Medium
What does this example show?
$b = 12;
echo $a ?? $b;
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7
PHP code that throws an error.5
Check if a value is in an array in PHP4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```4
Attributes are metadata that can be added to classes, properties, constants or methods.5
Which function signature is valid?5
PHP function with named and positional arguments.4
Use the match expression in PHP to print a string.