Calling closure assigned to object property directly

by

As of PHP7, you can do

$obj = new StdClass;
$obj->fn = function($arg) { return "Hello $arg"; };
echo ($obj->fn)('World');

or use Closure::call(), though that doesn’t work on a StdClass.

Before PHP7, you’d have to implement the magic __call method to intercept the call and invoke the callback (which is not possible for StdClass of course, because you cannot add the __call method)

class Foo
{
    public function __call($method, $args)
    {
        if(is_callable(array($this, $method))) {
            return call_user_func_array($this->$method, $args);
        }
        // else throw exception
    }
}

$foo = new Foo;
$foo->cb = function($who) { return "Hello $who"; };
echo $foo->cb('World');

Note that you cannot do

return call_user_func_array(array($this, $method), $args);

in the __call body, because this would trigger __call in an infinite loop.

More Related Contents:

  1. How can I access an array/object?
  2. How to access object properties with names like integers or invalid property names?
  3. Get a PHP object property that is a number [duplicate]
  4. How to create new property dynamically
  5. Access object property with disallowed character in property name
  6. How can I access object properties with names like integers or invalid property names?
  7. How to get WooCommerce order details
  8. PHP Fatal error: Using $this when not in object context
  9. Property Property Property [title] does not exist on this collection instance does not exist on this collection instance does not exist on this collection instance
  10. Modify array values in foreach loop
  11. What is the best method to merge two PHP objects?
  12. Get PHP class property by string
  13. PHP: Storing ‘objects’ inside the $_SESSION
  14. Accessing outside variable using anonymous function as params
  15. Trying to get property of non-object in [duplicate]
  16. How can I access a property with an invalid name?
  17. PHP OOP core framework
  18. Accessing Class Properties with Spaces
  19. How can I access an object attribute that starts with a number?
  20. PHP check whether property exists in object or class
  21. Is it possible to delete an object’s property in PHP?
  22. How can I access a deep object property named as a variable (dot notation) in php?
  23. Access variables from parent scope in anonymous PHP function
  24. Array to Object and Object to Array in PHP – interesting behaviour
  25. Anonymous recursive PHP functions
  26. How to call a closure that is a class variable?
  27. Syntax error while defining an array as a property of a class
  28. How do you pass objects by reference in PHP 5?
  29. Use keyword in functions – PHP [duplicate]
  30. what is Object Cloning in php?

Leave a Comment