apcu_entry

(PECL apcu >= 5.1.0)

apcu_entry — Atomically fetch or generate a cache entry

说明

apcu_entry(string $key, callable $callback, int $ttl = 0): mixed

Atomically attempts to find key in the cache, if it cannot be found callback is called, passing key as the only argument. The return value of the call is then cached with the optionally specified ttl, and returned.

注意: When control enters apcu_entry() the lock for the cache is acquired exclusively, it is released when control leaves apcu_entry(): In effect, this turns the body of callback into a critical section, disallowing two processes from executing the same code paths concurrently. In addition, it prohibits the concurrent execution of any other APCu functions, since they will acquire the same lock.

警告

The only APCu function that can be called safely by callback is apcu_entry().

参数

key

Identity of cache entry

callback

A callable that accepts key as the only argument and returns the value to cache.

ttl

Time To Live; store the callback's return value in the cache for ttl seconds. After the ttl has passed, the stored entry 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.).

返回值

Returns the cached value

示例

示例 #1 An apcu_entry() example

<?php
$config = apcu_entry("config", function($key) {
return [
"fruit" => apcu_entry("config.fruit", function($key){
return [
"apples",
"pears"
];
}),
"people" => apcu_entry("config.people", function($key){
return [
"bob",
"joe",
"niki"
];
})
];
});

var_dump($config);
?>

以上示例会输出：

array(2) {
  ["fruit"]=>
  array(2) {
    [0]=>
    string(6) "apples"
    [1]=>
    string(5) "pears"
  }
  ["people"]=>
  array(3) {
    [0]=>
    string(3) "bob"
    [1]=>
    string(3) "joe"
    [2]=>
    string(4) "niki"
  }
}

参见