动态创建PDO查询语句并从用户输入绑定参数

Question

我正在尝试创建一个从post接收用户输入数组的函数，并动态生成查询语句并绑定params。到目前为止，我能够使用引用列表创建查询语句，但是遇到了绑定参数的问题，因为我需要编写一大块switch开关来使其工作。我正在使用CodeIgniter。

/* user input array sample
   array ("title" => "abc",
          "year"  => ["start"=>1999, "end"=>2010]
   )
*/


class Listing extends CI_model {

  private ref_list = [
    'title'    => 'title LIKE :title',
    'year'     => "(year BETWEEN :start AND :end)" 
  ]

  private clause_list = [] // to be generated
  private param_list = [] // to be generated



  function query_create ( array $post_input ) {

    foreach ($post_input as $post_key => $post_value ) {

      // for clause list
      foreach ($this->ref_list as $ref_key => $ref_value ){
        if ($post_key == $ref_key ) {
          $this->clause_list[] = $ref_value;          
        }
      }

      // for param list
      switch($post_key) {
        case "title":
          $value = $post_value;

          $this->param_list[] = [":title", "%{$value}%", PDO::PARAM_STR];
          break;

        case "year":
          $start = $post_value['start'];
          $value = $post_value['end'];

          $this->param_list[] = [":start", "%{$start}%", PDO::PARAM_INT];
          $this->param_list[] = [":end", "%{$end}%", PDO::PARAM_INT];
          break;
      }

    }


    /* loop through clause list array to create query statement */

    $select_string = "SELECT * FROM song ";
    $clause_string = "WHERE ".implode ("AND", $this->clause_list);
    $query_stmt = $select_string . $clause_string


    /* bind param in PDO */

    if (is_array($this->param_list) && !empty($this->param_list)){
        foreach ($this->param_list as $index) {
            $bind   = $index[0];                
            $value  = &$index[1];
            $param  = $index[2];

            $query->bindParam ($bind, $value, $param);
        }
    }


  }

}

正如您所看到的，当发布更多输入时，切换块会变得很大，我有什么方法可以缩短它？