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What will it be displayed?
<?php
class Foo
{
public function getFullName()
{
return $this->getName() . ' surname';
}
final private function getName()
{
return 'name';
}
}
$foo = new Foo();
echo $foo->getFullName();
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5
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Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```