$values
[, mixed $unused
= NULL [, int $ttl
= 0 ]] )Caches a variable in the data store, only if it's not already stored.
Note: Unlike many other mechanisms in PHP, variables stored using apcu_add() will persist between requests (until the value is removed from the cache).
Store the variable using this name. key
s are cache-unique, so attempting to use apcu_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 between apcu_add() and apcu_store().)
The variable to store
Time To Live; store var
in the cache for ttl
seconds. After the ttl
has passed, the stored variable will be expunged from the cache (on the next request). If no ttl
is supplied (or if the ttl
is 0), the value will persist until it is removed from the cache manually, or otherwise fails to exist in the cache (clear, restart, etc.).
Names in key, variables in value.
Returns TRUE if something has effectively been added into the cache, FALSE otherwise. Second syntax returns array with error keys.
<?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"
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