CascadiaPHP 2024


(PECL apcu >= 4.0.0)

apcu_store Cache a variable in the data store


apcu_store(string $key, mixed $var, int $ttl = 0): bool
apcu_store(array $values, mixed $unused = NULL, int $ttl = 0): array

Cache a variable in the data store.

Note: Unlike many other mechanisms in PHP, variables stored using apcu_store() will persist between requests (until the value is removed from the cache).



Store the variable using this name. keys are cache-unique, so storing a second value with the same key will overwrite the original value.


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.

Return Values

Returns true on success or false on failure. Second syntax returns array with error keys.


Example #1 A apcu_store() example

= 'BAR';
apcu_store('foo', $bar);

The above example will output:

string(3) "BAR"

See Also

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User Contributed Notes 1 note

info at qmegas dot info
3 years ago
Be careful when updating same key with ttl set during same request. For example:
for ($i = 0; $i < 20; $i++) {
apcu_store('test', $i, 10);

After 10 seconds the key will become not available and won't be updated. Tested on Windows and Linux platforms. Not sure if it's a bug or undocumented behavior.
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