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What does this code display?
<?php
echo $a?->b() ?? 'test';
0
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7
PHP code that throws an error.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.4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```