method creation on generic object

[alber]

Hello.

 

I can define properties (data members) but I cant define a method for an object belongs to stdClass(generic) class.

 

for example :

 

$myObject = new stdClass();

 

$myObject->prop1 = "hello"; // works OK

 

function fun1()

{

echo "bye";

}

$myObject->method1 = fun1; // object accept the asignament

 

$myObject->metodo1();

 

the last sentence show an error :

server message :

 

Fatal error: Call to undefined method stdClass::metodo1() in /home/.../public_html/pru/objetos.php on line 63

 

 

Thanks for any help.

 

Alber

[waynew]

Are you sure that you've not made a mistake with your spelling:

 

$myObject->method1 = fun1; // object accept the asignament

 

$myObject->metodo1();

[Mchl]

$myObject->method1 = fun1; // object accept the asignament

 

No it doesn't. It just sets $myObject->method1 to "fun" (string) or assigns it a value of 'fun' constant if such constant is defined.

 

As far as I know you cannot add methods dynamically to an object.

[alber]

Are you sure that you've not made a mistake with your spelling:

 

$myObject->method1 = fun1; // object accept the asignament

 

$myObject->metodo1();

 

sorry. I want to translate to english and forgot change the "metodo1 to method1.

But the question in the same.

 

$myObject->method1(); //it doesn work

[alber]

$myObject->method1 = fun1; // object accept the asignament

 

No it doesn't. It just sets $myObject->method1 to "fun" (string) or assigns it a value of 'fun' constant if such constant is defined.

 

As far as I know you cannot add methods dynamically to an object.

 

bad news.

It is useful to define object without a custom class like in javascript.

 

thanks.

[Daniel0]

As far as I know you cannot add methods dynamically to an object.

 

class Foo {}

$foo = new Foo();
$foo->bar = function() {
echo 'test';
};

 

I wouldn't recommend that kind of code though.

 

It is useful to define object without a custom class like in javascript.

 

Javascript uses prototype based object orientation while PHP uses class based object orientation.

[mikesta707]

For the stdObject, I'm not sure. For your own defined class, you can use the magic __call method, and create a static registerMethod method to dynamically add functions. consider the following

class Dynamic {
//This is an array with all the classes methods. we can define the methods outside the class
  static protected $methods = array();

//this will register any method we want to the class, by adding it to the array
  public static function registerMethod($method) {
    self::$methods[] = $method;
  }

//this is where the "magic" happens. This function gets called when you call the method
//it will see if the function is in the methods array, and then call it
  private function __call($method, $args) {
    if (in_array($method, self::$methods)) {
      return call_user_func_array($method, $args);
    }
  }
}

//example

//define a simple function
function test() {
  print "Hello World";
}
//call our static method to add the test function to the class
Dynamic::registerMethod('test');
//instantiate the class
$d = new Dynamic();
//now call the method
$d->test();

 

if you wish to read more about it,  Here is where I got the idea from, and you can also view the rest of PHPs magic methods at the manual

 

As far as I know you cannot add methods dynamically to an object.

 

class Foo {}

$foo = new Foo();
$foo->bar = function() {
echo 'test';
};

 

I wouldn't recommend that kind of code though.

 

I actually tried something similar to this at first, and it didn't work. I copy pasted this also, and it doesn't work. error:

Parse error: syntax error, unexpected T_FUNCTION in C:\Server\htdocs\text.php on line 8

 

 

[salathe]

class Foo {}

$foo = new Foo();
$foo->bar = function() {
echo 'test';
};

 

Just to clarify (it might not be clear for the OP), Daniel's code still does not define the 'bar' method, it assigns an anonymous function to the bar property (which might be fine).

 

[Mchl]

I actually tried something similar to this at first, and it didn't work. I copy pasted this also, and it doesn't work. error:

Parse error: syntax error, unexpected T_FUNCTION in C:\Server\htdocs\text.php on line 8

 

Anonymous functions are available in PHP5.3+

[salathe]

class Foo {}

$foo = new Foo();
$foo->bar = function() {
echo 'test';
};

 

Also note that you won't be able to call $foo->bar() — you need to use call_user_func($foo->bar) or $foo->bar->__invoke()

[mikesta707]

I actually tried something similar to this at first, and it didn't work. I copy pasted this also, and it doesn't work. error:

Parse error: syntax error, unexpected T_FUNCTION in C:\Server\htdocs\text.php on line 8

 

Anonymous functions are available in PHP5.3+

 

ahh ok. I always wondered when they would add those in.

[Daniel0]

Also note that you won't be able to call $foo->bar() — you need to use call_user_func($foo->bar) or $foo->bar->__invoke()

 

Yeah, but to be honest, I consider that a bug more than a feature. When $bar('something') is callable, then $foo->bar('something') should be as well (assuming both refer to anonymous functions).

[Mchl]

It also seems that method created this way can't use $this or self::

I'm toying with it right now, so I might be wrong

[salathe]

Yeah, but to be honest, I consider that a bug more than a feature. When $bar('something') is callable, then $foo->bar('something') should be as well (assuming both refer to anonymous functions).

 

It would be much more intuitive to be able to do that, I agree.

 

It also seems that method created this way can't use $this or self::

I'm toying with it right now, so I might be wrong

 

There is no concept of $this or self:: in these anonymous functions.  You could pass the object ($foo) through to the function (in place of $this) using use and have Foo:: (in place of self::) but it's not a pretty solution.

 

[Mchl]

Yeah...

Note to self: just don't do it.