PHP 回調、匿名函數和閉包

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<?phpclass 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("callback not callable");        }        $this->callbacks[] = $callback;    }        function sale($product){        print "{$product->name}:processing \n";        foreach ($this->callbacks as $callback){            call_user_func($callback, $product);        }    }}$logger = create_function(‘$product‘, ‘print "   logging ({$product->name})\n";‘);$processor = new ProcessSale();$processor->registerCallback($logger);$processor->sale(new Product("shoes", 6));print "\n";$processor->sale(new Product("coffee", 6));$logger2 = function($product){    print "  logging ({$product->name})\n";};$processor = new ProcessSale();$processor = new ProcessSale();$processor->registerCallback($logger2);$processor->sale(new Product("shoes", 6));print "\n";$processor->sale(new Product("coffee", 6));class Mailer{    function doMail($product){        print "  mailing ({$product->name})\n";    }}$processor = new ProcessSale();$processor->registerCallback(array(new Mailer(), "doMail"));$processor->sale(new Product("shoes", 6));print "\n";$processor->sale(new Product("coffee", 6));class Totalizer{    static function warnAmount(){        return function($product){            if ($product->price > 5){                print "  reached high price: {$product->price}\n";            }        };    }}$processor = new ProcessSale();$processor->registerCallback(Totalizer::warnAmount());//.....class TotalizerNew{    static function warnAmount($amt){        $count = 0;        return function($product) use ($amt, &$count){            $count += $product->price;            print "  count: $count\n";            if ($count > $amt){                print "  high price reached:{$count}\n";            }        };    }}$processor = new ProcessSale();$processor->registerCallback(TotalizerNew::warnAmount(8));$processor->sale(new Product("shoes", 6));print "\n";$processor->sale(new Product("coffee", 6));

 

PHP 回調、匿名函數和閉包