Move memcached back in.

composer.json

@@ -36,7 +36,7 @@
 
         "nesbot/carbon" : "2.68.1",
 
-        "tsugi/lib": "dev-master#715bb90cc5913b7907f7a7e15dc71a52bfd8b4cc",
+        "tsugi/lib": "dev-master#a31404f87efd9c134f72c6197c0514c162993c57",
         "koseu/lib": "dev-master#70c7ac1ca413c2dd541e078ebe07719405621b1b"
     },
     "config": {

vendor/composer/installed.json

@@ -7511,12 +7511,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/tsugiproject/tsugi-php.git",
-                "reference": "715bb90cc5913b7907f7a7e15dc71a52bfd8b4cc"
+                "reference": "a31404f87efd9c134f72c6197c0514c162993c57"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/tsugiproject/tsugi-php/zipball/715bb90cc5913b7907f7a7e15dc71a52bfd8b4cc",
-                "reference": "715bb90cc5913b7907f7a7e15dc71a52bfd8b4cc",
+                "url": "https://api.github.com/repos/tsugiproject/tsugi-php/zipball/a31404f87efd9c134f72c6197c0514c162993c57",
+                "reference": "a31404f87efd9c134f72c6197c0514c162993c57",
                 "shasum": ""
             },
             "require": {

vendor/composer/installed.php

@@ -3,7 +3,7 @@
         'name' => '__root__',
         'pretty_version' => 'dev-master',
         'version' => 'dev-master',
-        'reference' => '770e466467c7313153a101a2593a8d45f610e61c',
+        'reference' => 'c22b2aaa016a624cbf74950754f46b13a00ddb7e',
         'type' => 'library',
         'install_path' => __DIR__ . '/../../',
         'aliases' => array(),
@@ -13,7 +13,7 @@
         '__root__' => array(
             'pretty_version' => 'dev-master',
             'version' => 'dev-master',
-            'reference' => '770e466467c7313153a101a2593a8d45f610e61c',
+            'reference' => 'c22b2aaa016a624cbf74950754f46b13a00ddb7e',
             'type' => 'library',
             'install_path' => __DIR__ . '/../../',
             'aliases' => array(),
@@ -1045,7 +1045,7 @@
         'tsugi/lib' => array(
             'pretty_version' => 'dev-master',
             'version' => 'dev-master',
-            'reference' => '715bb90cc5913b7907f7a7e15dc71a52bfd8b4cc',
+            'reference' => 'a31404f87efd9c134f72c6197c0514c162993c57',
             'type' => 'library',
             'install_path' => __DIR__ . '/../tsugi/lib',
             'aliases' => array(

vendor/tsugi/lib/src/Config/ConfigInfo.php

@@ -146,17 +146,46 @@ class ConfigInfo {
     /**
      * Support memcache for session caching
      *
-     * Store sessions in memcache - this seems like the fastest, best, and simplest approach
-     * when running on AWS.
+     * Memcache is php-only and so is likely to require less overall dependencies.
      *
-     * http://php.net/manual/en/memcached.sessions.php
+     * http://php.net/manual/en/memcache.sessions.php
+     *
+     * Installed on Ubuntu using
+     *
+     * apt-get install -y php${TSUGI_PHP_VERSION}-memcache
      *
-     * Note - prefer "memcache" over "memcached"
+     * You should only select one of memcache and memcached
      *
      * $CFG->memcache = 'tcp://memcache-tsugi.4984vw.cfg.use2.cache.amazonaws.com:11211';
+     *
+     * In addition to setting this variable, your config.php must include the code
+     * to configure the PHP session save handler as shown in config-dist.php
+     *
      */
     public $memcache;
 
+    /**
+     * Support memcached for session caching
+     *
+     * Memcached is a combination of PHP and C and so may require extra dependencies.
+     *
+     * http://php.net/manual/en/memcached.sessions.php
+     *
+     * Installed on Ubuntu using
+     *
+     * apt-get install -y php${TSUGI_PHP_VERSION}-memcached
+     *
+     * You should only select one of memcache and memcached
+     *
+     * $CFG->memcached = 'memcache-tsugi.4984vw.cfg.use2.cache.amazonaws.com:11211';
+     *
+     * Note no "tcp://" for the memcached version of the url
+     *
+     * In addition to setting this variable, your config.php must include the code
+     * to configure the PHP session save handler as shown in config-dist.php
+     */
+    public $memcached;
+
     /**
      * Adding in support for using Redis for session caching.
      *