Description:
------------
ReflectionFunction incorrectly states that $sort_order and $array1_sort_flags are passed by reference, not by value.

This doesn't make sense, and is inconsistent with the documentation at https://secure.php.net/array_multisort

See https://3v4l.org/sZcuu

Test script:
---------------
<?php

$functionName = 'array_multisort';
printf("Params of %s:\n", $functionName);
foreach ((new ReflectionFunction($functionName))->getParameters() as $param) {
    printf("Param \$%s: isPassedByReference=%s, isOptional=%s, isVariadic=%s\n",
        $param->getName(),
        var_export($param->isPassedByReference(), true),
        var_export($param->isOptional(), true),
        var_export($param->isVariadic(), true));
}


Expected result:
----------------
... otherwise unchanged
Param $sort_order: isPassedByReference=false, isOptional=true, isVariadic=false
Param $sort_flags: isPassedByReference=false, isOptional=true, isVariadic=false
... otherwise unchanged

Actual result:
--------------
Params of array_multisort:
Param $arr1: isPassedByReference=true, isOptional=false, isVariadic=false
Param $sort_order: isPassedByReference=true, isOptional=true, isVariadic=false
Param $sort_flags: isPassedByReference=true, isOptional=true, isVariadic=false
Param $arr2: isPassedByReference=true, isOptional=true, isVariadic=true