Merge branch '5725-installer-check-for-required-php-modules' into 'stable-3.1'

Resolve "Installer: Check for required PHP modules"

Closes #5725

See merge request ispconfig/ispconfig3!1130

Author: Till Brehm

install/install.php

@@ -150,6 +150,8 @@
 $retval=shell_exec("which which");
 if (empty($retval)) die ("ISPConfig requieres which \n");
 
+$inst->check_prerequisites();
+
 swriteln($inst->lng('    Following will be a few questions for primary configuration so be careful.'));
 swriteln($inst->lng('    Default values are in [brackets] and can be accepted with <ENTER>.'));
 swriteln($inst->lng('    Tap in "quit" (without the quotes) to stop the installer.'."\n\n"));

install/lib/installer_base.lib.php

@@ -198,6 +198,18 @@ public function find_installed_apps() {
 
 		if (($conf['apache']['installed'] && is_file($conf['apache']["vhost_conf_enabled_dir"]."/000-ispconfig.vhost")) || ($conf['nginx']['installed'] && is_file($conf['nginx']["vhost_conf_enabled_dir"]."/000-ispconfig.vhost"))) $this->ispconfig_interface_installed = true;
 	}
+	
+	//** Check prerequisites
+	public function check_prerequisites() {
+		$msg = '';
+		
+		if(version_compare(phpversion(), '5.4', '<')) $msg .= "PHP Version 5.4 or newer is required. The currently used PHP version is ".phpversion().".\n";
+		if(!function_exists('curl_init')) $msg .= "PHP Curl Module is missing.\n";
+		if(!function_exists('mysqli_connect')) $msg .= "PHP MySQLi Module is nmissing.\n";
+		if(!function_exists('mb_detect_encoding')) $msg .= "PHP Multibyte Module (MB) is missing.\n";
+		
+		if($msg != '') die($msg);
+	}
 
     public function force_configure_app($service, $enable_force=true) {
 		$force = false;

install/update.php

@@ -188,6 +188,8 @@
 if (!$inst->get_php_version()) die('ISPConfig requieres PHP '.$inst->min_php."\n");
 $inst->is_update = true;
 
+$inst->check_prerequisites();
+
 echo "This application will update ISPConfig 3 on your server.\n\n";
 
 //* Make a backup before we start the update