PHPCfg\Parser::readVariable PHP Method

    private function readVariable(Operand $var)
    {
        if ($var instanceof Operand\BoundVariable) {
            // bound variables are immune to SSA
            return $var;
        }
        if ($var instanceof Operand\Variable) {
            if ($var->name instanceof Literal) {
                return $this->readVariableName($this->getVariableName($var), $this->block);
            } else {
                $this->readVariable($var->name);
                // variable variable read - all we can do is register the nested read
                return $var;
            }
        }
        if ($var instanceof Operand\Temporary && $var->original instanceof Operand) {
            return $this->readVariable($var->original);
        }
        return $var;
    }