Memcached
PHP Manual

Memcached::prepend

(PECL memcached >= 0.1.0)

Memcached::prepend — Prepend data to an existing item

说明

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

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.

Note:

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.

参数

key

The key of the item to prepend the data to.

value

The string to prepend.

返回值

成功时返回 TRUE， 或者在失败时返回 FALSE. The Memcached::getResultCode() will return Memcached::RES_NOTSTORED if the key does not exist.

范例

Example #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'));
?>

以上例程会输出：

string(6) "defabc"

参见

Memcached
PHP Manual