What is the difference between php this, self and parent?

1. this is a pointer to the current object For example: other functions in the same class can be called using this->function name.

2. self is a pointer to the current class Generally, self is used to point to static variables in a class. Please also note that when using self to call static variables, you must use:: (field operator symbol) For example:

self::$firstCount; //Use self to call static variables

3. Parent is a pointer to the parent class Generally use parent to call the constructor of the parent class For example:

parent::__construct( "PBPHome"); //Use parent to call the constructor of the parent class