CODEWITHSUNDEEP
phpimage
Nate
Nate

Reputation: 6474

Create 5 different random images in PHP

I have the following code in a php file to create a random image using php:

header("Content-type: image/png");
$my_img = imagecreate(rand(200,400), rand(50,100));
$background = imagecolorallocate($my_img, 0, 0, rand(1, 255));
$text_colour = imagecolorallocate($my_img, rand(1, 255), rand(1, 255), 0);
$line_colour = imagecolorallocate($my_img, rand(1, 255), rand(1, 255), 0);
imagestring($my_img, 4, 30, 25, "Random Text Here", $text_colour );
imagesetthickness ( $my_img, 5 );
imagepng($my_img);
imagecolordeallocate($line_color);
imagecolordeallocate($text_color);
imagecolordeallocate($background);
imagedestroy($my_img);

I add the image using an html file like this:

<img src="myphpfile.php">

If I do that more than once:

<img src="myphpfile.php">
<img src="myphpfile.php">
<img src="myphpfile.php">
<img src="myphpfile.php">
<img src="myphpfile.php">

it generates the same image 5 times. How can I use the php file to display a different image?

Upvotes: 2

Views: 80

Answers (2)

accurate respondetur
accurate respondetur

Reputation: 702

The image is being cached. Add no cache headers:

header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0"); header("Cache-Control: post-check=0, pre-check=0", false); header("Pragma: no-cache");

Upvotes: 2

Samuel
Samuel

Reputation: 17171

Try adding a random query string to prevent the browser from thinking it's the same image and caching it.

<img src="myphpfile.php?1">
<img src="myphpfile.php?2">
<img src="myphpfile.php?3">
<img src="myphpfile.php?4">
<img src="myphpfile.php?5">

Upvotes: 2

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