php - 如何在方法中传递数组中的变量？

Question

我有很长的多个 SQL 查询，需要针对不同的 ID 多次使用。我认为最好将这些查询放在方法内的数组中，以便我可以随时调用它。

问题是，我在尝试将 ID 变量放入查询时卡住了。打个比方，代码是这样的：

class SqlQueries {

  protected $_queries;

  private function $_queriesArr() {
    $_queries = array(
                  "SELECT * FROM tbl_a WHERE id = $id_a",
                  "UPDATE tbl_b SET b = NULL WHERE id = $id_b",
                  "UPDATE tbl_c SET c = NULL WHERE id = $id_c",
                );
    return $_queries;
  }

  public function $callQuery() {
    $id_a = 2;
    $tbl_a = $this->$_queriesArr();
    return $tbl_a[0];
  }

  public function $mainMethod() {
    echo $this->callQuery();
  }

}

我总是对查询中的变量出错。

Answer 1

添加一些像这样的参数怎么样，但是为什么你命名你的函数以 $ 开头？顺便说一句，只需将参数添加到您的函数中，并希望它可以按照您的喜好工作

private function queriesArr($id_a, $id_b, $id_c) {
    $_queries = array(
                  "SELECT * FROM tbl_a WHERE id = $id_a",
                  "UPDATE tbl_b SET b = NULL WHERE id = $id_b",
                  "UPDATE tbl_c SET c = NULL WHERE id = $id_c",
                );
    return $_queries;
  }

Answer 2

class SqlQueries {

protected $_queries;

private function $_queriesArr($id_a='', $id_b='', $id_c='') {
$_queries = array(
              "SELECT * FROM tbl_a WHERE id = '".$id_a."' ",
              "UPDATE tbl_b SET b = NULL WHERE id = '".$id_b."' ",
              "UPDATE tbl_c SET c = NULL WHERE id = '".$id_c."' ",
            );
return $_queries;
}

public function $callQuery() {
   $id_a = 2;
   $tbl_a = $this->$_queriesArr($id_a);
   return $tbl_a[0];
}

public function $mainMethod() {
   echo $this->callQuery();
}

}