Hard
What does this code display?
<?php
echo $a?->b() ?? 'test';
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4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```5
Check if a value is in an array in PHP4
Attributes are metadata that can be added to classes, properties, constants or methods.5
PHP function with named and positional arguments.4
Use the match expression in PHP to print a string.5
Which function signature is valid?7
PHP code that throws an error.