Description:
------------
The following functions are variadic but ReflectionFunction::isVariadic and ReflectionParameter::isVariadic return false :
array_diff_uassoc
array_diff_ukey
array_intersect_uassoc
array_intersect_ukey
array_udiff
array_udiff_assoc
array_udiff_uassoc
array_uintersect
array_uintersect_assoc
array_uintersect_uassoc

The test script looks more complicated than necessary because I wanted to highlight the differencies with HHVM (see : https://3v4l.org/clKBH ).

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

$functions = [
    'array_diff_uassoc',
    'array_diff_ukey',
    'array_intersect_uassoc',
    'array_intersect_ukey',
    'array_udiff',
    'array_udiff_assoc',
    'array_udiff_uassoc',
    'array_uintersect',
    'array_uintersect_assoc',
    'array_uintersect_uassoc',
];

foreach ($functions as $func) {
    $reflFunc = new ReflectionFunction($func);
    $nbParams = $reflFunc->getNumberOfParameters();
    $nbRequiredParams = $reflFunc->getNumberOfRequiredParameters();
    printf("$func ($nbParams params, $nbRequiredParams required) %s VARIADIC", $reflFunc->isVariadic() ? "IS" : "IS NOT");
    foreach ($reflFunc->getParameters() as $i => $param) {
        if ($param->isVariadic()) {
            printf(" - PARAM #%d%s IS VARIADIC", $i + 1, $param->isOptional() ? " (Opt.)" : "");
        }
    }
    echo PHP_EOL;
}

Expected result:
----------------
array_diff_uassoc (3 params, 3 required) IS VARIADIC - PARAM #2 IS VARIADIC
array_diff_ukey (3 params, 3 required) IS VARIADIC - PARAM #2 IS VARIADIC
array_intersect_uassoc (3 params, 3 required) IS VARIADIC - PARAM #2 IS VARIADIC
array_intersect_ukey (3 params, 3 required) IS VARIADIC - PARAM #2 IS VARIADIC
array_udiff (3 params, 3 required) IS VARIADIC - PARAM #2 IS VARIADIC
array_udiff_assoc (3 params, 3 required) IS VARIADIC - PARAM #2 IS VARIADIC
array_udiff_uassoc (4 params, 4 required) IS VARIADIC - PARAM #2 IS VARIADIC
array_uintersect (3 params, 3 required) IS VARIADIC - PARAM #2 IS VARIADIC
array_uintersect_assoc (3 params, 3 required) IS VARIADIC - PARAM #2 IS VARIADIC
array_uintersect_uassoc (4 params, 4 required) IS VARIADIC - PARAM #2 IS VARIADIC

Actual result:
--------------
array_diff_uassoc (3 params, 3 required) IS NOT VARIADIC
array_diff_ukey (3 params, 3 required) IS NOT VARIADIC
array_intersect_uassoc (3 params, 3 required) IS NOT VARIADIC
array_intersect_ukey (3 params, 3 required) IS NOT VARIADIC
array_udiff (3 params, 3 required) IS NOT VARIADIC
array_udiff_assoc (3 params, 3 required) IS NOT VARIADIC
array_udiff_uassoc (4 params, 4 required) IS NOT VARIADIC
array_uintersect (3 params, 3 required) IS NOT VARIADIC
array_uintersect_assoc (3 params, 3 required) IS NOT VARIADIC
array_uintersect_uassoc (4 params, 4 required) IS NOT VARIADIC