How to fetch $POST data and put in database - php

Question

Hi i have a simple form that uploads files and i want to get the id value using $POST and put in the database but my code is incorrect. Here is my code. I just want to ask if im doing the passing and fetching of $POST correctly? thanks
echo "<form action='process.php' method='post' enctype='multipart/form-data' id='uploadfile'>";
echo "<input type='hidden' name='MAX_FILE_SIZE' value='100000' />";
echo "<select name='selectedValue'>";
echo '<option selected="selected">' .'Choose a User'. '</option>';
foreach ($registeredUsers as $key => $value) {
$registered = JFactory::getUser($value);
echo '<option name="id" value="'.$registered->id.'">'.$registered->name.'</option>';
}
echo "</select>";
echo "Choose a file to Upload:";
echo "<input name='uploadedfile' type='file' /> <br/>";
echo '<input type="submit" name="submit" value="Upload">';
echo "</form>";
Here is the process.php file.
if(isset($_POST['selectedValue']))
{
$selectedValue = $_POST['id'];
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query = "INSERT INTO sample_table ('user_id') VALUES ('$_POST[id]')"
$db->setQuery($query);
$result = $db->execute();
}

Answer 1

echo "<form action='process.php' method='post' enctype='multipart/form-data' id='uploadfile'>";
echo "<input type='hidden' name='MAX_FILE_SIZE' value='100000' />";
echo "<select name='id'>";
echo '<option selected="selected">' .'Choose a User'. '</option>';
foreach ($registeredUsers as $key => $value) {
$registered = JFactory::getUser($value);
echo '<option value="'.$registered->id.'">'.$registered->name.'</option>';
}
echo "</select>";
echo "Choose a file to Upload:";
echo "<input name='uploadedfile' type='file' /> <br/>";
echo '<input type="submit" name="submit" value="Upload">';
echo "</form>";
process.php
if(isset($_POST['id']))
{
$selectedValue = $_POST['id'];
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query = "INSERT INTO sample_table ('user_id') VALUES ('$selectedValue')";
$db->setQuery($query);
$result = $db->execute();
}
Okay. So you had some problems, you've set the "name" on the options, which is wrong, you have to set that on the .
Second, you missed a semicolon at the end on $query.
And last, i've chaged to check if the a value has been chosed from the dropdown and to set selectedValue to that, and use that in the query.