php variables for all functions?
<p>I am creating a php page with alot of functions which require to use the same variable (session id). </p>

<p>Am I able to write $ID = $_SESSION['ID'];  and just use 'ID' in each function? </p>

<p>Rather than having to write $ID = $_SESSION['ID'];  in each function?</p>

<p>Thanks</p>
