Parse error: syntax error, unexpected 'return' (T_RETURN) in /in/Xtabs on line 17
Process exited with code 255.