Memcached::prepend

(PECL memcached >= 0.1.0)

Memcached::prepend — Prepend data to an existing item

Beschreibung

public Memcached::prepend(string $key, string $value): ?bool

Memcached::prepend() prepends the given value string to the value of an existing item. The reason that value is forced to be a string is that prepending mixed types is not well-defined.

Hinweis:
If the Memcached::OPT_COMPRESSION is enabled, the operation will fail and a warning will be issued, because prepending compressed data to a value that is potentially already compressed is not possible.

Parameter-Liste

key: The key of the item to prepend the data to.
value: The string to prepend.

Rückgabewerte

Gibt bei Erfolg true zurück. Bei einem Fehler wird false zurückgegeben. Returns null when compression is on.

Fehler/Exceptions

Returns null and raises an E_WARNING when compression is enabled.

Beispiele

Beispiel #1 Memcached::prepend() example

<?php
$m = new Memcached();
$m->addServer('localhost', 11211);
$m->setOption(Memcached::OPT_COMPRESSION, false);

$m->set('foo', 'abc');
$m->prepend('foo', 'def');
var_dump($m->get('foo'));
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

string(6) "defabc"

Siehe auch

Memcached::prependByKey() - Prepend data to an existing item on a specific server
Memcached::append() - Append data to an existing item

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