Medium
What does this example show?
$b = 12;
echo $a ?? $b;
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3
Which function signature is valid?3
Check if a value is in an array in PHP3
Use the match expression in PHP to print a string.4
PHP function with named and positional arguments.4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```3
Attributes are metadata that can be added to classes, properties, constants or methods.7
PHP code that throws an error.