apcu_exists
(PECL apcu >= 4.0.0)
apcu_exists — Checks if entry exists
參數
-
keys -
A string, or an array of strings, that contain keys.
返回值
Returns true if the key exists, otherwise false Or if an
array was passed to keys, then
an array is returned that contains all existing keys, or an empty
array if none exist.
範例
示例 #1 apcu_exists() example
<?php
$fruit = 'apple';
$veggie = 'carrot';
apcu_store('foo', $fruit);
apcu_store('bar', $veggie);
if (apcu_exists('foo')) {
echo "Foo exists: ";
echo apcu_fetch('foo');
} else {
echo "Foo does not exist";
}
echo PHP_EOL;
if (apcu_exists('baz')) {
echo "Baz exists.";
} else {
echo "Baz does not exist";
}
echo PHP_EOL;
$ret = apcu_exists(array('foo', 'donotexist', 'bar'));
var_dump($ret);
?>
以上例程的輸出類似於：
Foo exists: apple
Baz does not exist
array(2) {
["foo"]=>
bool(true)
["bar"]=>
bool(true)
}
參見
- apcu_cache_info() - 從 APCu 儲存中獲取快取資訊
- apcu_fetch() - Fetch a stored variable from the cache