Renaming array keys

Posted on 16th Feb 2014 07:03 pm 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

Your Answer:

Login to answer

Other forums

Please help with SMTP Authenticated PHP Email Form
Hello, I'm creating a PHP email form, and for this particular server, I have to use SMTP Authenticat

help understanding hidden input w/ php
hello i'm doing a tutorial where there are multiple forms for an edit page for a user to update thei

Rss feed question
Hi

My blog and my website are different. Am i able to take my rss feed
from my blog and p

Ajax Issues - Update Panel / Timer. Intellisense doesn't know about them
Type 'System.Web.UI.ScriptManager' does not have a public property named 'UpdatePanel'. That is wha

Fatal error: Call to a member function fetchrow() on a non-object in C:xamppht
okay i have this query and everytime i add `item_id`=? to it... it gives me the error in the title..

Paypal
Hi all,

I have an advanced basic knowledge of php

I want to try something new for a s

Pls help with PHP
Pls can anyone direct me on how to create a user account for a customer. For example i want know if

SCO Unix
I know this might not be the place to ask, but, can anyone tell me if SCO Unix comes with PHP built

DataTable Help Required
Hi all I am creating an app that utilises and MS Access back end and queries it quite a bit at vario

Running External Scripts
I am very new to PHP and am not even sure what I'm asking is possible. I have just installed mediaW