Not sure if I phrased the question correctly but let me explain. In a procedural program, for example:
function getUserId()
{
// some stuff
return $someUserId;
}
function getUsername()
{
$id = getUserId();
$query = mysql_query(" SELECT * FROM users WHERE id = '$id' ");
while ($row = mysql_fetch_assoc($query))
{
return $row['username'];
}
}
In the above, the getUsername function called the getUserId function. Since that function was called it must be above the one that called it, otherwise it won't work.
What I would like to know is, in object oriented programming, does the order of functions (methods) in a class matter? Can I call a method within another method even if the method being called is defined further down in the script?