问题描述
我知道很多人偶尔会遇到同样的错误，但是我已经查看了所有以前的答案和我的代码，并且我尝试了带有和不带有反引号的 col这是我当前的代码我也尝试过 $var 以及 $var 但相同的
I know a lot of people have the same error occasionally however I have looked at all previous answers and my code and i have tried col with and without backticks
Here is my current code
I also have tried with $var as well as just $var but same
if(!empty($_POST['email'])){
$date = date('dmY'); #Todays Date
$ip = str_replace('.','',$_SERVER['REMOTE_ADDR']); #Visitor IP
$verify = md5($date.$ip); #MD5 ENCRYPT THE 2 VALUES
$fname = $_POST['fname'];
$lname = $_POST['lname'];
$email = $_POST['email'];
$password = md5($_POST['password']);
$link = mysqli_connect($dbh,$dbu, $dbp, $dbn);
$query = mysqli_query($link, "INSERT INTO `users` (`email`,`fname`,`lname`,`verify`,`password`,`joined`)
VALUES($email,$fname,$lname,$verify,$password,$date)");
if($query){
echo "inserted";
}
else {
echo mysqli_error($link);
}
表中还有其他列，但是只有上面的列我想为其余的添加数据，最初可以使用默认值
There are other columns in the table however its only the above columns I want to add data for the rest can use default values initially
我一直在看这段代码，现在我只是无法发现我的问题，我知道它有些愚蠢
I've been looking at this code for so long now I just cant spot my problem, I know its something silly
推荐答案
将变量添加到 SQL 查询中最不会出错的方法是通过准备好的语句添加它.
The most mistake-proof way to add a variable into an SQL query is to add it through a prepared statement.
因此，对于您运行的每个查询，如果至少要使用一个变量，您必须用占位符替换它，然后准备您的查询，然后执行它，分别传递变量.
So, for every query you run, if at least one variable is going to be used, you have to substitute it with a placeholder, then prepare your query, and then execute it, passing variables separately.
首先，您必须更改查询，添加占位符来代替变量.您的查询将变为:
First of all, you have to alter your query, adding placeholders in place of variables. Your query will become:
$sql = "INSERT INTO users (fname, lname) VALUES (?, ?)";
然后，您必须准备它，绑定变量并执行:
Then, you will have to prepare it, bind variables, and execute:
$stmt = mysqli_prepare($conn, $sql);
mysqli_stmt_bind_param($stmt, "ss", $fname, $lname);
mysqli_stmt_execute($stmt);
如您所见，它只是三个简单的命令:
As you can see, it's just three simple commands:
- prepare() 用于发送带有占位符的查询
- bind_param 用于发送带有类型的字符串(s"表示字符串，实际上您可以将它用于任何类型)而不是实际变量.
- 并执行()
通过这种方式，您可以始终确保添加到查询中的数据不会导致任何 SQL 语法错误！作为奖励，此代码也可以防止 SQL 注入！
This way, you can always be sure that not a single SQL syntax error can be caused by the data you added to the query! As a bonus, this code is bullet-proof against SQL injection too!
了解仅在变量周围添加引号是不够的非常重要，并且最终会导致无数问题，从语法错误到 SQL 注入.另一方面，由于准备好的语句的性质，它是一种防弹解决方案，不可能通过数据变量引入任何问题.
It is very important to understand that simply adding quotes around a variable is not enough and will eventually lead to innumerable problems, from syntax errors to SQL injections. On the other hand, due to the very nature of prepared statements, it's a bullet-proof solution that makes it impossible to introduce any problem through a data variable.
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