邢栋博客

<?php

//php回调、匿名函数、闭包 事例

class Product{

public $name;

public $price;

function __CONSTRUCT($name,$price){

$this->name = $name;

$this->price = $price;

}

}

class ProcessSale{

private $callbacks;

public function registerCallback($callback){

if(!is_callable($callback)){

throw new Exception("Error Processing Request", 1);

}

$this->callbacks[] = $callback;

}

public function sale($product){

print "{$product->name}:Processing <br>";

foreach ($this->callbacks as $callback) {

call_user_func($callback,$product);

}

}

}

class Totalizer{

static function warnAmount($amt){

$count = 0;

return function ($product) use ($amt,&$count){

$count += $product->price;

print "count : $count <br>";

if($count > $amt){

print "high price reached: {$count} <br>";

}

};

}

}

$processor = new ProcessSale();

$processor->registerCallback(Totalizer::warnAmount(8));

$processor->sale(new Product("shoes",6));

$processor->sale(new Product("coffes",6));