apc_exists

(PECL apc >= 3.1.4)

apc_exists — Checks if APC key exists

설명

mixed apc_exists ( mixed $keys )

Checks if one or more APC keys exist.

인수

keys: A string, or an array of strings, that contain keys.

반환값

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.

예제

Example #1 apc_exists() example


<?php
$fruit  = 'apple';
$veggie = 'carrot';

apc_store('foo', $fruit);
apc_store('bar', $veggie);

if (apc_exists('foo')) {
    echo "Foo exists: ";
    echo apc_fetch('foo');
} else {
    echo "Foo does not exist";
}

echo PHP_EOL;
if (apc_exists('baz')) {
    echo "Baz exists.";
} else {
    echo "Baz does not exist";
}

echo PHP_EOL;

$ret = apc_exists(array('foo', 'donotexist', 'bar'));
var_dump($ret);

?>

위 예제의 출력 예시:

Foo exists: apple
Baz does not exist
array(2) {
  ["foo"]=>
  bool(true)
  ["bar"]=>
  bool(true)
}

참고

apc_cache_info() - Retrieves cached information from APC's data store
apc_fetch() - Fetch a stored variable from the cache