PHP: Utilisation basique

Utilisation basique

Exemple #1 Exemple avec l'extension Memcache

Dans cet exemple, un objet est sauvegardé dans le cache et ensuite, affiché. Les objets ainsi que les autres types non-scalaires sont sérialisés avant d'être sauvegardé ; il est donc impossible d'y stocker des ressources (i.e. identifiant de connexion et autres) dans le cache.

<?php

$memcache = new Memcache;
$memcache->connect('localhost', 11211) or die ("Connexion impossible");

$version = $memcache->getVersion();
echo "Version du serveur : ".$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 ("Echec de la sauvegarde des données sur le serveur");
echo "Les données ont été stockées dans le cache (les données expireront dans 10 secondes)<br/>\n";

$get_result = $memcache->get('key');
echo "Données depuis le cache :<br/>\n";

var_dump($get_result);

?>

Exemple #2 Utilisation de memcache comme gestionnaire de session

<?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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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/

down

-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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