friendica-github/include/cache.php

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<?php
/**
* cache api
*/
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class Cache {
public static function get($key) {
$r = q("SELECT `v` FROM `cache` WHERE `k`='%s' limit 1",
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dbesc($key)
);
if (count($r))
return $r[0]['v'];
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return null;
}
public static function set($key,$value, $duration = CACHE_MONTH) {
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q("REPLACE INTO `cache` (`k`,`v`,`expire_mode`,`updated`) VALUES ('%s','%s',%d,'%s')",
dbesc($key),
dbesc($value),
intval($duration),
dbesc(datetime_convert()));
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}
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/*
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*
* Leaving this legacy code temporaily to see how REPLACE fares
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* as opposed to non-atomic checks when faced with fast moving key duplication.
* As a MySQL extension it isn't portable, but we're not yet very portable.
*/
/*
* $r = q("SELECT * FROM `cache` WHERE `k`='%s' limit 1",
* dbesc($key)
* );
* if(count($r)) {
* q("UPDATE `cache` SET `v` = '%s', `updated = '%s' WHERE `k` = '%s'",
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* dbesc($value),
* dbesc(datetime_convert()),
* dbesc($key));
* }
* else {
* q("INSERT INTO `cache` (`k`,`v`,`updated`) VALUES ('%s','%s','%s')",
* dbesc($key),
* dbesc($value),
* dbesc(datetime_convert()));
* }
* }
*/
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public static function clear(){
q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
dbesc(datetime_convert('UTC','UTC',"now - 30 days")), intval(CACHE_MONTH));
q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
dbesc(datetime_convert('UTC','UTC',"now - 7 days")), intval(CACHE_WEEK));
q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
dbesc(datetime_convert('UTC','UTC',"now - 1 days")), intval(CACHE_DAY));
q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
dbesc(datetime_convert('UTC','UTC',"now - 1 hours")), intval(CACHE_HOUR));
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}
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}