Medium
What does this example show?
$b = 12;
echo $a ?? $b;
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4
Attributes are metadata that can be added to classes, properties, constants or methods.4
Which function signature is valid?7
PHP code that throws an error.5
PHP function with named and positional arguments.3
PHP code that throws a TypeError4
Use the match expression in PHP to print a string.4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```