diff --git a/include/ComboStrings.php b/include/ComboStrings.php
index a88f30444f7158d59e2290d21a319f8b2ea00fb0..dcf07af5f2e4d225e67b2d752780e20ade656e97 100644
--- a/include/ComboStrings.php
+++ b/include/ComboStrings.php
@@ -355,8 +355,7 @@ $combo_strings = Array(
 );
 
 require_once('modules/Users/UserTimeZonesArray.php');
-$usertimezonesClass = new UserTimeZones();
-$arrayOfSupportedTimeZones = $usertimezonesClass->userTimeZones();
+$arrayOfSupportedTimeZones = UserTimeZones::getAll();
 $combo_strings['time_zone_dom'] = array_combine($arrayOfSupportedTimeZones,$arrayOfSupportedTimeZones);
 
 ?>
diff --git a/include/database/PearDatabase.php b/include/database/PearDatabase.php
index 254fe9abc2974f6cef876173743c847296b63beb..06a705b891fbbba34c333c95bf7ba701084df4b3 100644
--- a/include/database/PearDatabase.php
+++ b/include/database/PearDatabase.php
@@ -306,7 +306,7 @@ class PearDatabase{
 	$this->executeSetNamesUTF8SQL();
 
 	$sql_start_time = microtime(true);
-	$result = & $this->database->Execute($sql);
+	$result = $this->database->Execute($sql);
 	$this->logSqlTiming($sql_start_time, microtime(true), $sql);
 
 	$this->lastmysqlrow = -1;
diff --git a/includes/runtime/Viewer.php b/includes/runtime/Viewer.php
index c2271e765c6aa0c92341b7a3e4da3a8174cea630..59876ddfd84e4a5fdb64324aef93041bdbb07aad 100644
--- a/includes/runtime/Viewer.php
+++ b/includes/runtime/Viewer.php
@@ -73,7 +73,7 @@ class Vtiger_Viewer extends Smarty {
 
 		$classes = array('Vtiger_MenuStructure_Model', 'Users_Privileges_Model', 
 			'Vtiger_Module_Model', 'Settings_MenuEditor_Module_Model', 'Vtiger_Util_Helper', 
-			'ZEND_JSON', 'Zend_Json', 'Zend_JSON',
+			'ZEND_JSON', 'Zend_Json', 'Zend_JSON', 'ZEND_json',
 			'Vtiger_Theme', 'Users_Record_Model', 'Vtiger_Module_Model', 'Vtiger_Field_Model', 
 			'Settings_Picklist_Module_Model', 'CustomView_Record_Model', 'Vtiger_Extension_View',
 			'Vtiger_Tag_Model',
@@ -87,8 +87,8 @@ class Vtiger_Viewer extends Smarty {
 		$modifiers = array('vtranslate', 'vtlib_isModuleActive', 'vimage_path', 'strstr', 'stripos', 'strpos', 'date', 'vtemplate_path', 'vresource_url', 
 			'decode_html', 'vtlib_purify', 'php7_count', 'getUserFullName', 'array_flip', 'explode', 'trim', 'array_push',
 			'array_map', 'array_key_exists', 'get_class', 'vtlib_array', 'getDuplicatesPreventionMessage', 'htmlentities',
-			'getCurrencySymbolandCRate', 'mb_substr', 'isPermitted', 'getEntityName',
-			'strtolower', 'strtoupper');
+			'getCurrencySymbolandCRate', 'mb_substr', 'isPermitted', 'getEntityName', 'function_exists',
+			'strtolower', 'strtoupper', 'str_replace', 'urlencode', 'getTranslatedCurrencyString', 'getTranslatedString', 'is_object', 'is_numeric');
 		foreach ($modifiers as $modifier) {
 			if (function_exists($modifier)) {
 				$this->registerPlugin('modifier', $modifier, $modifier);
diff --git a/libraries/adodb_vtigerfix/adodb-xmlschema.inc.php b/libraries/adodb_vtigerfix/adodb-xmlschema.inc.php
index 824dcb960f97dba1c2d4b088159de4e4d879df70..c01212aebd4cf26b9fe10ef6a4aae47124c2038b 100644
--- a/libraries/adodb_vtigerfix/adodb-xmlschema.inc.php
+++ b/libraries/adodb_vtigerfix/adodb-xmlschema.inc.php
@@ -556,7 +556,17 @@ class dbTable extends dbObject {
 					if( is_array( $opt ) ) {
 						$key = key( $opt );
 						$value = $opt[key( $opt )];
-						@$fldarray[$field_id][$key] .= $value;
+
+						// ensure fldarray[field_id] init.
+						if (!isset($fldarray[$field_id])) {
+							$fldarray[$field_id] = array();
+						}
+						// ensure fldarray[field_id][$key] init.
+						if (!isset($fldarray[$field_id][$key])) {
+							$fldarray[$field_id][$key] = "";
+						}
+						
+						$fldarray[$field_id][$key] .= $value;
 					// Option doesn't have arguments
 					} else {
 						$fldarray[$field_id][$opt] = $opt;
diff --git a/libraries/freetag/freetag.class.php b/libraries/freetag/freetag.class.php
index 7af7d61939a520463751c37f6d4db076f83428f2..ed1e014492dc88186c74193a7a165606468b8f3f 100644
--- a/libraries/freetag/freetag.class.php
+++ b/libraries/freetag/freetag.class.php
@@ -104,7 +104,7 @@ class freetag {
 	 * - PCONNECT: Whether to use ADODB persistent connections. [default: FALSE]
 	 * 
 	 */ 
-	function freetag($options = NULL) {
+	function __construct($options = NULL) {
 /*
 		$available_options = array('debug', 'db', 'db_user', 'db_pass', 'db_host', 'db_name', 'table_prefix', 'normalize_tags', 'normalized_valid_chars', 'block_multiuser_tag_on_object', 'MAX_TAG_LENGTH', 'ADODB_DIR', 'PCONNECT');
 		if (is_array($options)) {
diff --git a/modules/Install/views/Index.php b/modules/Install/views/Index.php
index dc6157e49a119cffadce326d01525ebbde96b44d..4ff2d1472c9a98634a3dabf0a370f5e548175a14 100644
--- a/modules/Install/views/Index.php
+++ b/modules/Install/views/Index.php
@@ -29,8 +29,8 @@ class Install_Index_view extends Vtiger_View_Controller {
 
