Note requirement for filter extension

composer.json

@@ -22,6 +22,7 @@
         "ext-intl": "*",
         "ext-json": "*",
         "ext-hash": "*",
+        "ext-filter": "*",
         "ext-dom": "*",
         "nicolus/picofeed": "^0.1.43",
         "hosteurope/password-generator": "1.*",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "2a87797422ae569bafcbb6476461ac38",
+    "content-hash": "c658930fbc56b2b2cf646e34c6a8d8d3",
     "packages": [
         {
             "name": "docopt/docopt",
@@ -1353,11 +1353,12 @@
         "ext-intl": "*",
         "ext-json": "*",
         "ext-hash": "*",
+        "ext-filter": "*",
         "ext-dom": "*"
     },
     "platform-dev": [],
     "platform-overrides": {
         "php": "7.1.33"
     },
-    "plugin-api-version": "2.0.0"
+    "plugin-api-version": "2.1.0"
 }

docs/en/020_Getting_Started/index.md

@@ -8,13 +8,13 @@ For reference, The Arsse has the following requirements:
 
 - A Linux server running Nginx or Apache 2.4
 - PHP 7.1.0 or later with the following extensions:
-    - [intl](http://php.net/manual/en/book.intl.php), [json](http://php.net/manual/en/book.json.php), [hash](http://php.net/manual/en/book.hash.php), and [dom](http://php.net/manual/en/book.dom.php)
-    - [simplexml](http://php.net/manual/en/book.simplexml.php), and [iconv](http://php.net/manual/en/book.iconv.php)
+    - [intl](https://php.net/manual/en/book.intl.php), [json](https://php.net/manual/en/book.json.php), [hash](https://php.net/manual/en/book.hash.php), [filter](https://php.net/manual/en/book.filter.php), and [dom](https://php.net/manual/en/book.dom.php)
+    - [simplexml](https://php.net/manual/en/book.simplexml.php), and [iconv](https://php.net/manual/en/book.iconv.php)
     - One of:
-        - [sqlite3](http://php.net/manual/en/book.sqlite3.php) or [pdo_sqlite](http://php.net/manual/en/ref.pdo-sqlite.php) for SQLite databases
-        - [pgsql](http://php.net/manual/en/book.pgsql.php) or [pdo_pgsql](http://php.net/manual/en/ref.pdo-pgsql.php) for PostgreSQL 10 or later databases
-        - [mysqli](http://php.net/manual/en/book.mysqli.php) or [pdo_mysql](http://php.net/manual/en/ref.pdo-mysql.php) for MySQL/Percona 8.0.11 or later databases
-    - [curl](http://php.net/manual/en/book.curl.php) (optional)
+        - [sqlite3](https://php.net/manual/en/book.sqlite3.php) or [pdo_sqlite](https://php.net/manual/en/ref.pdo-sqlite.php) for SQLite databases
+        - [pgsql](https://php.net/manual/en/book.pgsql.php) or [pdo_pgsql](https://php.net/manual/en/ref.pdo-pgsql.php) for PostgreSQL 10 or later databases
+        - [mysqli](https://php.net/manual/en/book.mysqli.php) or [pdo_mysql](https://php.net/manual/en/ref.pdo-mysql.php) for MySQL/Percona 8.0.11 or later databases
+    - [curl](https://php.net/manual/en/book.curl.php) (optional)
 - Privileges either to create and run systemd services, or to run cron jobs
 
 Instructions for how to satisfy the PHP extension requirements for Arch Linux and Debian systems are included in the next section.