PHP.nl

Closure::bindTo

Closure::bindTo

Duplicates the closure with a new bound object and class scope

 **Closure::bindTo**  $newThis  $newScope

Create and return a new with the same body and bound variables as this one, but possibly with a different bound object and a new class scope. anonymous function

The “bound object” determines the value will have in the function body and the “class scope” represents a class which determines which private and protected members the anonymous function will be able to access. Namely, the members that will be visible are the same as if the anonymous function were a method of the class given as value of the parameter. $this``newScope

Static closures cannot have any bound object (the value of the parameter should be null), but this method can nevertheless be used to change their class scope. newThis

This method will ensure that for a non-static closure, having a bound instance will imply being scoped and vice-versa. To this end, non-static closures that are given a scope but a null instance are made static and non-static non-scoped closures that are given a non-null instance are scoped to an unspecified class.

Opmerking: > If you only want to duplicate the anonymous functions, you can use instead. cloning

newThisThe object to which the given anonymous function should be bound, or null for the closure to be unbound.

newScopeThe class scope to which the closure is to be associated, or 'static' to keep the current one. If an object is given, the type of the object will be used instead. This determines the visibility of protected and private methods of the bound object. It is not allowed to pass (an object of) an internal class as this parameter.

Returns the newly created object or null on failure. Closure

Voorbeeld: example

<?php

class A
{
    private $val;

    public function __construct($val)
    {
        $this->val = $val;
    }

    public function getClosure()
    {
        // Returns closure bound to this object and scope
        return function() {
            return $this->val;
        };
    }
}

$ob1 = new A(1);
$ob2 = new A(2);

$cl = $ob1->getClosure();
echo $cl(), "\n";

$cl = $cl->bindTo($ob2);
echo $cl(), "\n";

?>

1
2

Anonymous functionsClosure::bind

Vorige ← Closure::bind Volgende Closure::call →

Documentatie