 	protected function applyInstallFriendlyEnv() {
 		// config.inc.php - will not be ready to control this yet.
-		version_compare(PHP_VERSION, '5.5.0') <= 0 ? error_reporting(E_ERROR & ~E_NOTICE & ~E_DEPRECATED) : error_reporting(E_ERROR & ~E_NOTICE & ~E_DEPRECATED & ~E_STRICT);  // Production
-		//version_compare(PHP_VERSION, '7.0.0') >= 0 ? error_reporting(E_WARNING & ~E_NOTICE) : error_reporting(E_WARNING & ~E_NOTICE & ~E_DEPRECATED  & E_ERROR & ~E_STRICT); // Debug
+		// version_compare(PHP_VERSION, '5.5.0') <= 0 ? error_reporting(E_ERROR & ~E_NOTICE & ~E_DEPRECATED) : error_reporting(E_ERROR & ~E_NOTICE & ~E_DEPRECATED & ~E_STRICT);  // Production
+		// version_compare(PHP_VERSION, '7.0.0') >= 0 ? error_reporting(E_WARNING & ~E_NOTICE) : error_reporting(E_WARNING & ~E_NOTICE & ~E_DEPRECATED  & E_ERROR & ~E_STRICT); // Debug
 		set_time_limit(0); // override limits on execution time to allow install to finish
 	}
 
@@ -99,8 +99,7 @@ class Install_Index_view extends Vtiger_View_Controller {
 		$viewer->assign('CURRENCIES', Install_Utils_Model::getCurrencyList());
 
 		require_once 'modules/Users/UserTimeZonesArray.php';
-		$timeZone = new UserTimeZones();
-		$viewer->assign('TIMEZONES', $timeZone->userTimeZones());
+		$viewer->assign('TIMEZONES', UserTimeZones::getAll());
 
 		$defaultParameters = Install_Utils_Model::getDefaultPreInstallParameters();
 		$viewer->assign('DB_HOSTNAME', $defaultParameters['db_hostname']);
diff --git a/modules/Migration/schema/701_to_710.php b/modules/Migration/schema/701_to_710.php
index 252ff82ddffea3c904d7aa8d9510adad8a0d603f..8462a16928a4ca8170a0177db77c669f25e597c6 100644
--- a/modules/Migration/schema/701_to_710.php
+++ b/modules/Migration/schema/701_to_710.php
@@ -156,7 +156,8 @@ if (defined('VTIGER_UPGRADE')) {
 	$packageModules = array('Project', 'ProjectTask', 'ProjectMilestone'); /* Projects zip is bundle */
 	$packageZips = glob("packages/vtiger/*/*.zip");
 	foreach ($packageZips as $zipfile) {
-		$packageModules[] = str_replace('.zip', '', array_pop(explode("/", $zipfile)));
+		$parts = explode("/", $zipfile);
+		$packageModules[] = str_replace('.zip', '', array_pop($parts));
 	}
 
