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What are WeakMap data structures?
Author: W3D TeamStatus: PublishedQuestion passed 1136 times
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Which function signature is valid?5
PHP function with named and positional arguments.4
Attributes are metadata that can be added to classes, properties, constants or methods.4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```4
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PHP code that throws an error.