php mysql search using boxlist - php

Question

I am looking for a way to search for data from the database using input type box list, I tried make the code but it doesn't display anything:
html code:
<form action="users.php" method="post" name="searching">
<select name="users">
<option selected="selected" value="">-- select --</option>
<option value="1">user1</option>
<option value="2">user2</option>
<option value="3">user3</option>
</select>
<input type="submit" name="search" value="find">
</form>
php code:
if (isset($_POST['users'])) {
$key = trim ($_POST['users']);
$s = "SELECT * FROM users where user_name LIKE '%$key %'";
$res = mysql_query($s) or die('query did not work');
while($row = mysql_fetch_array( $res ))
{
?>
User ID: <?php echo $row['user_id'] ?>
User Name: <?php echo $row['user_name'] ?>
<?php
}
?>
when I try the code I didn't get any result and when I remove the while loop and put this instead of it :
<?php echo $key; ?>
it gives me the numbers of the selected value, for example if I select user2 the result will be 2. and I want the result to be user id and user name.

Answer 1

you need to fetch all the user name in your drop down select box
<select name="users">
<option selected="selected" value="">-- select --</option>
<?php $s2 = "SELECT * FROM users";
$q2=mysql_query($s2) or die($s2);
while($rw=mysql_fetch_array($q2))
{
echo '<option value="'.$rw['userid'].'">'.$rw['username'].'</option>';
}</select>
?>
<?php if (isset($_POST['search'])) { // submit button name here
$key = $_POST['users'];
$s = "SELECT * FROM users where user_id='".$key."'";
$res = mysql_query($s) or die($s);
while($row = mysql_fetch_array( $res ))
{
?>
User ID: <?php echo $row['user_id'] ?>
User Name: <?php echo $row['user_name'] ?>
<?php
}
?>

Answer 2

edit your html to this,you will get the in $_POST which will be in value='something'
<form action="users.php" method="post" name="searching">
<select name="users">
<option selected="selected" value="">-- select --</option>
<option value="user1">user1</option>
<option value="user2">user2</option>
<option value="user3">user3</option>
</select>
<input type="submit" name="search" value="find">
</form>
Or if value is the id of user then change query to this
$s = "SELECT * FROM users where user_id='".$key."'";