[Php-java-bridge-users] Send Java Variables by Reference to Functions

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I want send a variable that reference a Java object to a function, I tried
it on different ways, but I can not.

$map = new Java('java.util.HashMap');
$map->put('country', 'Columbia');

$this->printMapFromPHP($map);

// Receive the variable by reference
function printMapFromPHP(&$map){
    // try to print, but not print
}

Thanks in advance.