匿名函数-

PHP回调与匿名函数实践

最新推荐文章于 2021-11-30 09:26:39 发布

原创最新推荐文章于 2021-11-30 09:26:39 发布 · 273 阅读

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本文探讨了PHP中使用回调函数和匿名函数进行产品销售处理的实际应用。通过具体示例，展示了如何创建产品类和销售处理类，以及如何注册和使用回调函数来处理不同产品的销售流程。同时，对比了传统create_function()与现代匿名函数的用法。

<?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("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";');
//create_function ??????
$processor =new ProcessSale();
$processor->registerCallback($logger);
$processor->sale(new Product("shoes", 6));
print "\n";
$processor->sale(new Product("coffee", 6));

//??? php5.3+
print "-------------------------\n";
$logger2 = function($product){
  print "loggin({$product->name}) \n";
};
$processor =new ProcessSale();
$processor->registerCallback($logger2);
$processor->sale(new Product("shoes2", 3));
print "\n";
$processor->sale(new Product("coffee2", 3));

print "-------------------------\n";