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What does this code display?
<?php
echo $a?->b() ?? 'test';
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4
Attributes are metadata that can be added to classes, properties, constants or methods.7
PHP code that throws an error.5
PHP function with named and positional arguments.4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```4
Use the match expression in PHP to print a string.4
Which function signature is valid?3
PHP code that throws a TypeError