PHP Object-oriented

I. Programming ideas 1. Process oriented

Summed up is "from top to bottom, gradually refine", a complex problem decomposition into a simple problem to make a step-by-step

2. Object-oriented

The so-called object-oriented is to simulate the real world as much as possible when programming!

Step one: Analyze which actions are emitted by which entities the second step: Define these entities and add the corresponding properties and functions to them. Step three: Let the entity perform the corresponding function or action 3. Process-oriented versus object-oriented comparisons

1, can be implemented code reuse and modular programming, object-oriented modularity deeper, not only simple to encapsulate the function (encapsulated into a function), but also to call the function of the body to encapsulate, to achieve a body has a function, in the process of use, first get the corresponding subject, and then the main body to achieve the relevant functions

2, object-oriented data is more closed and more secure

3, the object-oriented way of thinking closer to real life, easier to solve large and complex business logic

4, from the perspective of early development, object-oriented is more complex than process-oriented, but from the perspective of maintenance and expansion, object-oriented is much more simple than the process of orientation

4. $this Keywords

Represents the current object, who calls it on behalf of WHO

Second, the Magic method

__cosntruct construction method for automatic invocation when creating an object

__destruct a destructor that is called automatically when an object is deleted, such as when an object is deleted, the invoked resource can be freed

__clone is automatically called when cloning an object, you can write some code to distinguish the cloned object

__sleep is called automatically when serializing an object, typically returning an array of properties that need to be serialized

__wakeup called when deserializing an object, it is generally necessary to write the initialization code in it (typically a resource type that cannot be serialized)

__get ($name) when the value of an inaccessible property is obtained

__set ($name, $value) when assigning a value to a property that is not accessible

__unset ($name) when an inaccessible property is deleted

__isset ($name) to determine if an inaccessible property exists

__call ($name, $arr) $name is the method name, $arr is the argument list, when calling an inaccessible non-static method (object method), the Magic method is automatically executed, where the inaccessible is divided into non-existent or no access to the two cases

__callstatic ($name, $arr) $name is the method name, $arr is the parameter list, when calling an inaccessible static method (object method), the Magic method is automatically executed, where the inaccessible is divided into non-existent or no access to the two cases

__autoload is not a magic method, can be called magic Function! General Registration The Auto-load method uses Spl_autoload_register ($name) $name as the method name. Register non-static methods in the object using Spl_autoload_register (Array ($obj, $name)), $obj as the object name, $name as the method name

Register the static method in the object using Spl_autoload_register (Array ($class, $name)), $class the class name, $name the method name, and a simple method Spl_autoload_register (" Class Name:: Static method Name ");

__invoke () The Magic method is automatically executed when the object is called as a function or method! Parameters can be passed inside parentheses

__tostring () uses an object as a string to automatically trigger the method!

Three, magic constant

__dir__ returns the current root directory path

__FILE__ returns the current file path

__LINE__ returns the current number of rows

__FUNCTION__: Returns the name of the current function

__class__ return represents the current class name

__method__ returns the current method name!

__NAMESPACE__: Represents the current namespace name!

PHP Object-oriented