Refer to objects within a loop in php - php

Question

I would like to use a for loop to access 10 objects of the same class.
The reason is that I want to make a table of the data and I don't find it proper to write by hand all the html markup for each row (object) on the table.
My code is :
<?php
for ($i=1;$i<=10;$i++){
?>
<tr>
<td><? echo $i;?></td><td><?php echo $office1->pc;?></td>
<td><?php echo $office1->pc*$office1->pcPowerPerUnit;?></td>
<td><? echo $office1->printer;?></td>
<td><?php echo $office1->printer*$office1->printerPowerPerUnit;?></td>
<td><? echo $office1->lights;?></td>
<td><?php echo $office1->lights*$office1->lightsPowerPerUnit;?></td>
<td><? echo $office1->aircondition;?></td>
<td><?php echo $office1->aircondition*$office1->airconPowerPerUnit;?></td>
<td><? echo $office1->server;?></td>
<td><?php echo $office1->server*$office1->serverPowerPerUnit;?></td>
</tr>
<?php } ?>
What I thought that could be done is to change the references $office1->pc (for example) to $office[$i]->pc or something like that but that doesn't seem to work. I also searched for object iteration in the php manual but that wasn't helpful.
The number of objects is fixed (10) and the properties are already calculated and ready to be echoed out.

Answer 1

You can use a special syntax to refer to your variables like that. Ty this:
<?php echo ${'office'.$i}->pc;?>

Answer 2

Use variable variables:
for ($i = 1; $i <= 10; $i++) {
// ...
$officeVar = 'office' . $i;
// Now you can use $officeVar as a variable variable:
$$officeVar->pc;
// equivalent to:
$office1->pc;
// when $i == 1
// ...
}

Answer 3

foreach( array( $office1, $office2, $o3, $o4) as $o ) {
?>
...
... <?php echo $o->pc;?> ...
<?php
}
Extend the array as needed. Object variables hold a handle refering to the object so this is a cheap operation and not a copy.

Answer 4

First of all store the column output values into an array:
$columns = array($i, $office->pc, $office->pc*$office->pcPowerPerUnit, ...);
you can then output the columns independent to the values in your variables:
echo '<tr><td>', implode('</td><td>', $columns), '</td></tr>';
The only thing left is that you iterate over all those variables you have. Taken an array is much better than using $office1 to $office10:
foreach($offices as $i => $office)
{
$columns = array($i, $office->pc, $office->pc*$office->pcPowerPerUnit, ...);
echo '<tr><td>', implode('</td><td>', $columns), '</td></tr>';
}
Done. However if you don't want to change due to some reason (e.g. not changing too much at once), you can do similar:
foreach(range(1, 10) as $i)
{
$office = ${'office'.$i};
$columns = array($i, $office->pc, $office->pc*$office->pcPowerPerUnit, ...);
echo '<tr><td>', implode('</td><td>', $columns), '</td></tr>';
}