display random image on each new session? - php

Question

I am trying to make it so that each time a user session is loaded a random image is displayed from the directory. Like an advert.
At the moment the image changes each page refresh, this doesn't really help me because as a user goes from page to page the constant refresh of images becomes annoying.
Here's what I have so far?
Please can anyone point out the piece of code I need to do what I need to do.
<?php
$path_to_images = "../PTB1/data/adverts/"; // path for images
$default_img = "test.png"; // default image, when error on page
function getRandomImage($path, $img) {
if ( $list = getImagesList($path) ) {
mt_srand( (double)microtime() * 1000000 );
$num = array_rand($list);
$img = $list[$num];
}
return $path . $img;
}
function getImagesList($path) {
$ctr = 0;
if(!isset($_SESSION['id']));
if ( $img_dir = #opendir($path) ) {
while ( false !== ($img_file = readdir($img_dir)) ) {
// formati slik, ki jih prepozna
if ( preg_match("/(\.gif|\.jpg|\.png)$/", $img_file) ) {
$images[$ctr] = $img_file;
$ctr++;
}
}
closedir($img_dir);
return $images;
}
return false;
}
?>
<div class=\"advert-box\" id=\"mod-advert\">
<img src="<?php echo getRandomImage($path_to_images, $default_img) ?>" height="190" width="180"alt="">
</div>

Answer 1

Did you try creating a session variable?
<?php
session_start();
// check if a image is already present
// no need to create again
if(!isset($_session['image'])){
$_session['image'] = getRandomImage($path_to_images, $default_img);
}
....
....
<div class=\"advert-box\" id=\"mod-advert\">
<img src="<?php echo $_session['image'] ?>" height="190" width="180"alt="">
</div>

Answer 2

first step, do the image selection when user LOGIN:
session_start();
if(!isset($_SESSION['image'])){
$_SESSION['image'] = getRandomImage($path_to_images, $default_img);
}
next, on every page, you just have to look at the $_SESSION['image'] variable:
<img src="<?php echo $_SESSION['image']; ?>" height="190" width="180"alt="">