this is a chat box design displaying the sender and receiver messages - php

Question

Basically, this code works but it displays both the sender and receiver in the same color
what do i want? i want the sender colour to be different with the receiver message color
<?php
require_once 'cn.php';
session_start(); // startsession .line17 (username || usernameto='.$username.')
//messages sent or received by the $_SESSION or $_GET["ident"]..line 26
require_once 'protect.php';
$username=$_SESSION['UserID'];
$fiveMinutesAgo = time() - 1000;
$to=$_SESSION['UserTo'];
$sql = 'SELECT
username, message_content,message_file, message_time,usernameto
FROM
messages
WHERE
message_time > ' . $fiveMinutesAgo . '
and ((username='.$username.'
and usernameto='.$to.') or (usernameto='.$username.'
and username='.$to.'))
ORDER BY
message_time';
$result = mysql_query($sql, $cn) or
die(mysql_error($cn));
//mysql_query ("Update messages set message_file= replace(message_file,' ','');
while ($row = mysql_fetch_assoc($result)) {
$hoursAndMinutes = date('g:ia', $row['message_time']);
$mycontent=$row['message_content'];
$myfile=$row['message_file'];
$playfile="<A href=upload/$myfile> $myfile </A>";
/*************************************************************************************************/
echo '<i><p style="font-family:arial;color:purple;font-size:15px;"><strong>' . $row['username']. '</strong>: <em>(' . $hoursAndMinutes . ')</em> ' . $playfile . $mycontent.'</i></p>';
}
?>

Answer 1

Assuming that $username and your column username contains a userID: Check if $username is the same as $row['username']. If it is, your message is from the sender.
if ($row['username'] == $username)
$color = 'red';
else
$color = 'purple';
echo '<i><p style="font-family:arial;color:'.$color.';font-size:15px;"><strong>' . $row['username']. '</strong>: <em>(' . $hoursAndMinutes . ')</em> ' . $playfile . $mycontent.'</i></p>';
Also: This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information.
http://www.php.net/manual/en/function.mysql-query.php

Answer 2

you need to know when the sendername is the same people who has the session open if the sendername else is the receiver