SQL语句不能与图像上传一起工作 - sql statement is not working with image upload

所以我正在做一个图像上传表单和图像上传只是很好，但图像加载后的sql语句不工作。我想知道如何解决这个问题，这也是我第一次尝试准备好的语句，所以我想知道我的语法是否正确或什么。

<?php
// Check for errors
if($_FILES['file_upload']['error'] > 0){
    die('An error ocurred when uploading.');
}
if(!getimagesize($_FILES['file_upload']['tmp_name'])){
    die('Please ensure you are uploading an image.');
}
// Check filetype
if($_FILES['file_upload']['type'] != 'image/png'){
    die('Unsupported filetype uploaded.');
}
// Check filesize
if($_FILES['file_upload']['size'] > 500000){
    die('File uploaded exceeds maximum upload size.');
}
//Rename File
$temp = explode(".", $_FILES["file"]["name"]);
$filename = round(microtime(true)) . '.' . "png";
// Upload file
if(!move_uploaded_file($_FILES['file_upload']['tmp_name'], '../images/' . $filename)){
    die('Error uploading file - check destination is writeable.');
}
// die('File uploaded successfully.');
session_start();
require_once('connection.php');
$sql = $conn->prepare("INSERT INTO items (poster, item_name, item_desc, item_type, item_price, link) VALUES (?, ?, ?, ?, ?, ?)");
$sql->bind_param($poster, $item_name, $item_desc, $item_type, $item_price, $link);
$item_type = $_POST['item_type'];
$item_name = $_POST['item_name'];
$item_desc = $_POST['item_desc'];
$item_price = $_POST['item_price'];
$poster = $_SESSION['username'];
$link = $filename;
$poster = filter_var($item_type, FILTER_SANITIZE_STRING);
$item_name = filter_var($item_type, FILTER_SANITIZE_STRING);
$item_desc = filter_var($item_type, FILTER_SANITIZE_STRING);
$item_type = filter_var($item_type, FILTER_SANITIZE_STRING);
$item_price = filter_var($item_type, FILTER_SANITIZE_STRING);
$link = filter_var($item_type, FILTER_SANITIZE_STRING);
$sql->execute();
?>

您没有在bind_param中定义数据类型。如下所示:

$sql->bind_param('ssssds',$poster, $item_name, $item_desc, $item_type, $item_price, $link);

请注意始终在所有代码的第一行开始php会话

<?php
session_start();

并将第一项中的值类型设置为

$sql->bind_param("ssssss", $poster, $item_name, $item_desc, $item_type, $item_price, $link);

不要忘记close语句:)

首先，为了安全起见，您需要移动脚本顶部的这一行。

<?php
session_start();

因为你在bind_param中使用的变量还不存在，你必须在bind_param

之前创建变量

如果变量存在，那么按照您最初拥有bind_param和数据分配的顺序将新值设置到现有变量中就可以了。

您还可以稍微减少代码并过滤post变量，而不是遍历一组新的标量变量。您还将$item_type过滤到所有变量中。哈哈，复制粘贴每次都会让你失望的。

$sql = $conn->prepare("INSERT INTO items (poster, item_name, item_desc, item_type, item_price, link) VALUES (?, ?, ?, ?, ?, ?)");

$poster     = filter_var($_SESSION['username'], FILTER_SANITIZE_STRING);
$item_name  = filter_var($_POST['item_name'],   FILTER_SANITIZE_STRING);
$item_desc  = filter_var($_POST['item_desc'],   FILTER_SANITIZE_STRING);
$item_type  = filter_var($_POST['item_type'],   FILTER_SANITIZE_STRING);
$item_price = filter_var($_POST['item_price'],  FILTER_SANITIZE_NUMBER_FLOAT);
$link       = filter_var($filename,             FILTER_SANITIZE_STRING);
$sql->bind_param('ssssds',$poster, $item_name, $item_desc, $item_type, $item_price, $link);