Php object-oriented-PHP development

_ ToString () is a convenient way to quickly obtain the string information of an object. It seems that magic methods have an "automatic" feature, such as automatic acquisition and automatic printing, __tostring () this method is automatically called when the object reference is directly output. When debugging a program, we need to know whether the data is correct. For example, when printing an object, you can check what attributes and values the object has. If the class defines the toString method, echo can print the object body during the test, the object will automatically call the class definition t deja vu, the magic method of object-oriented programming in php