PHP Conference Nagoya 2025

    Basic usage

    Приклад #1 memcache extension overview example

    In this example, an object is being saved in the cache and then retrieved back. Object and other non-scalar types are serialized before saving, so it's impossible to store resources (i.e. connection identifiers and others) in the cache.

    <?php

    $memcache     = new Memcache;
    $memcache->connect('localhost', 11211) or die ("Could not connect");

    $version = $memcache->getVersion();
    echo     "Server's version: ".$version."<br/>\n";

    $tmp_object = new stdClass;
    $tmp_object->str_attr = 'test';
    $tmp_object->int_attr = 123;

    $memcache->set('key', $tmp_object, false, 10) or die ("Failed to save data at the server");
    echo     "Store data in the cache (data will expire in 10 seconds)<br/>\n";

    $get_result = $memcache->get('key');
    echo     "Data from the cache:<br/>\n";

    var_dump($get_result);

    ?>

    Приклад #2 Using memcache session handler

    <?php

    $session_save_path     = "tcp://$host:$port?persistent=1&weight=2&timeout=2&retry_interval=10, ,tcp://$host:$port ";
    ini_set('session.save_handler', 'memcache');
    ini_set('session.save_path', $session_save_path);

    ?>

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    User Contributed Notes 2 notes

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    5
    atesin > gmail
    4 years ago
    memcached is great, is lightning fast, very versatile and useful, scalable, and is a must have for many projects

    but if you only want speed to minimize session file blocking there is also a good alternative, tmpfs

    https://eddmann.com/posts/storing-php-sessions-file-caches-in-memory-using-tmpfs/

    maybe if you are in debian you already had session directory in tmp (mounted as tmpfs), but beware of daily cleaning process that can mess up your sessions

    you can use this trick if you are in centos/other (like me) or even if you are in debian but want to get ride of /tmp cleaning task

    i realized in my system /run is also mounted as tmpfs, so i shut php-fpm down, moved my php session dir to /tmp/, reconfigure php and start again... (you can adapt it to your situation)

    systemctl stop php-fpm
    cp -a /var/lib/php/session /tmp/php-session
    vim /etc/php-fpm-d/www.conf
    ------
    php_value[session.save_path] = /run/php-session
    ------
    systemctl start php-fpm

    the only drawback is tmpfs is VOLATILE, just like memcached (data is lost on unmount/shutdown/power fail), to circumvent this risk i wrote another service that restores/backup php session dir before/after php starts/stops... (UNTESTED!)

    vim /etc/systemd/system/php-session-backup.service
    ------
    # basic persistence for tmpfs php sessions

    [Unit]
    Description=PHP tmpfs sessions backup/restore on shutdown/boot
    Before=php-fpm.service

    [Service]
    Type=oneshot
    RemainAfterExit=true
    ExecStart=rm -fr /run/php-session
    ExecStart=cp -fa /var/lib/php/session /run/php-session
    ExecStop=rm -fr /var/lib/php/session
    ExecStop=cp -fa /run/php-session /var/lib/php/session

    [Install]
    WantedBy=multi-user.target
    ------
    systemctl enable php-session-backup

    you can also complement this with a daily backup task in case of system crash so you will lose just one day

    crontab -e
    ------
    0 4 * * * rm -fr /var/lib/php/session;cp -fa /run/php-session /var/lib/php/session
    ------

    this is very rough though, you can better use inotify + rsync, could take some ideas from here

    https://blog.jmdawson.co.uk/persistent-ramdisk-on-debain-ubuntu/
    up
    -1
    atesin > gmail
    4 years ago
    moderator please merge these posts

    an errata to my comment done on 2020-07-28 01:05 about tmpfs session dir...

    the tmpfs directory i used to install session files is "/run" not "/tmp"... as /tmp is auto (or manual) deleted sometimes
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