PHP callback method_PHP tutorial

Callback, no need to explain, let’s take a look at how to implement callback in PHP

1. First create an object
class Product{
public $name; //For convenience of testing

function __construct($name){
$this->name=$name;
}
}

2. Use callbacks
class ProcessSale{
private $callbacks;

//Set callback method
function registerCallBack($callback){
If(!is_callable($callback)){
         throw new Exception("xxxxxx");
}

$this->callbacks[]=$callback;
}

function sale($product){
Print "{$product->name}:processing n";

foreach($this->callbacks as $callback){
​​ call_user_func($callback,$product);
}
}
}

3. Test
$logger = function($product){
print "logging ({$product->name})";
}

$processor = new ProcessSale();
$processor->registerCallBack($logger);

$processor->sale(new Product("Test"));

Author: sunwei-07