使用相同的名称将变量传递给函数

Question

Is it considered wrong to pass a variable to a function where the variable passed has the same name as the variable in the function itself? I never see anyone do this, but wondered if there was a reason why (other than readability). Example:

$variable = "value";

function myFunction($variable) {
    return $variable;
}

Answer 1

No there is not problem with doing this except some naming confusion. Because,

$variable = "value"; // this declaration belong to a global scope

// but $variable passing through as argument, makes it scope within that function declaration only
function myFunction($variable) {
    return $variable;
}

You might have expect that if you call the function like myFunction() i.e. without any parameter, it will return you "value", but absolutely not, cause $variable passed as argument is not the global one.

But if you try to use the global $variable within the myFunction, then it will cause some conflict, that is why no one do this.