If I have a class like:
class MyClass
{
public function foo()
{
echo "foo";
}
}
And then outside of the class instantiate it and try to create an anonymous function in it:
$mine = new MyClass();
$mine->bar = function() {
echo "bar";
}
And then try to call it like $mine->bar()
, I get:
Fatal error: Call to undefined method MyClass::bar() in ...
How can I create an anonymous function / closure on a class instance?
Aside: Before you tell me I should rethink my logic or use interfaces and OOP properly, in my case, it's a convenience method that applies to this specific instance of a bastardized class in an attempt to clean-up a legacy procedural application. And yes, I'm using PHP 5.3+
See my blog article here: http://blog.flowl.info/2013/php-container-class-anonymous-function-lambda-support/
You need to add a magic __call
function:
public function __call($func, $args) {
return call_user_func($this->$func, $args);
}
The problem is that within this construct you can call private methods from public scope. I suggest not to simply add new variables to a class that are not defined . You can avoid this using magic __set
functions and catch all undefined variables in a container (= array, like in my blog post) and change the call_user_func behaviour to call only inside the array:
// inside class:
public $members = array();
public function __call($func, $args) {
// note the difference of calling only inside members:
return call_user_func($this->members[$func], $args);
}
__call
This will work.
class Foo {
public $bar;
public function __construct()
{
$this->bar = function()
{
echo 'closure called';
};
$this->bar();
}
public function __call($method, $args) {
return call_user_func($this->$method, $args);
}
}
new Foo();
The function IS being created. PHP has a problem with calling it.
Dirty, but works:
$f = $mine->bar;
$f();
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