Query with WHERE clause not working using mysqli bind_param() [closed] - php

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I am creating a webservice where I need to get some data from mysql and retrieve it in a mobile app.
I have been trying all day to do a query with a WHERE statement, but no success.
The normal query, without the WHERE is working perfectly though.
Also I went through all the similar questions on stack overflow and other forums, but none is the same problem as mine.
This is my current code:
<?php
$con=mysqli_connect("Hidden credentials");
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
if ($stmt = $con->prepare("SELECT
team.id as teamId,
team.team_name as teamName,
user.id as userId,
user.username as username,
team_members.role as role
FROM team_members
inner join user on team_members.user_id = user.id
inner join team on team_members.team_id = team.id
where user.id = ?
")) {
$stmt->bind_param("i", $id);
$stmt->execute();
$result = $stmt->get_result();
$resultArray = array();
$tempArray = array();
while($row = $result->fetch_object())
{
$tempArray = $row;
array_push($resultArray, $tempArray);
}
echo json_encode($resultArray);
$stmt->close();
}
?>
If I remove the line where user.id=? it gets the data correctly.
Running the query on phpMyAdmin is everything ok, so it's not any issue on the query.

Answer 1

The variable $id doesn't exist (in your code). If you want to set the variable dynamically you can use $id = $_GET['id'];. This will take the value from the url and put it in the variable!

Answer 2

Your QUERY doesn't work because your variable id doesn't exists (in code what you showing).
Fix: create variable id and put some data to this variable.
For example:
$id = 5;
Or dynamcially:
From URL with GET method:
$id = $_GET['id'];
this allows you to get parameter from URL. But you must set this parameter by link. For example: <a href="index.php?id=5">. By clicking on this a tag you will be redirected to page index.php with parameter id which equals to 5.
From POST method:
for example you have this FORM:
<form method="post">
<input type="number" name="id">
<input type="submit" name="submit">
</form>
after submiting this FORM values will be saved in $_POST. You can access them by $_POST["name"]. In this case $_POST["id"].
$id = $_POST["id"];
From SESSION:
$id = $_SESSION["id"];
but first you have define $_SESSION["id"]. You can access this variable ($_SESSION["id"]) in other pages of your domain.