Explode DB record into tabular format - php

Question

I have a database connected to my site that is recording actions taken by a user on an application we have built. The application holds a number of images, which the user can view and download, and the application tracks, per user, which image they have viewed delimited by a comma
What I want to do is write a PHP script that will allow me to turn this delimited text string into a calculated table format
If the database has example records of:
1 | 1-A, 1-B, 2-A, 2-C
2 | 1-A
3 | 1-B, 2-C
4 |
5 | 1-A, 1-B, 1-C, 2-A
To which I wanted to write a script that would be able to output this as:
1-A = 3
1-B = 3
1-C = 1
2-A = 2
2-C = 2
(I want to point out, I'm not suggesting that I want to have variables named after each entry, with its calculated total as the value, I'm open to however is best to return this value)
My first step was to explode each record into an array, but then I wasn't sure as to my next step to turn this into something I can write into a table.
I realise the database is very poorly structured, but unfortunately I haven't written it, and so I have no ability to re-structure the data is stored.
Kind regards

Answer 1

this should work:
<?php
$values = array (
'1' => '1-A, 1-B, 2-A, 2-C',
'2' => '1-A',
'3' => '1-B, 2-C',
'4' => '',
'5' => '1-A, 1-B, 1-C, 2-A'
);
$valueCounts = array();
foreach($values as $value)
{
foreach(explode(', ', $value) as $val)
{
if(!key_exists($val, $valueCounts))
{
if($val) $valueCounts[$val] = 1;
}
else
{
$valueCounts[$val]++;
}
}
}
ksort($valueCounts);
foreach($valueCounts as $value => $count)
{
echo "$value = $count<br />";
}
?>
result:
1-A = 3
1-B = 3
1-C = 1
2-A = 2
2-C = 2
if you're not sure how to populate the $values array, please paste the database code and I will try and incorporate it into the above.