Renaming array keys

Posted on 16th Feb 2014 by admin

The issue: renaming array keys inside a foreach loop.

I'm trying to build a pie chart image with the Google Chart API using information from a database. (I'm going to change the type of data I talk about because it is extremely sensitive. Just wanted to share that so you didn't think my example was completely weird or stupid even.)

After running my SELECT statement, I have a 2-column dataset with multiple rows. I am currently grabbing the data in this way:
<?php
$total = 0;
while ($r = mysql_fetch_array($result))
{
$info[$r['month']] = $r['days'];
$total += $r['days'];
}
?>
$info is an array with each key being the name of the month and the value being how many days are in that month. $total is the sum of each days.

To supply the dataset inside the image src, I provide a comma separated list. To supply the labels for each dataset, I provide a list separated by pipes.

The problem that I am having is that I would like each label to be the month as well as a percentage number of the total in parenthesis next to the month name.

I am building the URL perfectly fine using JUST the month name like this:
<?php
echo '<p>';
echo '<img src="http://chart.apis.google.com/chart?cht=p&chd=t:';
echo implode(',',array_values($info));
echo '&chs=250x100&chl=';
echo implode('|',array_keys($info));
echo '" alt="" />';
echo '</p>';
?>(I broke up each line for readability.)

How I am trying to include the percentage in the label is be redefining the key BEFORE I add in the array keys to the URL. Trying by this method:
<?php
foreach ($info as $key => $value)
{
$key = $key . (number_format($value/$total,0)) . '%';
}
?>

Expected outcome:
The labels on the image would read something to the tune of -- June (8.2%)

Actual outcome:
Nothing. Well, not nothing. Just the month is coming out. The key names are not being edited.

Thanks for reading this far. I appreciate the help