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Comparing values from a while loop....

Posted on 2011-09-02
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Last Modified: 2012-06-21
So i have a while loop which does math on several records.

After i have completed math on each record, how can i store each value to sort highest to lowest after the while loop has completed?
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Question by:blink10
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9 Comments
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 36476184
Put the values into an array, and you can sort them later.
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 36476186
Check this link for the ways that PHP can sort arrays of information:
http://us3.php.net/manual/en/array.sorting.php
0
 
LVL 10

Expert Comment

by:Ultrus
ID: 36476234
Try something like this:

<?php
$magicNumber = 1;
$someNums = array(22,45,24,67);
$combinedArray = array();
$resultArray = array();

foreach($someNums as $someNum) {
  $result = $someNum + $magicNumber;
  $resultArray[] = $result;
  $combinedArray[] = array('result' => $result, 'origNum' => $someNum);
}

array_multisort($resultArray, SORT_DESC, $combinedArray);

print 'Drum roll please... ' . $combinedArray[0]['result'] . ' with an original number of ' . $combinedArray[0]['origNum'];

print '<pre>';
print_r($combinedArray);
print '</pre>';
?>

Open in new window


Let me know if that helps inspire something. :)

Best regards,

Chris
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Author Comment

by:blink10
ID: 36476242
Chris thanks for the solution, but I think I am very close to what i need with my code i wrote since i posted 20 minute ago.


One last problem i am having, i am creating an associate array, sorting it fine, but how can i make it so that i can just choose the lowest value without knowing the corresponding key.

In other words, i just need to lowest variable to do more math with, how can i just select it?
0
 
LVL 10

Expert Comment

by:Ultrus
ID: 36476253
Since you sorted it Descending (highest value first), try this:

<?php
print $myValues[count($myValues) - 1];
?>

Open in new window


That gives the last index.
0
 

Author Comment

by:blink10
ID: 36476274
No luck....

I used:
            foreach ($allcoupons as $key => $val) {
                 echo "$key = $val\n";
                  }

To determine my array after sorting, the above produced:
Round1 = 23.2 Round2 = 28.2744 Round3 = 38.88

Then I wrote:

            echo "<b>Best Price: </b>";
            
            print $allcoupons[count($allcoupons) - 1];

And got nothing, thoughts?
0
 
LVL 10

Accepted Solution

by:
Ultrus earned 1000 total points
ID: 36476286
Ahhh. Your keys are not numeric. That's why.

Try

<?php
print end($allcoupons);
?>

Open in new window


(never tried it before)
0
 
LVL 111

Assisted Solution

by:Ray Paseur
Ray Paseur earned 1000 total points
ID: 36476314
Please read this over carefully.  If you do not know 100% what any of the functions accomplish, look them up on PHP.net and read the descriptions, inputs, outputs (return values) and user-contributed notes.  Then post back with any questions.
http://www.laprbass.com/RAY_temp_blink10.php

You might also want to get this book and give yourself a little time to work through it.  Very readable with great examples.
http://www.sitepoint.com/books/phpmysql4/

Best of luck with your project, ~Ray
<?php // RAY_temp_blink10.php
error_reporting(E_ALL);
echo "<pre>";

// FROM THE POST AT EE
// Round1 = 23.2 Round2 = 28.2744 Round3 = 38.88

// CREATE SOME SIMULATED TEST DATA
$arr = array
( 'Round1' => 23.2
, 'Round2' => 28.2744
, 'Round3' => 38.88
)
;

// SHOW THE SIMULATED TEST DATA
var_dump($arr);

// ORDER IT IN A RANDOM MANNER
shuffle($arr);

// SHOW THE SHUFFLED DATA
var_dump($arr);

// SORT BY VALUES DESCENDING
arsort($arr);
reset($arr);

// SHOW THE LARGEST VALUE IN THE ARRAY
var_dump(current($arr));

Open in new window

0
 

Author Closing Comment

by:blink10
ID: 36477049
thanks for the help
0

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