PHPCfg\Visitor\Simplifier::tryRemoveTrivialPhi PHP Method

    private function tryRemoveTrivialPhi(Op\Phi $phi, Block $block)
    {
        if (count($phi->vars) > 1) {
            return false;
        }
        if (count($phi->vars) === 0) {
            // shouldn't happen except in unused variables
            $var = new Operand\Temporary($phi->result->original);
        } else {
            $var = $phi->vars[0];
        }
        // Remove Phi!
        $this->replaceVariables($phi->result, $var, $block);
        return true;
    }