While Loop on specific id only - php

Question

<?php
class Friends {
public function __construct() {
global $DB, $name, $f_name;
$name = $_SESSION['name'];
if (isset($_POST['submitted'])) {
$f_name = mysql_real_escape_string($_POST['f_name']);
}
}
public function AddList() {
global $DB,$name;
echo "<center>";
$result = $DB->query(
"SELECT * FROM friends WHERE user_name!='{$name}' AND friend_name!='{$name}' "
);
while($row = mysql_fetch_array($result)) {
echo "<form method='post'>";
echo '<input type="hidden" value=' . $row['user_name'] . ' name="f_name"</th> ';
echo '<tr>';
echo '<th><b><font color="#663300">' . $row['user_name'] . '</font></b></th>';
$this->auth();
echo "</form>";
echo "</tr>";
echo "</tr>";
}
echo "</table>";
echo "</center>";
}
public function auth() {
global $name,$f_name,$DB;
$authprove = $DB->query("SELECT * FROM approval WHERE sender_id='{$name}'");
if (mysql_num_rows($authprove) > 0) {
echo '<th><b>Approving...</th>';
} else {
echo '<th><b><input type="submit" name="submitted" value="Add"></th>';
}
}
}
$F= new Friends();
?>
A bit explaination :
Is that possible to make only a specific id to output Approving and another one output Add.
Like this
When table(approval) :
---- sender_id || receive_id
---- Admin || Guest
Output Friends.php :
---- Add friends :
---- Guest -> Wait for approval
---- Guest2 -> Add as Friend
---- Guest3 -> Add as Friend

Answer 1

You are performing your task very unefficiently: you'll be running N+1 queries if you have N users. You could do it with a single query using a JOIN. In that case, you'd have a single loop and no problem doing what you need.
Something like:
$query = "
SELECT
f.id,
f.user_name,
f.fullname,
a.status
FROM
friends f
LEFT OUTER JOIN approval a ON (f.id=a.sender_id)
WHERE
user_name!='{$name}'
AND friend_name!='{$name}'
";
$result = $DB->query( $query );
while( $row = mysql_fetch_array( $result ) ) {
echo $row['f.fullname'];
if ( $row['a.status'] == 'approved' ) echo "Add as Friend";
else echo "Add as Friend";
}