call or create session variable in SUM - php

Question

I am not very familiar with PHP or MySQL, but after researching here I have been able to learn and get very close to what I need and build my first sum query. I am trying to read the database and sum values based on several variables.
I need the reservation_pax from the reservations table where reservation_time is 8:00 where reservation_hidden = 0 and reservation_date is something. I can manually enter the date and it works. I am now trying to use a session code already in the script or find a way to to dynamically add based on selected date.
Here is the code I have working without the dynamic aspect or session.
$result = mysql_query("SELECT SUM(reservation_pax)
FROM reservations
WHERE reservation_time = '8:00:00'
AND reservation_date = '2014-10-27'
AND reservation_hidden ='0'") ;
if ($result === false) {
die(mysql_error()); // TODO: better error handling
}
while($row = mysql_fetch_array($result)) {
echo $row['SUM(reservation_pax)'];
}
Here is the full code of the page where I entered the above addition. Can anyone help me figure out how to call the selected date rather than having to manually enter.
<!-- Begin reservation table data -->
<br/>
<table class="global resv-table-small" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<?php
echo "<td class='noprint'> </td>";
echo "<td>Time</td>";
echo "<td>Guests/Type</td>";
echo "<td>Name</td>";
echo "<td>Special Instructions/Notes</td>";
echo "<td class='noprint'>Table</td>";
echo "<td class='noprint'>Status</td>";
echo "<td class='noprint'>Created</td>";
echo "<td class='noprint'>Details/Delete</td>";
echo "</tr>";
// Clear reservation variable
$reservations ='';
if ($_SESSION['page'] == 1) {
$reservations = querySQL('all_reservations');
}else{
$reservations = querySQL('reservations');
}
// reset total counters
$tablesum = 0;
$guestsum = 0;
if ($reservations) {
//start printing out reservation grid
foreach($reservations as $row) {
// reservation ID
$id = $row->reservation_id;
$_SESSION['reservation_guest_name'] = $row->reservation_guest_name;
// check if reservation is tautologous
$tautologous = querySQL('tautologous');
echo "<tr id='res-".$id."'>";
echo "<td";
// daylight coloring
if ($row->reservation_time > $daylight_evening){
echo " class='evening noprint'";
}else if ($row->reservation_time > $daylight_noon){
echo " class='afternoon noprint'";
}else if ($row->reservation_time < $daylight_noon){
echo " class='morning noprint'";
}
echo " style='width:10px !important; padding:0px;'> </td>";
echo "<td id='tb_time'";
// reservation after maitre message
if ($row->reservation_timestamp > $maitre['maitre_timestamp'] && $maitre['maitre_comment_day']!='') {
echo " class='tautologous' title='"._sentence_13."' ";
}
echo ">";
echo "<strong>".formatTime($row->reservation_time,$general['timeformat'])."</strong></td>";
echo "<td id='tb_pax'><strong class='big'>".$row->reservation_pax."</strong> <span class='noprint'>";
printType($row->reservation_hotelguest_yn);
//echo "<img src='images/icons/user-silhouette.png' class='middle'/>";
echo "</span></td><td style='width:10%' id='tb_name'><span class='noprint'>".printTitle($row->reservation_title)."</span><strong> <a id='detlbuttontrigger' href='ajax/guest_detail.php?id=".$id."'";
// color guest name if tautologous
if($tautologous>1){echo" class='tautologous tipsy' title='"._tautologous_booking."'";}
echo ">".$row->reservation_guest_name."</a></strong>";
// old reservations symbol
if( (strtotime($row->reservation_timestamp) + $general['old_days']*86400) <= time() ){
