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Update a script based on time elapsed?

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May 18.2009

Hi there im writing a text based game along the lines of mafia wars (facebook) and want a users stamina to increase every 5 minutes and am wondering how i would go about doing tht and what would be the best way to implement such a system?

this is the one thing i’m really struggling with, the stamina will be saved in the users table along side their user id and i want the stamina to continue to increase whether they are in a current session or not.

Any ideas? Thanks in advance ?

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PHP

2 Comments(s) ↴

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@MindzaiMay 18.2009 — If the stamina is to increase constantly, you should just need to save the last time the stamina was updated in your table. If you know the current stamina for a user, the time that stamina was set, and the amount of stamina per 5 mins it's a pretty easy formula.

I would reccomend storing the time as a unix timestamp for easy calculations.

[code=php]
$stamina_per_fivemins = 10;
$current_stamina = 100; // this would come from a SELECT query
$stamina_updated = 1242663179; // also from the database
$seconds_elapsed = time() - stamina_updated;

$new_stamina = round(($seconds_elapsed / 300) * $stamina_per_fivemins);
[/code]

Obviously in reality you would probably make this into a function and compact down some of the code:

[code=php]
function calculate_stamina($current, $last_updated) {
return round(((time() - $last_updated) / 300) * 10);
}
[/code]
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@ToffeeCrispauthorMay 18.2009 — thanks for your reply Mindzai I will definitely do that and see how it goes, cheers for the help!
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