在開發(fā)系統(tǒng)的過程中，有時(shí)候希望針對(duì)一個(gè)對(duì)象或者一個(gè)值執(zhí)行多個(gè)不相干的操作，那么此時(shí)運(yùn)用回調(diào)將是最好的方式，回調(diào)函數(shù)可以是匿名函數(shù)、非匿名函數(shù)以及靜態(tài)方法。

class Person{

public $name;

public $age;

function __construct($name, $age){

$this->name = $name;

$this->age = $age;

}

}

class ProcessHire{

private $callbacks;

// 注冊(cè)回調(diào)方法

function registerCallback($callback){

if (!is_callable($callback)){

throw new Exception("callback not callable");

}

$this->callbacks[] = $callback;

}

// 逐一執(zhí)行回調(diào)方法，并發(fā)參數(shù)傳入回調(diào)方法

function hire($person){

print "Hiring {$person->name}:
";

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

call_user_func($callback, $person);

}

}

}

// 匿名函數(shù)作為回調(diào)函數(shù)

$fun=create_function('$person','print "importting ({$person->name})";');

$processor = new ProcessHire();

$processor->registerCallback($fun);

$processor->hire(new Person("LiFang", 20));

print "
";

$processor->hire(new Person("LiuMing", 23));執(zhí)行結(jié)果：

Hiring LiFang:

importting (LiFang)

Hiring LiuMIng:

importting (LiuMing)

// 非匿名函數(shù)作為回調(diào)函數(shù)

class Sign{

function signContract($person){

print "sign a contract with {$person->name}
";

}

}

$processor = new ProcessHire();

// 這里傳入的是數(shù)組，而且第一個(gè)是對(duì)象實(shí)例，第二個(gè)是函數(shù)名稱

$processor->registerCallback(array(new Sign(), "signContract"));

//$processor->registerCallback(array("Sign", "signContract")); 也可以這么寫，包括靜態(tài)方法

$processor->hire(new Person("LiFang", 20));

print "
";

$processor->hire(new Person("LiuMing", 23));執(zhí)行結(jié)果：

Hiring LiFang:

sign a contract with LiFang

Hiring LiuMIng:

sign a contract with LiuMing

// 靜態(tài)方法作為回調(diào)函數(shù)

class Check{

static function checkAge($maxAge){

$age = 0;

return function($person) use($maxAge, $age){

$age = $person->age;

print "check: $age
";

if ($age>$maxAge){

print "age is too hight: $age";

}

};

}

}

$processor = new ProcessHire();

$processor->registerCallback(Check::checkAge(40));

$processor->hire(new Person("LiFang", 20));

print "
";

$processor->hire(new Person("LiuMing", 43));執(zhí)行結(jié)果： ?Hiring LiFang: ???? check: 20 ?Hiring LiuMIng: ???? check: 43 ???? age is too hight: 43 當(dāng)讓，你可以根據(jù)需要同時(shí)注冊(cè)多個(gè)不相干的方法，這樣，系統(tǒng)就會(huì)調(diào)用多個(gè)方法來(lái)處理你傳入的對(duì)象了。

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