define a closure as method from class
- by user272839
Hi,
i'm trying to play with php5.3 and closure.
I see here (Listing 7. Closure inside an object : http://www.ibm.com/developerworks/opensource/library/os-php-5.3new2/index.html) that it's possible to use $this in the callback function, but it's not. So I try to give $this as use variable :
$self = $this;
$foo = function() use($self) { //do something with $self }
So to use the same example :
class Dog
{
private $_name;
protected $_color;
public function __construct($name, $color)
{
$this->_name = $name;
$this->_color = $color;
}
public function greet($greeting)
{
$self = $this;
return function() use ($greeting, $self) {
echo "$greeting, I am a {$self->_color} dog named {$self->_name}.";
};
}
}
$dog = new Dog("Rover","red");
$dog->greet("Hello");
Output:
Hello, I am a red dog named Rover.
First of all this example does not print the string but return the function, but that's not my problem.
Secondly I can't access to private or protected, because the callback function is a global function and not in the context from the Dog object. Tha't my problem. It's the same as :
function greet($greeting, $object) {
echo "$greeting, I am a {$self->_color} dog named {$self->_name}.";
}
And I want :
public function greet($greeting) {
echo "$greeting, I am a {$self->_color} dog named {$self->_name}.";
}
Which is from Dog and not global.
I hope that I am clear ...
