如何避免重复的代码？

Question

我遇到以下问题，我的SQLBuilder的那些方法是一样的，我该怎么做才能减少代码？

    public function select($fields){
        if(is_array($fields)){
            $this->fields = implode(',', $fields);
        } else {
            $this->fields = $fields;
        } 
        return $this;
    }

    public function from($tables){
        if(is_array($tables)){
            $this->tables = implode(',', $tables);
        } else {
            $this->tables = $tables;
        } 
        return $this;
    }

Answer 1

创建一个公共私有方法来执行处理，然后创建使用它们的公共方法

public function select($fields){
    return $this->builddata($fields, 'fields');
}

public function from($tables){
    return $this->builddata($tables, 'tables');
}

private function builddata($data, $storage) {
    if(is_array($data)){
        $data = implode(',', $data);
    }
    $this->$storage = $data; // variable variable

    return $this;
}

Answer 2

或

public function action($data, $type){
        if(is_array($data)){
            $this->$type = implode(',', $data);
        } else {
            $this->$type = $data;
        } 
        return $this;
    }

然后

$this->action($data, 'select');