(PHP 5 >= 5.4.0)
Closure::bind — Duplicates a closure with a specific bound object and class scope
$closure
, object $newthis
[, mixed $newscope
= 'static'
] )This method is a static version of Closure::bindTo(). See the documentation of that method for more information.
closure
The anonymous functions to bind.
newthis
The object to which the given anonymous function should be bound, or
NULL for the closure to be unbound.
newscope
The class scope to which associate 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.
Returns a new Closure object 或者在失败时返回 FALSE
Example #1 Closure::bind() example
<?php
class A {
private static $sfoo = 1;
private $ifoo = 2;
}
$cl1 = static function() {
return A::$sfoo;
};
$cl2 = function() {
return $this->ifoo;
};
$bcl1 = Closure::bind($cl1, null, 'A');
$bcl2 = Closure::bind($cl2, new A(), 'A');
echo $bcl1(), "\n";
echo $bcl2(), "\n";
?>
以上例程的输出类似于：
1 2
Vincius Krolow (2012-12-14 00:08:20)
With this class and method, it's possible to do nice things, like add methods on the fly to an object.
MetaTrait.php
<?php
trait MetaTrait
{
private $methods = array();
public function addMethod($methodName, $methodCallable)
{
if (!is_callable($methodCallable)) {
throw new InvalidArgumentException('Second param must be callable');
}
$this->methods[$methodName] = Closure::bind($methodCallable, $this, get_class());
}
public function __call($methodName, array $args)
{
if (isset($this->methods[$methodName])) {
return call_user_func_array($this->methods[$methodName], $args);
}
throw RunTimeException('There is no method with the given name to call');
}
}
?>
test.php
<?php
require 'MetaTrait.php';
class HackThursday {
use MetaTrait;
private $dayOfWeek = 'Thursday';
}
$test = new HackThursday();
$test->addMethod('when', function () {
return $this->dayOfWeek;
});
echo $test->when();
?>