What do you call an object called a caller?

When you read PHP manual, you see a section of the attributes inside the class and object , which says:

When a method is called inside a class definition, there is an available pseudo-variable $this. $this is a reference to the calling object (usually the object that the method is dependent on, but it may be another object if it is called from a second object statically).

Search on the Internet, for the $this, or relatively understanding, but for the main call object, still do not understand. Can you explain it in a simple and easy-to-understand description?

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When you read PHP manual, you see a section of the attributes inside the class and object , which says:

When a method is called inside a class definition, there is an available pseudo-variable $this. $this is a reference to the calling object (usually the object that the method is dependent on, but it may be another object if it is called from a second object statically).

Search on the Internet, for the $this, or relatively understanding, but for the main call object, still do not understand. Can you explain it in a simple and easy-to-understand description?

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