Updated installer dependency to PHP 5.6 and ext-xml

- Updated doc

INSTALL.txt

@@ -32,7 +32,7 @@ link if your cert is self-signed).
 	- Apache with mod-rewrite enabled and "Options All" so you can use a
 local .htaccess file
 
-	- PHP 5.4+.
+	- PHP 5.6+ (PHP 7 recommended for performance).
 
 		- PHP *command line* access with register_argc_argv set to true in the
 php.ini file [or see 'poormancron' in section 8]

composer.json

@@ -13,6 +13,8 @@
 		"issues": "https://github.com/friendica/friendica/issues"
 	},
 	"require": {
+		"php": ">5.6",
+		"ext-xml": "*",
 		"ezyang/htmlpurifier": "~4.7.0",
 		"mobiledetect/mobiledetectlib": "2.8.*",
 		"league/html-to-markdown": "~4.4.1",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "13adf05bb2ebf7a11d9fc4b756fd8fb4",
+    "content-hash": "7a5d27cfcae62b1d9d10a10a343c0c96",
     "packages": [
         {
             "name": "defuse/php-encryption",
@@ -668,6 +668,9 @@
     },
     "prefer-stable": false,
     "prefer-lowest": false,
-    "platform": [],
+    "platform": {
+        "php": ">5.6",
+        "ext-xml": "*"
+    },
     "platform-dev": []
 }

doc/Install.md

@@ -26,7 +26,7 @@ Requirements
 ---
 
 * Apache with mod-rewrite enabled and "Options All" so you can use a local .htaccess file
-* PHP 5.4+.
+* PHP 5.6+ (PHP 7 is recommended for performance)
 * PHP *command line* access with register_argc_argv set to true in the php.ini file
 * Curl, GD, PDO, MySQLi, hash, xml and OpenSSL extensions
 * some form of email server or email gateway such that PHP mail() works

doc/de/Install.md

@@ -22,7 +22,7 @@ Wir planen, diese Einschränkung in einer zukünftigen Version zu beheben.
 
 1. Voraussetzungen
     - Apache mit einer aktiverten mod-rewrite-Funktion und dem Eintrag "Options All", so dass du die lokale .htaccess-Datei nutzen kannst
-    - PHP  5.4+. Je neuer, desto besser.
+    - PHP  5.6+. Je neuer, desto besser.
         - PHP *Kommandozeilen*-Zugang mit register_argc_argv auf "true" gesetzt in der php.ini-Datei
         - Curl, GD, PDO, MySQLi, xml und OpenSSL-Erweiterung
         - etwas in der Art eines Email-Servers oder eines Gateways wie PHP mail()