Memcached::getAllKeys

(PECL memcached >= 2.0.0)

Memcached::getAllKeysObtiene las claves almacenadas en todos los servidores

Descripción

public Memcached::getAllKeys ( void ) : array

Memcached::getAllKeys() consulta cada servidor de memcache y recupera un array con todas las claves almacenadas en ellos en ese instante. Esta no es una operación atómica, por lo que no es una instantánea realmente consistente de las claves en ese momento. Debido a que memcache no garantiza la devolución de todas las claves, no se podrá asumir que han sido devueltas en su totalidad.

Parámetros

Esta función no tiene parámetros.

Valores devueltos

Devuelve las claves almacenadas en todos los servidores en caso de éxito o FALSE en caso de error.

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User Contributed Notes 6 notes

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3
harold at snel dot me
1 year 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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4
flaviu dot chelaru at gmail dot com
3 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);
    }
}
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5
xiangku7890 at gmail dot com
4 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.
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0
danb1974 at gmail dot com
11 days 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;
}
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-5
fykknd at 163 dot com
4 years ago
I got this answer..
My libmemcached version is 1.0.18. php-memcached version is 2.2.0
In Libmemcached at memcache.h line 84:
#define MAX_NUMBER_OF_SLAB_CLASSES (63 + 1)
Modify it to 201, compile again. It's ok.
主要还是版本不兼容造成的。libmemchaed里的一个bug,
memcached_return_t这个方法里的for循环,最大数是200,和上面的常量64定义不一致造成的。
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-7
Cuchac
5 years ago
This command returns always FALSE when binary protocol in use (Memcached::OPT_BINARY_PROTOCOL = true). Without binary protocol it works.
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