I have downloaded a benchmark script.
Invalid characters passed for conversion.
It is in this line:
call_user_func_array($function, array($i));
The script:
$mathFunctions = array("abs", "acos", "asin", "atan", "bindec", "floor", "exp", "sin", "tan", "pi", "is_finite", "is_nan", "sqrt");
for ($i = 0; $i < $count; $i++) {
foreach ($mathFunctions as $function) {
call_user_func_array($function, array($i));
}
}