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<?php
// Define the 'class' class
$class = Obj()
->fn('new', function ($class) {
$newClass = Obj($class->methods)
->fn('new', function($class) {
$obj = Obj($class->imethods);
$args = func_get_args();
array_shift($args);
call_user_func_array(array($obj, 'init'), $args);
return $obj;
});
return $newClass;
})
->fn('def', function ($t, $name, $fn) {
$t->imethods[$name] = $fn;
return $t;
})
->fn('extend', function ($t) {
return clone $t;
});
// Define a new class
$animal = $class->new()
->def('init', function($t, $name) {
$t->name = $name;
})
->def('speak', function($t) {
echo "My name is $t->name\n";
});
// Extend a class
$dog = $animal->extend()
->def('speak', function($t) {
echo "My name is $t->name, I have just met you and I love you, SQUIRREL!\n";
})
->def('bark', function($t) {
echo "Woof!\n";
});
$jimmy = $animal->new('Jimmy');
$jimmy->speak();
$doug = $dog->new('Doug');
$doug->speak();
$doug->bark();
// ---- The guts...
class Obj
{
public function __construct($methods=array())
{
$this->methods = $methods;
}
public function method($name)
{
if (!isset($this->methods[$name]))
throw new BadMethodCallException();
return $this->methods[$name];
}
public function fn($name, $fn)
{
$this->methods[$name] = $fn;
return $this;
}
public function __call($name, $args)
{
return call_user_func_array(
$this->method($name),
array_merge(array($this), $args)
);
}
}
// Allow chaining method calls off the constructor..
function Obj($methods=array())
{
return new Obj($methods);
}

You come from a js background, right?

klang commented Sep 22, 2010

php 5.3 ?

This is interesting but the only problem is that PHP does not allow Closure serialisation.... so these classes won't be serializable....
To prevent this problem we would have to clean the 'methods' property when serializing and rebuild it on when unserializing.

Owner

dhotson commented Sep 22, 2010

Yep, PHP 5.3 only sorry.

Ah yeah, it really sucks that you can't serialise objects with closures. :-(
To be fair, you run into the same problem in Javascript.

klang commented Sep 22, 2010

yeah .. 5.3 .. I am actually looking forward to the day we upgrade our production environment to that version .. it's going to be a total map/reduce party!

Owner

dhotson commented Sep 22, 2010

Heh.. it's funny you should mention that. We recently deployed 5.3 on our production servers, which led me to thinking about what kind of crazy evil stuff I could implement using closures. This is the result.

a good amount of overhead, but you can get around the serialization problem via:
http://github.com/jeremeamia/super_closure

Owner

dhotson commented Sep 22, 2010

Hah, that's a pretty cool hack. /impressed

very interesting!

Jalopy commented Sep 22, 2010

I like it :)

brennen commented Sep 23, 2010

Neat.

Very cool, could be a good way to implement inceptors, sequences. tried an implementation http://gist.github.com/594135/ haven't tested it at all though

Gorcyn commented Sep 24, 2010

Definitely not OO !

Cool stuff!

Forked with view to providing a replacement for StdClass that allows you to attach callable methods to.

igorzg commented Sep 16, 2013

This pattern is mostly used in javascript.

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