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What does this code display?
<?php
echo $a?->b() ?? 'test';
0
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3
Use the match expression in PHP to print a string.3
Check if a value is in an array in PHP3
Attributes are metadata that can be added to classes, properties, constants or methods.4
PHP function with named and positional arguments.3
Which function signature is valid?4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```7
PHP code that throws an error.