Misc builtins

Misc builtins

Function	Signature	Returns
buffer_new()	(int $length): mixed	mixed
define()	(string $constant_name, mixed $value): bool	bool
defined()	(string $constant_name): bool	bool
empty()	(mixed $value): bool	bool
header()	(string $header, bool $replace = true, int $response_code = 0): void	void
http_response_code()	(int $response_code = 0): int	int
isset()	(mixed $var, ...$vars): bool	bool
php_uname()	(string $mode = 'a'): string	string
phpversion()	(): string	string
print_r()	(mixed $value, bool $return = false): mixed	mixed
serialize()	(mixed $value): string	string
unserialize()	(string $data, mixed $options = []): mixed	mixed
unset()	(mixed $var, ...$vars): void	void
var_dump()	(mixed $value, ...$values): void	void