echo "<img src='images/icons/clock-bolt.png' class='help tipsyold middle smicon' title='"._sentence_11."' />";
}
// recurring symbol
if ($row->repeat_id !=0) {
echo " <img src='images/icons/loop-alt.png' alt='"._recurring.
"' title='"._recurring."' class='tipsy' border='0' >";
}
echo"</td><td style='width:10%' id='tb_note'>";
if ($_SESSION['page'] == 1) {
echo $row->outlet_name;
}else{
echo $row->reservation_notes;
}
echo "</td>";
if($_SESSION['wait'] == 0){
echo "<td class='big tb_nr' style='width:85px;' id='tb_table'><img src='images/icons/table_II.png' class='tipsy leftside noprint' title='"._table."' /><div id='reservation_table-".$id."' class='inlineedit'>".$row->reservation_table."</div></td>";
}
echo "<td class='noprint'><div>";
getStatusList($id, $row->reservation_status);
echo "</div></td>";
echo "<td class='noprint'>";
echo "<small>".$row->reservation_booker_name." | ".humanize($row->reservation_timestamp)."</small>";
echo "</td>";
echo "<td class='noprint'>";
// MOVE BUTTON
// echo "<a href=''><img src='images/icons/arrow.png' alt='move' class='help' title='"._move_reservation_to."'/></a>";
// WAITLIST ALLOW BUTTON
if($_SESSION['wait'] == 1){
$leftspace = leftSpace(substr($row->reservation_time,0,5), $availability);
if($leftspace >= $row->reservation_pax && $_SESSION['outlet_max_tables']-$tbl_availability[substr($row->reservation_time,0,5)] >= 1){
echo" <a href='#' name='".$id."' class='alwbtn'><img src='images/icons/check-alt.png' name='".$id."' alt='"._allow."' class='help' title='"._allow."'/></a> ";
}
}
// EDIT/DETAIL BUTTON
echo "<a href='?p=102&resID=".$id."'><img src='images/icons/pen-fill.png' alt='"._detail."' class='help' title='"._detail."'/></a> ";
// DELETE BUTTON
if ( current_user_can( 'Reservation-Delete' ) && $q!=3 ){
echo"<a href='#modalsecurity' name='".$row->repeat_id."' id='".$id."' class='delbtn'>
<img src='images/icons/delete.png' alt='"._cancelled."' class='help' title='"._delete."'/></a>";
}
echo"</td></tr>";
$tablesum ++;
$guestsum += $row->reservation_pax;
}
}
?>
</tbody>
<tfoot>
<tr style="border:1px #000;">
<td class=" noprint"></td><td></td>
<td colspan="2" class="bold"><?php echo $guestsum;?> <?php echo _guest_summary;?></td>
<td></td>
<td colspan="2" class="bold"><?php echo $tablesum;?> <?php echo _tables_summary;?></td>
<td colspan="2" class="bold"><?php
$result = mysql_query("SELECT SUM(`reservation_pax`) FROM `reservations` WHERE `reservation_time` = '8:00:00' AND `reservation_date` = '{$_SESSION['selectedDate']}' AND `reservation_hidden` ='0'") ;
if($result === FALSE) {
die(mysql_error()); // TODO: better error handling
}
while($row = mysql_fetch_array($result))
{
echo $row['SUM(reservation_pax)'];
}
?>
<?php echo '/ 40 ', _guest_summary, ' -8:00 AM';?></td>
<td></td>
<?php
if($_SESSION['wait'] == 0){
//echo "<td></td>";
}
?>
</tr>
</tfoot>
</table>
<!-- End reservation table data -->

Answer 1

you can use alias field, as:
$result = mysql_query("SELECT SUM(reservation_pax) AS reserve_sum
FROM reservations WHERE reservation_time = '8:00:00'
AND reservation_date = '2014-10-27'
AND reservation_hidden ='0'"
) ;
....
and get access it as:
while($row = mysql_fetch_array($result))
{
echo $row['reserve_sum'];
}

Answer 2

$result = mysql_query("SELECT SUM(reservation_pax) FROM reservations WHERE reservation_time = '8:00:00' AND reservation_date = '{$_SESSION['selectedDate']}' AND reservation_hidden ='0'") ;
if($result === FALSE) {
die(mysql_error()); // TODO: better error handling
}
while($row = mysql_fetch_array($result))
{
echo $row['SUM(reservation_pax)'];
}
?>