<?php

    $junctions = 'paul';
    switch ($junctions) {

        case join(", ", array('george','paul')):
            $id     = 1;
            break;
        case array('paul','max'):
            $id     = 2;
            break;
        case array('eric'):
            $id     = 3;
            break;

        //default
        default:
            $id     = 3;
            break;

    }

var_dump($id);
var_dump(join(", ", array('george','paul')));


?>

int(3)
string(12) "george, paul"