Button redirect on url based on user role

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Javascript

PHP

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Hi, i have put this code in a Text widget. Have you got some advice(problem with roles)?
{
function get_user_role();
if($user_role==food)
{?>
<script>
function goack(){
window.location.href="http://localhost/..";}
</script>
else{?>
<script>
function goack(){
window.location.href="http://localhost/...";}
</script>
?>
}

and in button i insert this
goack();
it goes only on else not on if. Thank you in advance