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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.9
PHP code that throws an error.5
PHP function with named and positional arguments.5
Which function signature is valid?5
Check if a value is in an array in PHP4
Use the match expression in PHP to print a string.4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```