function; how to create?

I haven’t quite got the hang of functions yet,
I’ve gotten too spoiled of using include() and
placing what I need in a different file.

I’m at a place now where I need everything on one page,
so I need to do a function().

What I’ve tried, I can’t get it to work…

Here is a sample code:

[code=php]

// if count stronger = 0 retrieve the first two items in weaker
if($count_stronger == 0)
{
$weakerpairs = $weaker[0].$weaker[1];
$whichpair = $weakerpairs;
// /////////////////////////////////
// /////////////////////////////////
include(“testpair.php”);
// ////////////////////////////////
// ////////////////////////////////

}

[/code]

a portion of testpair.php is:

[code=php]

<?php
switch($whichpair){
case “EURUSD” : $testpair = “eurusd”; break;
case “USDEUR” : $testpair = “eurusd”; break;
case “EURGBP” : $testpair = “eurgbp”; break;

…
…
}
?>

[/code]

I made a few attempts to turn ” testpair.php ” into a function
at the beginning of the code:

[code=php]
<?php
function (testpair){
switch($whichpair){
case “EURUSD” : $testpair = “eurusd”; break;
case “USDEUR” : $testpair = “eurusd”; break;
case “EURGBP” : $testpair = “eurgbp”; break;

…
…
}
}
?>

…code…
…code…

// if count stronger = 0 retrieve the first two items in weaker
if($count_stronger == 0)
{
$weakerpairs = $weaker[0].$weaker[1];
$whichpair = $weakerpairs;
// /////////////////////////////////
// /////////////////////////////////
testpair();
// ////////////////////////////////
// ////////////////////////////////

}
[/code]

I’ve tried to navigate through php.net and I can’t seem to find a simple answer.
I have the Sams Teach yourself php and it doesn’t have a simple answer.
Classes, Objects la la la. Gee, all I want is a simple function().

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