(PECL apcu >= 4.0.0)
apcu_exists — Checks if entry exists
keys
A string, or an array of strings, that contain keys.
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.
Example #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);?>
The above example will output something similar to:
Foo exists: apple Baz does not exist array(2) { ["foo"]=> bool(true) ["bar"]=> bool(true) }