Medium
What does this code display?
<?php
echo $a?->b() ?? 'test';
Edit
-1
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4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```8
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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.