Returning value by reference not working

[zeugentor]

I cannot get value by reference in php-5.6. The same issue is in php-cpp-2.0.0 release for php-7.0.

C++ code:
Php::Value Setting::lookupValueFloat(Php::Parameters& params) const {
double value = 0;
bool res = _setting.lookupValue((const char*)params[0], value); -- c++ internal object
params[1] = value;
return res;
}

Php code:
$val = false;
$flag = $cfg->lookupValueFloat("humidy", $val);
echo("flag = ".$flag." humidy val = ".$val."\n");

$ php --version
PHP 5.6.31-1~ubuntu16.04.1+deb.sury.org+1 (cli)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies

$ lsb_release -a
No LSB modules are available.
Distributor ID: LinuxMint
Description: Linux Mint 18.2 Sonya
Release: 18.2
Codename: sonya

[guohai]

Run into this issue too

PHP 5.6.36-1+ubuntu14.04.1+deb.sury.org+1 (cli)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies