<?php

$a = 1;
$b =& $a; 
$b = 2; 
$c = $b;
$c = 7; 
unset($a); 


function &pass_out() {
    global $filestr;  

    $filestr = get_file_contents();
    return $_GLOBALS['filestr'];
}
function pass_in(&$in_filestr) {
    echo . strlen($in_filestr);

    
    $in_filestr .= ;
    echo . strlen($in_filestr);
}

$tmp = &pass_out(); 
pass_in($tmp); 

?>