--TEST--
call_user_func() and friends with named parameters
--FILE--
<?php

$test = function($a = 'a', $b = 'b', $c = 'c') {
    echo "a = $a, b = $b, c = $c\n";
};
$test_variadic = function(...$args) {
    var_dump($args);
};
$test_ref = function(&$ref) {
    $ref++;
};
$test_required = function($a, $b) {
    echo "a = $a, b = $b\n";
};

class Test {
    public function __construct($a = 'a', $b = 'b', $c = 'c') {
        if (func_num_args() != 0) {
            echo "a = $a, b = $b, c = $c\n";
        }
    }

    public function method($a = 'a', $b = 'b', $c = 'c') {
        echo "a = $a, b = $b, c = $c\n";
    }
}

call_user_func($test, 'A', c: 'C');
call_user_func($test, c: 'C', a: 'A');
call_user_func($test, c: 'C');
call_user_func($test_variadic, 'A', c: 'C');
call_user_func($test_ref, ref: null);
var_dump(call_user_func('call_user_func', $test, c: 'D'));
try {
    call_user_func($test_required, b: 'B');
} catch (ArgumentCountError $e) {
    echo $e->getMessage(), "\n";
}
try {
    var_dump(call_user_func('array_slice', [1, 2, 3, 4, 5], length: 2));
} catch (ArgumentCountError $e) {
    echo $e->getMessage(), "\n";
}
try {
    var_dump(call_user_func('array_slice', [1, 2, 3, 4, 'x' => 5], 3, preserve_keys: true));
} catch (ArgumentCountError $e) {
    echo $e->getMessage(), "\n";
}
echo "\n";

$test->__invoke('A', c: 'C');
$test_variadic->__invoke('A', c: 'C');
$test->call(new class {}, 'A', c: 'C');
$test_variadic->call(new class {}, 'A', c: 'C');
echo "\n";

$rf = new ReflectionFunction($test);
$rf->invoke('A', c: 'C');
$rf->invokeArgs(['A', 'c' => 'C']);
$rm = new ReflectionMethod(Test::class, 'method');
$rm->invoke(new Test, 'A', c: 'C');
$rm->invokeArgs(new Test, ['A', 'c' => 'C']);
$rc = new ReflectionClass(Test::class);
$rc->newInstance('A', c: 'C');
$rc->newInstanceArgs(['A', 'c' => 'C']);

?>
--EXPECTF--
a = A, b = b, c = C
a = A, b = b, c = C
a = a, b = b, c = C
array(2) {
  [0]=>
  string(1) "A"
  ["c"]=>
  string(1) "C"
}

Warning: {closure:%s:%d}(): Argument #1 ($ref) must be passed by reference, value given in %s on line %d
a = a, b = b, c = D
NULL
{closure:%s:%d}(): Argument #1 ($a) not passed
array_slice(): Argument #2 ($offset) not passed
array(2) {
  [3]=>
  int(4)
  ["x"]=>
  int(5)
}

a = A, b = b, c = C
array(2) {
  [0]=>
  string(1) "A"
  ["c"]=>
  string(1) "C"
}
a = A, b = b, c = C
array(2) {
  [0]=>
  string(1) "A"
  ["c"]=>
  string(1) "C"
}

a = A, b = b, c = C
a = A, b = b, c = C
a = A, b = b, c = C
a = A, b = b, c = C
a = A, b = b, c = C
a = A, b = b, c = C