Oops, returning the wrong thing. Corrected below...
function call_function($function_name, &$vars)
{
$code = '$retval = '.$function.'(';
$params = array();
foreach (array_keys($vars) as $key)
$params[] = '$var['.$key.']';
$code .= implode(',', $params);
$code .= ');';
eval($code);
return $retval;
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