Function Declared in Included File Not Being Found

Hello, According to the PHP manual on functions (http://www.php.net/manual/en/language.functions.php): "In PHP 3, functions must be defined before they are referenced. No such requirement exists since PHP 4. Except when a function is conditionally defined..." If that is true then why does the following not work as I expect? I expect the result to be "Function was called!" but it actually is "Function test() does not exist!". File: a.php <?php if (function_exists('test')) {

    echo test();

} else {

    echo "Function test() does not exist!";

} require 'b.php'; ?> ------------------------------- File: b.php <?php require 'c.php'; ?> ------------------------------- File: c.php <?php function test() {

    return "Function was called!";

} ?> Chris