<?php
$js = new MongoDB\BSON\Javascript('function foo(bar) { return bar; }');
var_dump($js->getScope());
$js = new MongoDB\BSON\Javascript('function foo() { return foo; }', ['foo' => 42]);
var_dump($js->getScope());
?>
The above example will output:
NULL
object(stdClass)#1 (1) {
["foo"]=>
int(42)
}