getting only last id in php - php

Question

I have total 7 Id in MySQL table. and I am fetching those Id's from database
code is :
<form class="form-inline" method="POST" action="book.php">
<div class="row-fluid home">
<div class="span3">
<?php
$query=mysql_query("select * from category");
$cat_count = 0;
while($result=mysql_fetch_array($query))
{
$category_id=$result['cat_id'];
$category_type=$result['cat_type'];
$categroy_desc=$result['cat_desc'];
$category_image=$result['cat_images'];
$category_price=$result['cat_price'];
$cat_count += 1;
//$_SESSION["session_category_id"] = $category_id;
?>
<div class="room_selector" data-price="<?php echo $category_price; ?>" data-adults="4" data-kids="2"
<?php if ($cat_count!=1) {echo 'style="display: none;"'; } ?> >
<h5>
<a href="index.php?id=<?php echo $category_id; ?>" class="pull-left">
<i class="icon-chevron-left"></i>
</a>
<?php echo $category_type; ?>
<a href="index.php?id=<?php echo $category_id; ?>" class="pull-right ">
<i class="icon-chevron-right"></i>
</a>
</h5>
<a class="iframe" href="rooms.php">
<img src="data:image/png;base64,<?php echo base64_encode($category_image); ?>" alt="No Photo" />
</a>
<p><?php echo $categroy_desc;?></p><br><Br><bR>
<!--<a class="btn btn-primary btn-large book-now" name="submit" type="submit" href="book.php?id=<?php echo $category_id; ?>">
Check Availability!</a>-->
<?php echo $x=$category_id;
?>
<input type="hidden" name="cat_id" value="<?php echo $category_id; ?>">
<?php $users[] = $result['cat_id'];?>
</div>
<?php
}
?>
<?php echo $category_id;
?>
</div>
<div class="span3 home_calendar">
<div class="form-horizontal">
<div class="control-group">
<label class="control-label pull-left" for="inputEmail">Arrive</label>
<div class="controls">
<input type="text" value="" name="from" class="span2 check-in-date" value="2015/05/22" />
</div>
</div>
</div>
<div class="datepicker_from"></div>
</div>
<div class="span3 home_calendar">
<div class="form-horizontal">
<div class="control-group">
<label class="control-label pull-left" for="inputEmail">Depart</label>
<div class="controls">
<input type="text" value="" name="to" class="span2 check-out-date" value="2015/05/27" />
</div>
</div>
</div>
<div class="datepicker_to"></div>
</div>
<div class="span3">
<div class="form-horizontal">
<div class="control-group">
<label class="control-label" for="inputEmail">Rooms</label>
<div class="controls">
<select class="span1 select_rooms" name="no_of_selected_room">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputEmail">Adults per room</label>
<div class="controls">
<select class="span1 select_adults" name="no_of_adults">
<option>1</option>
<option>2</option>
<option>3</option>
</select>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputEmail">Kids per room</label>
<div class="controls">
<select class="span1 select_kids" name="no_of_kids">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputEmail">extra person</label>
<div class="controls">
<select class="span1 select_kids">
<option>1</option>
<option>2</option>
<option>3</option>
</select>
</div>
</div>
</div>
<div id="total_price" class="price" name="price"></div>
<input type="submit" class="btn btn-primary btn-large book-now" name="submit" value="Check Availability!">
<!--<a class="btn btn-primary btn-large book-now" type="submit" href="book.php?id=">Check Availability!</a>-->
</div>
The $category_id is the main key to my project. once user will select the room then the $category_id will select based on that.
I am trying to send this id to other page using one form
//book.php
if(isset($_POST['submit']))
{
$n_cat_from = $_POST['from'];
$n_cat_to = $_POST['to'];
$n_no_of_selected_rooms = $_POST['no_of_selected_room'];
$n_no_of_adults = $_POST['no_of_adults'];
$n_no_of_kids = $_POST['no_of_kids'];
$current_Category_id = $_POST['cat_id'];
echo "id;;;;;;;;;;;;" . $current_Category_id;
}
?>
When I try to echo that id I am getting only last id in the database (after user selecting different id also )
where I am wrong ? why it is taking last Id ? help me

Answer 1

if you want to store multiple values in a hidden input with the same name, you have to add [] after the name, like this:
<input type="hidden" name="cat_id[]" value="<?php echo $category_id; ?>">
<?php $users[] = $result['cat_id'];?>
this way, you should have an array in book.php:
$_POST[cat_id] => Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 )