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apcu_exists

(PECL apcu >= 4.0.0)

apcu_exists — Checks if entry exists

Descrizione

apcu_exists(string|array $keys): bool|array

Checks if one or more APCu entries exist.

Elenco dei parametri

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

Valori restituiti

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.

Esempi

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);

?>

Il precedente esempio visualizzerà qualcosa simile a:

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

Vedere anche: