Run this code. Example of how parameters work.

gistfile1.php

<?php
function test( $test ) {
  echo $test;
}


$dang = 'dang';

test( $dang );
test( '123' );

// this program will output: "dang123"

// When you call test with a parameter, you can pass any value or any variable in for the parameter and the function will insert the value of that parameter into $test
?>