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What does this code display?
<?php
echo $a?->b() ?? 'test';
0
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4
Use the match expression in PHP to print a string.9
PHP code that throws an error.5
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
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```5
Which function signature is valid?