Difference Between An Argument & A Parameter

There’s different opinions on this subject, here’s mine.

My opinion is based on how i understand PHP code and how i write and use it.

Argument or $args

Generally, a argument is the combination of a parameter and a value like this:

posts_per_page => '5'

Where posts_per_page is the parameter or key, 5 is the value and the combination is the argument or 1 of the $args.

Parameter

The parameter in this case is:

posts_per_page