php[world] 2019 — 25 years of PHP

apcu_exists

(PECL apcu >= 4.0.0)

apcu_existsChecks if entry exists

Beschreibung

apcu_exists ( mixed $keys ) : mixed

Checks if one or more APCu entries exist.

Parameter-Liste

keys

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

Rückgabewerte

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.

Beispiele

Beispiel #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);

?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

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

Siehe auch

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