No warnings displayed if i reference arguments at call time for a function

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Hello,

 

I was trying out some code to check out how some of the php settings work and when i tried allow_call_time_pass_reference to see if it works, it doesn't spew out any warning or error like the comments in the .ini file mention (or in the manual sites). Maybe i'm not using some other setting in order to see this? Here is my EXACT code.

 

<?php
ini_set('display_errors',1);
error_reporting(-1);


$variable = 'String';

function display($variable) {
return $variable;
}

echo display(&$variable);
?>

 

Outputs : String. No errors, no warnings.

I'm running PHP Version 5.3.2-1ubuntu4.5