如何从类内部的数组中获取值

Question

我有一个将数组值传递给 create_parts.php 的表单，然后我试图将这些值传递给部件类以插入到数据库中。此时我只是迷路了......表单传递给create_parts.php，我可以回显数组的结果。但是在我的课堂上我无法获得任何值，因此我插入到数据库中的只是一堆NULL。

<?php
include_once '../config/database.php';
include_once '../objects/parts_object.php';

$database = new Database();
$db = $database->getConnection();

$parts= new parts($db);

    $parts->est_part_idArr=$_POST['est_part_id'];
    $parts->part_qtyArr=$_POST['part_qty'];
    $parts->part_numArr=$_POST['part_num'];
    $parts->part_discArr=$_POST['part_disc'];
    $parts->part_costArr=$_POST['part_cost'];

$parts->create();

我可以在这里回显结果并得到

{"est_part_idArr":["123","124"],"part_qtyArr":["4","6"],"part_numArr":
["2334","3344"],"part_discArr":["part","parts"],"part_costArr":["56","33"]

并回显 $stmt

{"queryString":"INSERT INTO \r\n partsT\r\n SET \r\n est_part_id=:est_part_id, part_qty=:part_qty, part_num=:part_num, part_disc=:part_disc, part_cost=:part_cost"}

但是在 part_object.php 中我什么也做不了。我可以将它插入数据库，但都是NULL。

class parts{

private $conn;
private $table_name = "partsT";

public $est_part_idArr;
public $part_qtyArr;
public $part_numArr;
public $part_discArr;
public $part_costArr;

public function __construct($db){
$this->conn = $db; }

function create(){

  $query = "INSERT INTO 
                " . $this->table_name . "
            SET 
               est_part_id=:est_part_id, part_qty=:part_qty, part_num=:part_num, part_disc=:part_disc, part_cost=:part_cost";

    $stmt = $this->conn->prepare($query);

if(!empty($this->$est_part_idArr)){
    for ($i = 0; $i < count($this->$est_part_idArr); $i++) {
        if(!empty($this->$est_part_idArr[$i])){
            $est_part_id = $this->$est_part_idArr[$i];
            $part_qty = $this->$part_qtyArr[$i];
            $part_num = $this->$part_numArr[$i];
            $part_disc = $this->$part_discArr[$i];
            $part_cost = $this->$part_costArr[$i];
        $stmt->execute(array(
        ':est_part_id'  => $est_part_id,
        ':part_qty'     => $part_qty,
        ':part_num'     => $part_num,
        ':part_disc'    => $part_disc,
        ':part_cost'    => $part_cost));

        }
    }
 }

    $this->est_part_idArr=htmlspecialchars(strip_tags($this->est_part_idArr));
    $this->part_qtyArr=htmlspecialchars(strip_tags($this->part_qtyArr));
    $this->part_numArr=htmlspecialchars(strip_tags($this->part_numArr));
    $this->part_discArr=htmlspecialchars(strip_tags($this->part_discArr));
    $this->part_costArr=htmlspecialchars(strip_tags($this->part_costArr));


    $stmt->bindParam(":est_part_id", $this->est_part_idArr[0]);
    $stmt->bindParam(":part_qty", $this->part_qtyArr[0]);
    $stmt->bindParam(":part_num", $this->part_numArr[0]);
    $stmt->bindParam(":part_disc", $this->part_discArr[0]);
    $stmt->bindParam(":part_cost", $this->part_costArr[0]);

if($stmt->execute()){
        return true;

    }else{
        return false;
    }
        }

现在我知道了

public $est_part_idArr;
public $part_qtyArr;
public $part_numArr;
public $part_discArr;
public $part_costArr;

错了，我什么都做不了。

Answer 1

您在变量前面缺少一些 $this 来访问您的公共类成员。让我们以这一行为例：

$est_part_id = $est_part_idArr[$i];

在我看来应该是这样的：

$est_part_id = $this->est_part_idArr[$i];

另一方面，当您绑定参数时，您正在使用如下代码：

$stmt->bindParam(":est_part_id", $this->est_part_id);

我认为应该是这样的

$stmt->bindParam(":est_part_id", $this->est_part_idArr);

或

$stmt->bindParam(":est_part_id", $this->est_part_idArr[0]);