apcu_exists

(PECL apcu >= 4.0.0)

apcu_existsChecks if entry exists

Опис

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

Checks if one or more APCu entries exist.

Параметри

keys

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

Значення, що повертаються

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.

Приклади

Приклад #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);

?>

Поданий вище приклад виведе щось схоже на:

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

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