php匿名函数和闭包

leokim / / PHP, 技术, 设计模式
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<?php
 
class Product{
    public $name;
    public $price;
 
    function __construct($name, $price){
        $this->name = $name;
        $this->price = $price;
    }
}
 
class ProcessSale{
    private $callbacks;
 
    function registerCallback($callback){
        if(!is_callable($callback)){
            throw new Exception("allback not callable");
        }
 
        $this->callbacks[] = $callback;
    }  
 
    function sale($product){
        print "{$product->name}:processing \n";
        foreach ($this->callbacks as $callback) {
            call_user_func($callback, $product);
        }
    }
}
 
class Mailer{
    function doMail($product){
        print "mailing({$product->name})<br/>";
    }
}
 
class Totalizer{
    static function warnAmount($amt){
        $count = 0;
        // return function ($product){
        //     if($product->price > 5){
        //         print "reached high price: {$product->price}<br />";
        //     }
        // };
        return function ($product) use ($amt, &$count){
            $count += $product->price;
            print "count: $count <br />";
            if($count > $amt){
                print "high price reached:{$count} <br>";
            }
        };
    }
}
 
 
 
 
 
// $logger = create_function('$product',
//                           'print "logging({$product->name})\n";' );
 
// $logger2 = function($product){
//     print "logging ({$product->name})<br/>";
// };
 
$processor = new ProcessSale();
// $processor->registerCallback($logger2);
// $processor->registerCallback(array( new Mailer(), "doMail"));
$processor->registerCallback(Totalizer::warnAmount(8));
 
$processor->sale( new Product("shose", 6));
print "<br>";
$processor->sale( new Product("coffee", 6));
 
 
?>