On 7/27/07, Chris Aitken <chris@xxxxxxxxxxxxxxxx> wrote:
>> header('Cache-Control: no-store, no-cache, must-revalidate,
>> Post-Check=0, Pre-Check=0');
>>
>> brian
>
>That's HTTP/1.1 only, but this is what I got from PHP site:
><?php
>header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
>header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past
>?>
>
But wouldn't that make every image on the page be uncached and reloaded each
time? Not very efficient if the shell of the site keeps getting loaded if
only 1 or 2 images need to be forced.
Regards
Chris Aitken
The Web Hub Designer and Programmer
Phone : 02 4648 0808
Mobile : 0411 132 075
Yes, that depends on which way it is used, I wouldn't recommend
loading images from the database that don't get changed...
And you can of course also use an
if-statement/switch-statement/in_array function in your image.php
script, like this:
$img = $_GET['img'];
if($img == "test_a.jpg" || $img == "test_b.jpg") {
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past
}
OR:
$img = $_GET['img'];
switch($img) {
case "test_a.jpg":
case "test_b.jpg":
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past
}
OR:
$img = $_GET['img'];
$noncached_images = array("test_a.jpg","test_b.jpg");
if(in_array($img,$noncached_images)) {
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past
}
Tijnema
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