PHP Snippet 1:
function foo(?Type $t) {
}
PHP Snippet 2:
$this->foo(new Type()); // ok
$this->foo(null); // ok
$this->foo(); // error
PHP Snippet 3:
function foo(Type $t = null) {
}
PHP Snippet 4:
function foo(?Type $t)
{
}
PHP Snippet 5:
function foo(Type $t = null) {
}
PHP Snippet 6:
interface FooInterface
{
function bar();
}
class Foo implements FooInterface
{
public function bar()
{
return 'i am an object';
}
}
class NullFoo implements FooInterface
{
public function bar()
{
return 'i am null (but you still can use my interface)';
}
}
PHP Snippet 7:
function bar_my_foo(FooInterface $foo)
{
if ($foo instanceof NullFoo) {
// special handling of null values may go here
}
echo $foo->bar();
}
bar_my_foo(new NullFoo);
PHP Snippet 8:
function foo(Type|null $param) {
var_dump($param);
}
foo(new Type()); // ok : object(Type)#1
foo(null); // ok : NULL
PHP Snippet 9:
if (trim($tables) != '')
{
//code
}
PHP Snippet 10:
public function custom_trim(?string $value)
{
return is_string($value) ? trim($value) : $value;
}
