PHP7引入了過濾?unserialize()函數以在反序列化不受信任的數據對象時提供更好的安全性。它可以防止可能的代碼注入，使開發人員能夠使用序列化白名單類。

示例

class MyClass1 {

public $obj1prop;

}

class MyClass2 {

public $obj2prop;

}

$obj1 = new MyClass1();

$obj1->obj1prop = 1;

$obj2 = new MyClass2();

$obj2->obj2prop = 2;

$serializedObj1 = serialize($obj1);

$serializedObj2 = serialize($obj2);

// default behaviour that accepts all classes

// second argument can be ommited.

// if allowed_classes is passed as false, unserialize converts all objects into __PHP_Incomplete_Class object

$data = unserialize($serializedObj1 , ["allowed_classes" => true]);

// converts all objects into __PHP_Incomplete_Class object except those of MyClass1 and MyClass2

$data2 = unserialize($serializedObj2 , ["allowed_classes" => ["MyClass1", "MyClass2"]]);

print($data->obj1prop);

print("
");

print($data2->obj2prop);

?>

這將在瀏覽器產生以下輸出?-

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