Cross referenced tables from multi-dimensional arrays php? - php

Question

How do it turn a multidimensional array like:
$fruits['apples']['blue'] = 24;
$fruits['bananas']['blue'] = 12;
$fruits['apple']['red'] = 34;
$fruits['gooseberries']['orange'] = 4;
$fruits['oranges']['red'] = 12;
into a cross referenced table like:
alt text http://1updesign.org/uploads/p24.png

Answer 1

$cols = array('blue', 'red', 'orange');
echo '<table>';
echo '<thead><tr><td></td><th scope="col">' . implode('</th><th scope="col">', $cols) . '</th></tr></thead>';
echo '<tbody>';
foreach($fruits as $label => $row)
{
echo '<tr>';
echo '<th scope="row">' . $label . '</th>';
foreach($cols as $k)
{
echo '<td>' . (isset($row[$k]) ? $row[$k] : 0) . '</td>';
}
echo '</tr>';
}
echo '</tbody>';
echo '</table>';
You’ll want some HTML escaping and such, but that’s the gist of it.

Answer 2

Your array is bad designed. How should one know, that apples is the same as apple. Your array should be constructed this way:
$fruits['apples']['blue'] = 24;
$fruits['apples']['read'] = 24;
$fruits['bananas']['blue'] = 12;
$fruits['gooseberries']['orange'] = 4;
$fruits['oranges']['red'] = 12;
Then iterating is easy. The first level of the array are the rows. So:
<?php
$column_head = array();
foreach($fruits as $key => $value) {
$column_head = array_merge($column_head, array_keys($value));
}
$column_head = array_unique($column_head);
print_r($column_head);
?>
<table>
<tr>
<th></th>
<?php foreach($column_head as $head): ?>
<th><?php echo $head; ?></th>
<?php endforeach; ?>
</tr>
<?php foreach($fruits as $fruit => $amount): ?>
<tr>
<td><?php echo $fruit ?></td>
<?php foreach($column_head as $head): ?>
<td><?php echo isset($amount[$head]) ? $amount[$head] : 0 ?></td>
<?php endforeach; ?>
</tr>
<?php endforeach; ?>
</table>
This generates which columns to use on fly, but it can be hardcoded which might be easier. As the code uses a lot loops it might be not that efficient...