Medium
What does this example show?
$b = 12;
echo $a ?? $b;
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4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```7
PHP code that throws an error.5
PHP function with named and positional arguments.4
Which function signature is valid?4
Attributes are metadata that can be added to classes, properties, constants or methods.4
Use the match expression in PHP to print a string.3
PHP code that throws a TypeError