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    Memcached::getAllKeys

    (PECL memcached >= 2.0.0)

    Memcached::getAllKeys — すべてのサーバーのキーを取得する

    説明

    public Memcached::getAllKeys(): array|false

    Memcached::getAllKeys() は、 個々の memcache サーバーに問い合わせて、その時点で格納されているすべてのキーの配列を取得します。 これはアトミックな操作ではないので、ある時点でのすべてのキーのスナップショットを真の意味で取得したとは言えません。 また、memcache はすべてのキーを返すことを保証しないので、 すべてのキーを取得したものとみなすこともできません。

    注意:

    このメソッドはデバッグ目的に使うものです。 よって、大規模な運用環境で使うべきではありません。

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    成功した場合は全サーバーに格納されているキー、失敗した場合に false を返します。

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    User Contributed Notes 4 notes

    up
    6
    flaviu dot chelaru at gmail dot com
    7 years ago
    // initiate the memcached instance
    $cache = new \Memcached();
    $cache->addServer('localhost', '11211');

    // get all stored memcached items

    $keys = $cache->getAllKeys();
    $cache->getDelayed($keys);

    $store = $cache->fetchAll();

    // delete by regex keys

    $keys = $cache->getAllKeys();
    $regex = 'product_.*';
    foreach($keys as $item) {
    if(preg_match('/'.$regex.'/', $item)) {
    $cache->delete($item);
    }
    }
    up
    3
    xiangku7890 at gmail dot com
    8 years ago
    First I use the lastest memcached version 1.4.25, but unfortunately I found memcached::getAllkeys do not work with it, though i follow the others suggestion to disable Memcached::OPT_BINARY_PROTOCOL. So i try to use history versions, when i use memcached version 1.4.17, it works.
    up
    1
    danb1974 at gmail dot com
    4 years ago
    The right way to dump slab keys seems to be by using lru_crawler metadump instead of stats cachedump, see https://github.com/memcached/memcached/issues/405

    <?php

    function getAllKeys(string $host, int $port): array
    {
    $sock = fsockopen($host, $port, $errno, $errstr);
    if (    $sock === false) {
    throw new     Exception("Error connection to server {$host} on port {$port}: ({$errno}) {$errstr}");
    }

    if (    fwrite($sock, "stats items\n") === false) {
    throw new     Exception("Error writing to socket");
    }

    $slabCounts = [];
    while ((    $line = fgets($sock)) !== false) {
    $line = trim($line);
    if (    $line === 'END') {
    break;
    }

    // STAT items:8:number 3
    if (preg_match('!^STAT items:(\d+):number (\d+)$!', $line, $matches)) {
    $slabCounts[$matches[1]] = (int)$matches[2];
    }
    }

    foreach (    $slabCounts as $slabNr => $slabCount) {
    if (    fwrite($sock, "lru_crawler metadump {$slabNr}\n") === false) {
    throw new     Exception('Error writing to socket');
    }

    $count = 0;
    while ((    $line = fgets($sock)) !== false) {
    $line = trim($line);
    if (    $line === 'END') {
    break;
    }

    // key=foobar exp=1596440293 la=1596439293 cas=8492 fetch=no cls=24 size=14908
    if (preg_match('!^key=(\S+)!', $line, $matches)) {
    $allKeys[] = $matches[1];
    $count++;
    }
    }

    // if ($count !== $slabCount) {
    // throw new Exception("Surprise, got {$count} keys instead of {$slabCount} keys");
    // }
    }

    if (    fclose($sock) === false) {
    throw new     Exception('Error closing socket');
    }

    return     $allKeys;
    }
    up
    1
    harold at snel dot me
    5 years ago
    /**
    * Get all memcached keys. Special function because getAllKeys() is broken since memcached 1.4.23. Should only be needed on php 5.6
    *
    * cleaned up version of code found on Stackoverflow.com by Maduka Jayalath
    *
    * @return array|int - all retrieved keys (or negative number on error)
    */
    public function getMemcachedKeys($host = '127.0.0.1', $port = 11211)
    {
    $mem = @fsockopen($host, $port);
    if ($mem === false)
    {
    return -1;
    }

    // retrieve distinct slab
    $r = @fwrite($mem, 'stats items' . chr(10));
    if ($r === false)
    {
    return -2;
    }

    $slab = [];
    while (($l = @fgets($mem, 1024)) !== false)
    {
    // finished?
    $l = trim($l);
    if ($l == 'END')
    {
    break;
    }

    $m = [];
    // <STAT items:22:evicted_nonzero 0>
    $r = preg_match('/^STAT\sitems\:(\d+)\:/', $l, $m);
    if ($r != 1)
    {
    return -3;
    }
    $a_slab = $m[1];

    if (!array_key_exists($a_slab, $slab))
    {
    $slab[$a_slab] = [];
    }
    }

    reset($slab);
    foreach ($slab as $a_slab_key => &$a_slab)
    {
    $r = @fwrite($mem, 'stats cachedump ' . $a_slab_key . ' 100' . chr(10));
    if ($r === false)
    {
    return -4;
    }

    while (($l = @fgets($mem, 1024)) !== false)
    {
    // finished?
    $l = trim($l);
    if ($l == 'END')
    {
    break;
    }

    $m = [];
    // ITEM 42 [118 b; 1354717302 s]
    $r = preg_match('/^ITEM\s([^\s]+)\s/', $l, $m);
    if ($r != 1)
    {
    return -5;
    }
    $a_key = $m[1];

    $a_slab[] = $a_key;
    }
    }

    // close the connection
    @fclose($mem);
    unset($mem);

    $keys = [];
    reset($slab);
    foreach ($slab AS &$a_slab)
    {
    reset($a_slab);
    foreach ($a_slab AS &$a_key)
    {
    $keys[] = $a_key;
    }
    }
    unset($slab);

    return $keys;
    }
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