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我想在我的網站中添加一些統計數據，我想每個月顯示我的收入，當汽車從租金回報（當天：預期回報月）。 我想計算每個月的收入（租賃價格）總額（預期退貨日期），有人可以幫助我，我該怎麼做？ 
計算一個數組在php中的總數CakePHP
，這是查看/位置/ admin_index.ctp：
<div class="row" >
<!--<meta http-equiv="refresh" content="5; URL=http://dhafer.com/admin/locations">-->
<div class="col-lg-12">
<h1 class="page-header" style="font-family: Kaushan Script';">Administrator<small> Locations management</small></h1>
<ol class="breadcrumb">
<li class="active">
<i class="fa fa-car"></i> Locations
</li>
</ol>
<div class="panel panel-default">
<div class="panel-heading" style="font-family: Kaushan Script';"><h3> Locations </h3></div>
<div class="table-responsive">
<table class="table table-bordered table-hover table-striped" style="font-family: 'Montserrat';">
<thead>
<tr >
\t
\t \t \t \t \t \t \t \t \t \t <th class="actions"><?php echo __('Actions'); ?></th>
\t \t \t \t \t \t \t \t \t \t <th><?php echo $this->Paginator->sort('id'); ?></th>
\t \t \t \t \t \t \t \t \t \t <th><?php echo $this->Paginator->sort('status'); ?></th>
\t \t \t \t \t \t \t \t \t \t <th><?php echo $this->Paginator->sort('departure_date'); ?></th>
\t \t \t \t \t \t \t \t \t \t <th><?php echo $this->Paginator->sort('expected_return_date'); ?></th>
\t \t \t \t \t \t \t \t \t \t <th><?php echo $this->Paginator->sort('user_id'); ?></th>
\t \t \t \t \t \t \t \t \t \t <th><?php echo $this->Paginator->sort('agency_id'); ?></th>
\t \t \t \t \t \t \t \t \t \t <th><?php echo $this->Paginator->sort('car_id'); ?></th>
<th class="actions"><?php echo __('Decision'); ?></th>
<th ><?php echo __('Days'); ?></th>
<th ><?php echo __('Rental price '); ?></th>
</tr>
</thead>
<tbody>
<?php foreach ($locations as $location): ?>
\t <tr class="<?php if($location['Location']['status']== '0'):echo "danger";else: echo "success";endif; ?>" style="color:black;">
<td class="actions">
<?php echo $this->Html->link(' <i class="fa fa-eye" style="color:black;"></i>', array('action' => 'view', $location['Location']['id']),array('class'=>'btn-sm btn-sousse','escape' => false)); ?>
<?php echo $this->Html->link('<i class="fa fa-pencil-square-o" style="color:white;"></i>', array('action' => 'edit', $location['Location']['id']),array('class'=>'btn-sm btn-primary','escape' => false)); ?>
<?php echo $this->Html->link('<i class="fa fa-times-circle" style="color:white;"></i>', array('action' => 'delete', $location['Location']['id']),array('class'=>'btn-sm btn-slama','escape' => false), array(), __('Are you sure you want to delete # %s?', $location['Location']['id'])); ?>
</td>
<td style="font-family: 'Montserrat';"><?php echo $this->Html->link($location['User']['id'], array('controller' => 'users', 'action' => 'view', $location['User']['id'])); ?></td>
<td style="font-family: 'Montserrat';">
<?php
if($location['Location']['status'] != 0){
echo __('Accepted');}else{
echo __('Waiting response');
}
?>
</td>
<td style="font-family: 'Montserrat';"><?php echo h($location['Location']['departure_date']); ?></td>
<td style="font-family: 'Montserrat';"><?php echo h($location['Location']['expected_return_date']); ?></td>
<td style="font-family: 'Montserrat';"><?php echo h($location['User']['first_name']); ?></td>
<td style="font-family: 'Montserrat';"><?php echo $this->Html->link($location['Agency']['name'], array('controller' => 'agencies', 'action' => 'view', $location['Agency']['id'])); ?></td>
<td style="font-family: 'Montserrat';"><?php echo $this->Html->link($location['Car']['title'], array('controller' => 'cars', 'action' => 'view', $location['Car']['id'])); ?></td>
<td style="font-family: 'Montserrat';">
<?php
if($location['Location']['status'] != 0){
echo $this->Html->link( "Delete", array('action'=>'delete', $location['Location']['id']),array('class'=>'btn btn-danger'));}else{
echo $this->Html->link( "Accept", array('action'=>'activate', $location['Location']['id']),array('class'=>'btn btn-success'));
}
?>
</td>
<td style="font-family: 'Montserrat';">
<?php
$temp1=$location['Location']['expected_return_date'];
$temp2 = $location['Location']['departure_date'];
$date1 = new DateTime($temp1);
$date2 = new DateTime($temp2);
$diff=$date1->diff($date2);
$days=$diff->format('%a days');
echo $days ;
?></td><td style="font-family: 'Montserrat';">
<?php
echo '$ '.$location['Car']['price'] * $days;
;?>
</td>
</tr>
<?php endforeach; ?>
</tbody>
</table>
<p>
<?php
echo $this->Paginator->counter(array(
'format' => __('Page {:page} of {:pages}, showing {:current} records out of {:count} total, starting on record {:start}, ending on {:end}')
));
?> </p>
<div class="paging">
<?php
echo $this->Paginator->prev('< ' . __('previous'), array(), null, array('class' => 'prev disabled'));
echo $this->Paginator->numbers(array('separator' => ''));
echo $this->Paginator->next(__('next') . ' >', array(), null, array('class' => 'next disabled'));
?>
</div>
</div>
</div>
<?php echo $this->Html->link(' <i class="fa fa-rss-square fa-1x" style="color:orange;"></i>', array('action' => 'admin_getlocations.xml'),array('class'=>'btn-lg btn-default','escape' => false)); ?>
</div>
</div>
<script type="text/javascript">
//setTimeout(function(){
//window.location.reload(1);
//}, 10000);
</script>有人能幫助我嗎？