Q:

How to get the previous day (continous)

Hello guys I want to get the information of previous date or last day only when I press the button and it will display the all information last day (saturday) and if I click the button again it will shows information of last last day (friday) and if I click it again (thursday) thanks for helping me guys
EDITED:
generate_attendance.php
if(isset($_POST['submit1'])){
                                 $prev_date= date('Y/m/d',strtotime("-1 days"));

                                    $query=mysqli_query($dbcon,"select * from attendance where date_added '$prev_date'")or die(mysql_error());
                                    while($row=mysqli_fetch_array($query)){

                                    $attendance_id=$row['attendance_id'];

                                    ?>

                                    <tr>
                                       <td><?php echo $row['lastname'].', '.$row['firstname']; ?></td>
                                       <td><?php echo $row['course']; ?></td>
                                       <td><?php echo $row['type']; ?></td>
                                       <td><?php echo $row['year_level']; ?></td>                                           <td><?php echo $row['date_added']; ?</td>                                
                                    </tr>
                                    <?php

            <div class="controls">

                            <button name="submit1" type="submit1" class="btn btn-success"><i class="icon-plus-sign icon-large"></i> Previous Day</button>
                </div>
            </div>

generate_attendance.php (full code)
<div class="container">
    <div class="margin-top">
        <div class="row">   
                            <div class="alert alert-info">
                                <button type="button" class="close" data-dismiss="alert">&times;</button>
                                <strong><i class="icon-user icon-large"></i>&nbsp;Attendance Report</strong>
                            </div>

    <div class="span12">    
       <center class="title">
                    <h1>Attendance List</h1>
                    </center>

                            <div class="pull-right">
                            <a href="" onclick="window.print()" class="btn btn-info"><i class="icon-print icon-large"></i> Print</a>
                            </div>  
    <form method="post">
    <div class="span3">

                                        <div class="control-group">
            <label class="control-label" for="inputEmail"><!-- Attendance Report --></label>
            <div class="controls">
            <label class="control-label" for="inputEmail">From</label>
                <div class="controls">
                <input type="date" name="from_date" id="date1" alt="date" class="IP_calendar" title="d/m/Y">
                </div>
            </div>
        </div>
            <div class="control-group"> 
                <label class="control-label" for="inputEmail">To Date</label>
                <div class="controls">
                    <input type="date" name="to_date" id="date2" alt="date" class="IP_calendar" title="d/m/Y">
            <!--    <input type="text"  class="w8em format-d-m-y highlight-days-67 range-low-today" name="due_date" id="sd" maxlength="10" style="border: 3px double #CCCCCC;" required/> -->
                </div>
            </div>
            <div class="control-group"> 
                <div class="controls">

                            <button name="submit" type="submit" class="btn btn-success"><i class="icon-plus-sign icon-large"></i> Search</button>
                </div>
            </div>
            <div class="controls">

                            <button name="submit1" type="submit1" class="btn btn-success"><i class="icon-minus-sign icon-large"></i> Previous Day</button>
                </div>
            </div>

            <div class="span8">
                    <div class="alert alert-success"><strong>Attendance Report</strong></div>
                        <table cellpadding="0" cellspacing="0" border="0" class="table" id="example">

                            <thead>
                                <tr>

                                        <th>Name</th>
                                        <th>Program Code</th>
                                        <th>Type</th>
                                        <th>Year level</th>
                                        <th>Date Log-in</th>

                                </tr>
                            </thead>
                           <tbody>
                                <?php
                    if(isset($_POST['submit'])){
                                    $from_date=$_POST['from_date'];
                                    $to_date=$_POST['to_date'];

                                    $query=mysqli_query($dbcon,"select * from attendance where date_added between '$from_date' and '$to_date'")or die(mysql_error());
                                    while($row=mysqli_fetch_array($query)){

                                    $attendance_id=$row['attendance_id'];

                                    ?>

                                    <tr>
                                       <td><?php echo $row['lastname'].', '.$row['firstname']; ?></td>
                                       <td><?php echo $row['course']; ?></td>
                                       <td><?php echo $row['type']; ?></td>
                                       <td><?php echo $row['year_level']; ?></td>
                                       <td><?php echo $row['date_added']; ?></td>

                                    </tr>
                                    <?php
                                    }}
?>

       <?php

                    if(isset($_POST['submit1'])){

                                      $prev_date= date('Y/m/d',strtotime("-1 days"));

                                    $query=mysqli_query($dbcon,"select * from attendance where date_added between '$curr_date' and '$prev_date'")or die(mysql_error());
                                    while($row=mysqli_fetch_array($query)){

                                    $attendance_id=$row['attendance_id'];

                                    ?>

                                    <tr>
                                       <td><?php echo $row['lastname'].', '.$row['firstname']; ?></td>
                                       <td><?php echo $row['course']; ?></td>
                                       <td><?php echo $row['type']; ?></td>
                                       <td><?php echo $row['year_level']; ?></td>
                                       <td><?php echo $row['date_added']; ?></td>

                                    </tr>
                                    <?php
                                    }}
                                    ?>

                            </tbody>
                        </table>

            </form>
        </div>      
        </div>      

        </div>
    </div>
</div>

A:

Probably pass a query parameter, that indicates how many dates it should subtract, so the url looks like this:
yourphpscript.php? days = 3

Then you can get that in the php, and change the date building:
$days = $_GET["days"];
if(!isset($days)){
 $days = 1;
}
$days = intval($days);
$prev_date= date('Y/m/d',strtotime("-".$days." days"));

So now the only thing thats missing, is to change the url of the next request, which would look like this:
<form href="?days=<?php echo $days+1;?>" >

