用php获取id

Question

I have a customer table. Each customer has a specific ID. In my project(ecommerce website) I want to store the ID of the user in a $_SESSION['user_id'] when he/she successfully login. How do I do that? What do I need to add? Here's my code:

<?php
// establishing the MySQLi connection
$con = mysqli_connect("localhost","root","","ecommerce");
// checking the user
if(isset($_POST['login'])){
    $email = mysqli_real_escape_string($con,$_POST['c_email']);
    $pass = mysqli_real_escape_string($con,$_POST['pass']);
    $sel_user = "select * from customer where customer_email ='$email' AND customer_pass='$pass'";
    $run_user = mysqli_query($con, $sel_user);
    $check_user = mysqli_num_rows($run_user);
    if($check_user>0){
        $_SESSION['customer_email']=$email;
        echo "<script>window.open('index.php','_self')</script>";
    } else {
        echo "<script>alert('Email or password is not correct, try again!')</script>";
    }
}
?>

Answer 1

First, as @chris85 mentioned, call session_start() at the top of your script.

Then, you're almost there. First, you need to get the result object from the results.

$rows = array();

while ($row = mysql_fetch_assoc($run_user)) {
    $rows[] = $row; // Same as array_push($rows, $row) but has better performance when pushing a single item.
}

Then, assuming we know there is only one row returned:

$customerData = $rows[0];

Cool. Now, set whatever SESSION variables you want:

$_SESSION["user_id"] = $customerData["user_id"];
...

Also, as has been noted in the comments, please please please do not ever store a user's password as plain text. You should hash and salt it. Here is a good starter post to read through: Best way to store password in database