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chose random images for a banner

Posted on 2011-09-12
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Last Modified: 2012-05-12

want to chose random images for a banner  with no duplicate images



function chose(image inventory, number of images to pack in return array){}


$images = array('1.gif', '2.gif', '3.jpg', '4.jpg', '5.gif', '6.jpg', '7.jpg', '8.gif');
$imageSet = chose($images, 4);
echo $imageSet
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Question by:rgb192
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6 Comments
 
LVL 16

Expert Comment

by:santoshmotwani
ID: 36527458
0
 
LVL 8

Accepted Solution

by:
kivan24 earned 2000 total points
ID: 36527846
try this:
function chose($img_arr, $img_num) {
    $rand_img = array();
    $img_array_len = count($img_arr);
    for ($i=0; $i<$img_num; $i++) {
        $randindex = rand(0, $img_array_len-1);
        if (!in_array($img_arr[$randindex], $rand_img)) {
            $rand_img[] = $img_arr[$randindex];
        } else {
            $i--;
        }
    }
    return $rand_img;
}


$images = array('1.gif', '2.gif', '3.jpg', '4.jpg', '5.gif', '6.jpg', '7.jpg', '8.gif');
$imageSet = chose($images, 4);
print_r ($imageSet);

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LVL 111

Expert Comment

by:Ray Paseur
ID: 36528541
0
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LVL 111

Expert Comment

by:Ray Paseur
ID: 36528576
Refresh this screen a few times...
http://www.laprbass.com/RAY_temp_rgb192.php

If you have the risk of duplicates in the original $images array, you can use
http://us.php.net/manual/en/function.array-unique.php

Best regards, ~Ray
<?php // RAY_temp_rgb192.php
error_reporting(E_ALL);

// TEST DATA
$images = array('1.gif', '2.gif', '3.jpg', '4.jpg', '5.gif', '6.jpg', '7.jpg', '8.gif');

// GET FOUR AT RANDOM
shuffle($images);
$chosen = array_slice($images , 0, 4);

// SHOW THE WORK PRODUCT
print_r($chosen);

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0
 

Author Closing Comment

by:rgb192
ID: 36554451
this handles duplicates.
thanks
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 36554500
Your choice, of course, but I think I would rather use two statements instead of thirteen.
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