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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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4
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PHP function with named and positional arguments.5
Which function signature is valid?4
Attributes are metadata that can be added to classes, properties, constants or methods.5
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Is this function signature valid?
```php
<?php
interface Demo
{ 
    public function bar(): ?mixed;
}
```7
PHP code that throws an error.