Medium
What does this example show?
$b = 12;
echo $a ?? $b;
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9
PHP code that throws an error.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.5
Check if a value is in an array in PHP5
Which function signature is valid?4
Attributes are metadata that can be added to classes, properties, constants or methods.5
PHP function with named and positional arguments.