apcu_add
(PECL apcu >= 4.0.0)
Cache a new variable in the data store
Description
Caches a variable in the data store, only if it's not already stored.
Unlike many other mechanisms in PHP, variables stored using apcu_add() will persist between requests (until the value is removed from the cache).
Parameters
keyStore the variable using this name.
keys are cache-unique, so attempting to useapcu_add()to store data with a key that already exists will not overwrite the existing data, and will instead return false. (This is the only difference betweenapcu_add()andapcu_store().)varThe variable to store
ttlTime To Live; store
varin the cache forttlseconds. After thettlhas passed, the stored variable will be expunged from the cache (on the next request). If nottlis supplied (or if thettlis0), the value will persist until it is removed from the cache manually, or otherwise fails to exist in the cache (clear, restart, etc.).valuesNames in key, variables in value.
Return Values
Returns TRUE if something has effectively been added into the cache, FALSE otherwise. Second syntax returns array with error keys.
Examples
A apcu_add() example
<?php
$bar = 'BAR';
apcu_add('foo', $bar);
var_dump(apcu_fetch('foo'));
echo "\n";
$bar = 'NEVER GETS SET';
apcu_add('foo', $bar);
var_dump(apcu_fetch('foo'));
echo "\n";
?>The above example will output:
string(3) "BAR"
string(3) "BAR"