apcu_store

(PECL apcu >= 4.0.0)

apcu_store — Cache a variable in the data store

说明

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).

参数

key: Store the variable using this name. keys are cache-unique, so storing a second value with the same key will overwrite the original value.
var: The variable to store
ttl: 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.).
values: Names in key, variables in value.

返回值

成功时返回 true，或者在失败时返回 false。 Second syntax returns array with error keys.

范例

Example #1 A apcu_store() example


<?php
$bar = 'BAR';
apcu_store('foo', $bar);
var_dump(apcu_fetch('foo'));
?>

以上例程会输出：

string(3) "BAR"

参见

apcu_add() - Cache a new variable in the data store
apcu_fetch() - Fetch a stored variable from the cache
apcu_delete() - Removes a stored variable from the cache

User Contributed Notes

info at qmegas dot info 11-Mar-2021 01:34


Be careful when updating same key with ttl set during same request. For example:

<?php

for ($i = 0; $i < 20; $i++) {

    apcu_store('test', $i, 10);

    sleep(1);

}

?>



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.