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 deserialized 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($data->obj1prop);
echo "<br/>";
print($data2->obj2prop);
?>

The above program execution output result is:

1
2
Continuing Learning
||
<?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($data->obj1prop); echo "<br/>"; print($data2->obj2prop); ?>
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