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;
}
```4
Use the match expression in PHP to print a string.4
Attributes are metadata that can be added to classes, properties, constants or methods.4
Which function signature is valid?5
PHP function with named and positional arguments.7
PHP code that throws an error.3
PHP code that throws a TypeError