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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
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```5
PHP function with named and positional arguments.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
Which function signature is valid?4
Use the match expression in PHP to print a string.