return the closest numbers

[joecooper]

i have a list of resolutions, and i want the code to be able to find which one is the closest.

 

example of what im looking for:

$resolution could equal any 2 numbers in ####x#### format

eg 800x640, and the code needs to be able to choose which one is closest to that, so should return: 1024x768

 

the list i have is:

1920x1200

1680x1050

1440x900

1280x800

 

1600x1200

1280x960

1024x768

 

1280x1024

 

 

[lemmin]

Keep an array of the possible values to compare to and have them be in order. Then, when you get the value to test, iterate through the list comparing it to each one. Stop when you find one that is bigger (or smaller if you order it the other way.)

[joecooper]

but its using 2 numbers that i dont know how to check them both

[Barand]

try

<?php
function closest ($res)
{
    $res_array = array (
                '1920x1200',
                '1680x1050',
                '1440x900' ,
                '1280x800' ,
                '1600x1200',
                '1280x960' ,
                '1024x768' ,
                '1280x1024'
            );
            
    $diff = 9999;
    $result = '';
    list ($w, $h) = explode ('x', $res);
    foreach ($res_array as $str)
    {
        list ($w2, $h2) = explode ('x', $str);
        $d = abs($w2-$w) + abs($h2-$h);
        if ($d < $diff)
        {
            $result = $str;
            $diff = $d;
        }
    }
    return $result;        
}

echo closest('800x640');
?>

[joecooper]

Hi thanks for that code,

 

the size i put thought it is 1680x1050, but it only seems to return the 1024x768

[joecooper]

<?php

session_start();

require('db.php');

 

 

 

function closest ($res)

{

    $res_array = array (

                '1920x1200',

                '1680x1050',

                '1440x900' ,

                '1280x800' ,

                '1600x1200',

                '1280x960' ,

                '1024x768' ,

                '1280x1024'

            );

           

    $diff = 9999;

    $result = '';

    list ($w, $h) = explode ('x', $res);

    foreach ($res_array as $str)

    {

        list ($w2, $h2) = explode ('x', $str);

        $d = abs($w2-$w) + abs($h2-$h);

        if ($d < $diff)

        {

            $result = $str;

            $diff = $d;

        }

    }

    return $result;       

}

 

$resolution=($_GET['rez']);

$resolution=closest('$resolution');

die($resolution);

?>

 

this always seems to return 1024x768 when i access the URL with http://joeyjoe.co.uk/wallpaper/getpaper.php?how=random&rez=1680x1050

[Barand]

$resolution=closest('$resolution');

 

Dont put single quotes around $resoultion - passes the literal "$resolution" instead of it's contents.

[joecooper]

ah! its always something so simple i miss it