Switch(Change) between two images on hitting refresh

I have a webpage and in that I want to change between two images on refreshing. I don't want to use random function because it will only produce a random output like, I may get the first image correctly, but the second image might be show after 8 or 9开发者_如何学Go refresh attempts. So using random function is not possible.

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You can store the current image been displayed in a session variable:

session_start();

$total_images = 10; // or whatever is the total number of images u have

if (!isset($_SESSION['current'])){
   $_SESSION['current'] = 1;
   $current = 1;
}else {
   $current = $_SESSION['current'];
   $_SESSION['current']++;
}

if ($_SESSION['current'] > $total_images) {
   $_SESSION['current'] = 1; // this way it will start over it reaches the end
}

$image = "image/path/name{$current}.jpg"; // name1.jpg, name2.jpg ... and so on;

// now echo the current image
echo "<img src={$image} alt='' />";

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Sweet, simple and easy.

session_start();
$swap = 8; // or 9, depends on you
if (!isset($_SESSION['count'])) $_SESSION['count'] = 1;
else {
     $_SESSION['count']++;
     if ($_SESSION['count'] < $swap) echo '<img src="image1.jpg" />';
     else {
        echo '<img src="image2.jpg" />';
        unset($_SESSION['count']);
     }
}