PHP中的参数和函数参数有什么不同？ [重复]

This question already has an answer here:

What's the difference between an argument and a parameter? 31 answers

I don't understand difference of arguments and parameter in function.Is there anybody who tell me details about arguments and parameters. What is arguments and what is parameter?

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To be simple -

Variables used in function definition are parameter. Values passed during function call are arguments

function abc($x)
{
//----
//$x is parameter..
}

abc(35); //35 is an argument