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Comment déclare-t-on une propriété dans une classe PHP ?
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4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```5
Which function signature is valid?5
Check if a value is in an array in PHP5
PHP function with named and positional arguments.9
PHP code that throws an error.4
Attributes are metadata that can be added to classes, properties, constants or methods.4
Use the match expression in PHP to print a string.