How does the behavior of isset differ when testing properties in Closure objects compared to other objects in PHP?

When testing properties in Closure objects, the behavior of isset differs from testing properties in other objects in PHP. This is because Closure objects do not allow direct access to their properties. Instead, you need to use the `use` keyword to access variables from the parent scope within the Closure. To check if a property is set in a Closure object, you need to use a different approach compared to regular objects. 

$property = 'example';
$closure = function() use ($property) {
    return isset($property);
};

var_dump($closure()); // Outputs: bool(true) or bool(false) depending on whether $property is set

Keywords

isset properties Closure objects objects PHP

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