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What is a difference between a method and a function?

The words are not opposed to each other but rather describes two possible aspects of a subroutine. An attempt to define the words follows:

Subroutine: A set of instructions that can be used several times in the same program.

Function: A subroutine that returns a value. Derived from functions in mathematics.

Method: A subroutine that belongs to an object or a class. Could be a function.


Method is actually a function used in the context of a class/object.

When you create a function outside of a class/object, you can call it a function but when you create a function inside a class, you can call it a method.
class foo{
   public function bar(){ // a method
     ........
   }
}




function bar(){  // a function not part of an object
}




So an object can have methods (functions) and properties (variables).


Source : Stackoverflow
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