我的SQL查询有什么问题？ （PHP）

Question

What is wrong with this code? Why can't I get the username from the members table in website database. Here's the screenshot of database information:

I am trying to make a function for it so that I can use it later. Here's the code:

<?php
function get_username($username){
    $host = 'localhost';
    $username = 'root';
    $password = '';
    $database = 'website';
    $con = mysqli_connect($host, $username, $password, $database);

    $query = "SELECT * FROM members WHERE username = '{$username}'";

    $result = mysqli_query($con, $query);

    $row = mysqli_fetch_array($result);

    return $row['name'];

    mysqli_close($con);
}

echo get_username('iamfaizahmed');
?>

Answer 1

Your username is overwritten in the function

$username = 'root'; // here

So no matter what you pass in the function argument it will always use

where username = 'root'

So use a different variable name

Answer 2

you are mixing between $username of the function and $username of your connect variable

change this

 function get_username($username){

to

  function get_username($user){

and do your query like that

  $query = "SELECT * FROM members WHERE username = '$user'";

Answer 3

First thing, your $username variable.
You're passing it through the function and also using it for db connection.

Change your dbusername in the function as $dbusername

Second, the query. Keep it as:

$query = "SELECT * FROM members WHERE username = '$username'";

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That should get your somewhere!