apcu_exists

(PECL apcu >= 4.0.0)

apcu_existsChecks if entry exists

설명

mixed apcu_exists ( mixed $keys )

Checks if one or more APCu entries 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 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);

?>

위 예제의 출력 예시:

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

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