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<?php class Foo { private ?int $foo; private ?int $bar = 1; private ?int $baz = null; public function propertyInitialized($name): bool { if (property_exists($this, $name)) { try { return $this->$name === null || $this->$name !== null; } Catch(Error $e) { return false; } } else { return false; } } } $foo = new foo; var_dump($foo->propertyInitialized('foo'), $foo->propertyInitialized('bar'), $foo->propertyInitialized('baz'), $foo->propertyInitialized('doesNotExist'));
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
bool(false) bool(true) bool(true) bool(false)
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Parse error: syntax error, unexpected '?', expecting function (T_FUNCTION) or const (T_CONST) in /in/XSJHV on line 4
Process exited with code 255.
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