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Which of the following PHP versions introduced typed class constants ?
Author: nambininaStatus: PublishedQuestion passed 48 times
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PHP code that throws an error.5
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Attributes are metadata that can be added to classes, properties, constants or methods.5
Which function signature is valid?5
PHP function with named and positional arguments.4
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Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```