Introduce some features of PHP7

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1.Usage of use

2. The serial number function unserialize has a new filtering function

// 转换对象为 __PHP_Incomplete_Class 对象 $data = unserialize($foo, ["allowed_classes" => false]); // 转换对象为 __PHP_Incomplete_Class 对象，除了 MyClass 和 MyClass2 $data = unserialize($foo, ["allowed_classes" => ["MyClass", "MyClass2"]); // 默认接受所有类 $data = unserialize($foo, ["allowed_classes" => true]);

3. Define a constant array through define

4. Ternary operator null merge

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