Medium
What does this example show?
$b = 12;
echo $a ?? $b;
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7
PHP code that throws an error.4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```3
PHP code that throws a TypeError3
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.