php - 在PHP中清空$ array []的旧值

我正在尝试删除我在互联网上搜索的数组的旧值，我刚刚发现使用此solution的方法unset（），但我的情况似乎有些不同，这是我的完整代码

<?php



header('Content-type: application/json; charset=utf-8');
$link = mysqli_connect("localhost","root","");
mysqli_query($link,"SET NAMES UTF8");
$db= mysqli_select_db($link,"Mirsa") or die("Cannot select Database.");



 if (isset($_GET['Product_ID']) ){
   $productId;
    $Menu_ID =$_GET['Product_ID'];



$query = "SELECT
   mirsaProductId,mirsaProductCode,mirsaProductDescription,
   mirsaProductPcsInCartoon,mirsaProductWeight,mirsaProductVolume,
    mirsaProductCodeBType,mirsaProductCodeCType,FK_mirsaCategoryId
   from mirsaProduct WHERE FK_mirsaCategoryId='$Menu_ID'";



    $result = mysqli_query($link,$query) or die(mysql_error($link));

                $response["Products"] = array();
                $products = array();
         while ($row = mysqli_fetch_array($result)) {
                $image[]=array()
                $products["mirsaProductId"] =          $row["mirsaProductId"];
                $products["mirsaProductCode"]         = $row["mirsaProductCode"];
                $products["mirsaProductDescription"]  = $row["mirsaProductDescription"];
                $products["mirsaProductPcsInCartoon"] = $row["mirsaProductPcsInCartoon"];
                $products["mirsaProductWeight"] =      $row["mirsaProductWeight"];
                $products["mirsaProductVolume"] =       $row["mirsaProductVolume"];
                $products["mirsaProductCodeBType"] =   $row["mirsaProductCodeBType"];
                $products["mirsaProductCodeCType"] =   $row["mirsaProductCodeCType"];
                $productId = $row["mirsaProductId"];




$query2 = "SELECT mirsaProductUrlImage FROM mirsaProduct,mirsaProductImages
WHERE FK_mirsaProductId = '$productId' GROUP BY mirsaProductUrlImage";

    $result2=mysqli_query($link, $query2);
    while ($row2 = mysqli_fetch_array($result2))
      {
             $image [] = $row2["mirsaProductUrlImage"];
             $products["mirsaProductUrlImage"]=$image;
      }
     array_push($response["Products"], $products);





        }
                  die(json_encode($response));


  }

// echoing JSON response

 else {
// no products found
$response["success"] = 0;
$response["message"] = "No Products";
   die(json_encode($response));
 }
    ?>

我正在以这种方式回应

  {
 ProductId: "1",
 ProductCode: "118.023",
 ProductDescription: "NEM OVAL (Transparent)",
 ProductPcsInCartoon: "10",
 ProductWeight: "7.55 - 8.05(KG)",
 ProductVolume: "0.104(m3)",
 ProductCodeBType: "NA",
 ProductCodeCType: "NA",
 ProductUrlImage: [
  "1.png",
  "2.png"
 ]
 },


{
    ProductId: "2",
    ProductCode: "118.024",
    ProductDescription: "NEM OVAL (Opac)",
    ProductPcsInCartoon: "10",
    ProductWeight: "7.55 - 8.05(KG)",
    ProductVolume: "7.55 - 8.05(KG)",
    ProductCodeBType: "NA",
    ProductCodeCType: "NA",
    ProductUrlImage: [
            "1.png",
            "2.png"
          ]

第二个JSON对象不包含这2个图像的url，它使用$ image []的旧值，因此我需要以需要您的帮助的方式重新初始化或清空他的值，您一直是我们的支持

最佳答案

我要去刺。由于您从未真正将$image初始化为数组。您实际上打算：

$image[] = array()

成为：

$image = array();

这将导致$image数组每次通过第一个while循环重置。

关于php - 在PHP中清空$ array []的旧值，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/43641332/