Checkbox button not updating a selected row? - php

Question

My selector when selected all is updating only 1 row? however if i select a row, it cannot be updated? please see my code if something's wrong, needed help.
This is the form:
<form action="read_message.php" method="post">
<div class="pull-right">
<button class="btn btn-info" name="read"><i class="icon-check"></i> Read</button>
Check All <input type="checkbox" name="selectAll" id="checkAll" />
<script>
$("#checkAll").click(function () {
$('input:checkbox').not(this).prop('checked', this.checked);
});
</script>
</div>
<ul class="nav nav-pills">
<li class="active"><i class="icon-envelope-alt"></i>inbox</li>
<li class=""><i class="icon-envelope-alt"></i>Send messages</li>
</ul>
<?php
$query_announcement = mysql_query("select * from message_received
LEFT JOIN user ON user.user_id = message_received.user_id
where message_received.receiver_id = '$session_id' order by date_sent DESC
")or die(mysql_error());
$count_my_message = mysql_num_rows($query_announcement);
if ($count_my_message != '0'){
while($row = mysql_fetch_array($query_announcement)){
$id = $row['message_id'];
$id_2 = $row['message_id'];
$fn = $row['firstname'];
$ln = $row['lastname'];
$status = $row['message_status'];
$sender = $row['user_id'];
$sender_name = $fn.' '.$ln;
$receiver = $row['receiver_id'];
?><div class="alert alert-info">
<div class="post" id="del<?php echo $id; ?>">
<div class="message_content">
<?php echo $row['content']; ?>
</div>
<div class="pull-right">
<?php if ($status == 'read'){
}else{ ?>
<input id="" class="" name="selector[]" type="checkbox" value="<?php echo $id; ?>">
<?php } ?>
</div>
<hr>
Send by: <strong><?php echo $fn.' '.$ln; ?></strong>
<i class="icon-calendar"></i> <?php echo $row['date_sent']; ?>
<div class="pull-right">
<a class="btn btn-link" href="#reply<?php echo $id; ?>" data-toggle="modal" ><i class="icon-reply"></i> Reply </a>
</div>
<div class="pull-right">
<a class="btn btn-link" href="#<?php echo $id; ?>" data-toggle="modal" ><i class="icon-remove"></i> Remove </a>
<?php include("remove_inbox_message_modal.php"); ?>
<?php include("reply_inbox_message_modal_user.php"); ?>
</div>
</div>
</div>
<?php }}else{ ?>
<div class="alert alert-info"><i class="icon-info-sign"></i> No Message Inbox</div>
<?php } ?>
</form>
However, nevermind the isset for reply, the problem is the first function for isset read, what's wrong with the query? this is the function for the selector, read_message.php,
<?php include('connect.php'); ?>
<?php
include('session.php');
if (isset($_POST['read'])){
$id=$_POST['selector'];
$N = count($id);
for($i=0; $i < $N; $i++)
{
$result = mysql_query("update message_received set message_status = 'read' where message_id='$id[$i]'");
}
echo "<script> alert('Successfully Updated') </script>";
echo " <script>location.replace('messages.php')</script>";
}
?>
<?php
if (isset($_POST['reply'])){
$sender = $_POST['sender'];
$receiver = $_POST['receiver'];
$id2=$_POST['id2'];
$qwe = $_POST['qwe'];
mysql_query("update message_received set message_status = 'read' where message_id='$id2'");
mysql_query("insert into message_received (user_id,receiver_id,content,date_sent) values('$receiver','$sender','$qwe',NOW())")or die(mysql_error());
mysql_query("insert into message_sent (receiver_id,user_id,content,date_sent) values('$sender','$receiver','$qwe',NOW())")or die(mysql_error());
echo "<script> alert('Your message has been sent') </script>";
echo " <script>location.replace('messages.php')</script>";
?>
<script>
alert('Message Sent');
window.location ="messages.php";
</script>
<?php
}
?>