Calculate Percent relative to the highest number

[graves_it]

I am looking to show percentages relative to the highest value in the list—so there is always at least one 100% and everything else is a percentage of that maximum value.  How would I go about doing this?

[DarkWater]

<?php
$numbers = array(3, 4, 19, 49, 2, 45, 32);
$outof = max($numbers);
foreach ($numbers as $number) {
    echo "$number: " . (($number / $outof) * 100) . "\n<br />";
}

[graves_it]

What if I wanted to do this for numbers in a mysql table, would I just replace the numbers in the array with the table name? Like...

 

<?php
$numbers = array($tag->count);
$outof = max($numbers);
foreach ($numbers as $number) {
    echo "$number: " . (($number / $outof) * 100) . "\n<br />";
}
?>

 

Didn't seem to work to work for me.

[DarkWater]

Get the array of numbers exactly how you'd normally get an array of numbers from mysql.  You seem to be using some class, so I'm not sure how you do it, but I can tell you right now that you can ditch the array( ) construct around $tag->count;.

[graves_it]

I am a noob to php and just trying to customize something so I am not really sure how to get the array of numbers.  If you could throw some knowledge my way it would be much appreciate.

[DarkWater]

Yeah, umm, I'm not sure what $tag is doing though. @_@  Or how it's storing info.

[graves_it]

$tag  have 4 elements, tag_id, name, slug, count.  Count is the one I am after and it stores the number of tags 0 - the highest number.

[DarkWater]

Okay, but that's a single number, not an array of numbers, right...?

[graves_it]

Each entry into the database is a single number, meaning 0 - ∞

[graves_it]

Maybe this will help, here is the section of the file I am working on.  I want to enter the percentage just before the % sign.

<h3>Popular Tags</h3>
    <ul class="chartlist">
    	<?php foreach($popular_tags as $tag): ?>
    	<li><a href="<?php echo $this->config->item('base_url')?>items/tag/<?php echo $tag->slug?>"> <span class="label"><?php echo $tag->name?></span></a><span class="index" style="width: %"></span></li>
    	<?php endforeach; ?>
    </ul>

 

 

[DarkWater]

Ohhh, that makes a lot more sense then.  Try something like:

 

<h3>Popular Tags</h3>
    <ul class="chartlist">
        <?php foreach ($popular_tags as $tag) {
                     $totals[] = $tag->count;
           }
           $outof = max($totals);
    	<?php foreach($popular_tags as $tag): ?>
    	<li><a href="<?php echo $this->config->item('base_url')?>items/tag/<?php echo $tag->slug?>"> <span class="label"><?php echo $tag->name?></span></a><span class="index" style="width: <?php echo ($tag->count / outof) * 100; ?>%"></span></li>
    	<?php endforeach; ?>
    </ul>

 

Try that while I think of a more efficient way of doing it. >_<

[graves_it]

This does not seem to work, throws a syntax error.

[DarkWater]

Yeah, woops, forgot a ?>.

 

<h3>Popular Tags</h3>
    <ul class="chartlist">
        <?php foreach ($popular_tags as $tag) {
                     $totals[] = $tag->count;
           }
           $outof = max($totals);
        ?>
    	<?php foreach($popular_tags as $tag): ?>
    	<li><a href="<?php echo $this->config->item('base_url')?>items/tag/<?php echo $tag->slug?>"> <span class="label"><?php echo $tag->name?></span></a><span class="index" style="width: <?php echo ($tag->count / outof) * 100; ?>%"></span></li>
    	<?php endforeach; ?>
    </ul>

 

In the future, please tell me what the syntax error is instead of just saying that there is one. >_>  I knew what it was thing time, luckily.

[graves_it]

The first one worked and then I get the error

A PHP Error was encountered

Severity: Warning

Message: Division by zero

[DarkWater]

Grr, another tiny error:

 

<h3>Popular Tags</h3>
    <ul class="chartlist">
        <?php foreach ($popular_tags as $tag) {
                     $totals[] = $tag->count;
           }
           $outof = max($totals);
        ?>
    	<?php foreach($popular_tags as $tag): ?>
    	<li><a href="<?php echo $this->config->item('base_url')?>items/tag/<?php echo $tag->slug?>"> <span class="label"><?php echo $tag->name?></span></a><span class="index" style="width: <?php echo ($tag->count / $outof) * 100; ?>%"></span></li>
    	<?php endforeach; ?>
    </ul>

 

Lol, try that one.

[graves_it]

BINGO!!!  Thank you so much!!