----test.html---
<form method="post" action="submit.php">
<input type="text" name="stuffToInput" />
<input type="submit" name="submit" value="Select the stuff!" />
</form>
---submit.php-----
<?php
$db = new mysqli($host,$user,$pass,$db_name);
$fetchData = $db->query(sprintf("SELECT column_name FROM table_name WHERE column_name = '%s'",
$db->real_escape_string ($_POST['stuffToInput'])));
while($record = $fetchData->fetch_array(MYSQLI_ASSOC)) {
echo $record['column_name']."< br />"; //first column name, however many records
}
mysqli_close($db);
?>