call_user_func silent error

gistfile1.aw

<?php
$var1 = 0;
$var2 = 1;

function noreference($var1, $var2) {
    print "noreference\n";
    print $var1 + $var2."\n";
}

function reference(&$var1, &$var2) {
    print "reference\n";
    print $var1 + $var2."\n";
}

call_user_func('noreference', $var1, $var2);

call_user_func('reference', $var1, $var2);

Output under PHP 5.3.4:
1
PHP Warning: Parameter 1 to reference() expected to be a reference, value given in ***/test.php on line 17

Output under PHP 5.3.6:
noreference
1

According to this: http://php.net/manual/en/function.call-user-func.php and "Note that the parameters for call_user_func() are not passed by reference." you have to do this that way:

<?php
$var1 = 0;
$var2 = 1;

function noreference($var1, $var2) {
    print "noreference\n";
    print $var1 + $var2."\n";
}

function reference(&$var1, &$var2) {
    print "reference\n";
    print $var1 + $var2."\n";
}

call_user_func('noreference', $var1, $var2); //OK

call_user_func('reference', $var1, $var2); //wrong

//pass arguments as an array, instead of call_user_func params
call_user_func_array('reference', array(&$var1, &$var2)); //forced reference