PHP filter unserialize()

PHP 7 adds a feature that can provide filtering for unserialize(), which can prevent code injection of illegal data and provide safer deserialization Data

Example

<?php
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);
// 默认行为是接收所有类
// 第二个参数可以忽略
// 如果 allowed_classes 设置为 false, unserialize 会将所有对象转换为 __PHP_Incomplete_Class 对象
$data = unserialize($serializedObj1 , ["allowed_classes" => true]);
// 转换所有对象到 __PHP_Incomplete_Class 对象，除了 MyClass1 和 MyClass2
$data2 = unserialize($serializedObj2 , ["allowed_classes" => ["MyClass1", "MyClass2"]]);
print($data->obj1prop);
print(PHP_EOL);
print($data2->obj2prop);
?>

The execution output of the above program is:

1
2