CODEWITHSUNDEEP
phpcaching
Guy in the chair
Guy in the chair

Reputation: 1065

Is there anyway I can get the time of cached file?

A very simple question, I need time when a file was cached on client's computer.

I want to reload page from server if it's modified after the time of cached file.

Is it possible? I'm completely unaware about this. Any help will be appreciated.

Upvotes: 0

Views: 41

Answers (1)

Steve
Steve

Reputation: 20469

You could embed a timestamp into the html somewhere:

<body data-generated="<?php echo time();?>">

Then check this against server updated time, via an ajax request:

//jquery for berevity

$.get('invalidate_client_cache.php?time='+ $('body').data('generated'), function(data){
    if(data.invalidate){
        location.reload(true);
    }
}

I will leave the php implenentation to you, as i dont know yout requirements, but it could be something like:

$clientCacheTime = isset($_GET['time'])? $_GET['time'] : null;
$data=[];
$data['invalidate'] = reloadRequired($clientCacheTime);
header('Content-Type: application/json');
echo json_encode($data);

Upvotes: 1

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