php-8.0.30-src/Zend/tests/closure_030.phpt

--TEST--
Closure 030: Using lambda with variable variables
--FILE--
<?php

$b = function() { return func_get_args(); };
$a = 'b';
var_dump($$a(1));
var_dump($$a->__invoke(2));

?>
--EXPECT--
array(1) {
  [0]=>
  int(1)
}
array(1) {
  [0]=>
  int(2)
}