 	$db->pquery('UPDATE vtiger_tab SET source="custom" WHERE version IS NOT NULL AND name NOT IN ('.generateQuestionMarks($packageModules).')', $packageModules);
diff --git a/modules/Migration/schema/720_to_730.php b/modules/Migration/schema/720_to_730.php
index d048909f4299812fc2e5a43129018382b39c96cf..7c18c3760c83993e8c9d3d09a3b0210f5d8bc4cd 100644
--- a/modules/Migration/schema/720_to_730.php
+++ b/modules/Migration/schema/720_to_730.php
@@ -96,7 +96,7 @@ if (defined('VTIGER_UPGRADE')) {
     //Migrate default module data from config editor to database
     $moduleModel = Settings_Vtiger_ConfigModule_Model::getInstance();
     $configFieldData = $moduleModel->getViewableData();
-    $defaultModule = $configFieldData['default_module'];
+    $defaultModule = isset($configFieldData['default_module']) ? $configFieldData['default_module'] : "";
     if(empty($defaultModule)){
         $defaultModule = 'Home';
     }
@@ -297,4 +297,4 @@ if (defined('VTIGER_UPGRADE')) {
     $db->pquery('ALTER TABLE vtiger_calendar_default_activitytypes ADD COLUMN conditions VARCHAR(255) DEFAULT ""', array());
     
     echo 'Conditions column in vtiger_calendar_default_activitytypes updated';
-}
\ No newline at end of file
+}
diff --git a/modules/Users/UserTimeZonesArray.php b/modules/Users/UserTimeZonesArray.php
index f39629134b5dce62b06b60b1372d1f991f2e127c..f4166cbd5bae3eb305a7f594ae53669e3bf38d1d 100644
--- a/modules/Users/UserTimeZonesArray.php
+++ b/modules/Users/UserTimeZonesArray.php
@@ -13,7 +13,7 @@
  * Contributor(s): ______________________________________.
  ********************************************************************************/
 class UserTimeZones{
-	function __construct(){
+	static function getAll(){
 		$arrayOfSupportedTimeZones = array(
 										'Pacific/Midway',
 										'Pacific/Samoa',
diff --git a/modules/com_vtiger_workflow/VTWorkflowManager.inc b/modules/com_vtiger_workflow/VTWorkflowManager.inc
index 6766a56b322c78ba38552a5f720185604534c8c1..276150c4c46bb74e7f32317e0b570d4ab2fb52d7 100644
--- a/modules/com_vtiger_workflow/VTWorkflowManager.inc
+++ b/modules/com_vtiger_workflow/VTWorkflowManager.inc
@@ -354,6 +354,10 @@ class Workflow{
 		$this->conditionStrategy = new VTJsonCondition();
 	}
 
+	function __get($name) {
+		return property_exists($this, $name) ? $this->$name : null;
+	}
+
 	function setup($row) {
 		$this->id = $row['workflow_id'];
 		$this->moduleName = $row['module_name'];
diff --git a/vtlib/Vtiger/FieldBasic.php b/vtlib/Vtiger/FieldBasic.php
index 4423a0445c1b0539589e4c741725733d3f84250c..ab6c4425f63867fe68926c7d1940926c5ca89e82 100644
--- a/vtlib/Vtiger/FieldBasic.php
+++ b/vtlib/Vtiger/FieldBasic.php
@@ -56,6 +56,8 @@ class Vtiger_FieldBasic {
 	 * @access private
 	 */
 	function initialize($valuemap, $moduleInstance=false, $blockInstance=false) {
+		$valuemap = vtlib_array($valuemap);
+
 		$this->id = $valuemap['fieldid'];
 		$this->name = $valuemap['fieldname'];
 		$this->label= $valuemap['fieldlabel'];
diff --git a/vtlib/Vtiger/Functions.php b/vtlib/Vtiger/Functions.php
index e937992e728caa33639cc27f967819c748eb2743..e8690dce77e425793f928dd4be9d224106466d48 100644
--- a/vtlib/Vtiger/Functions.php
+++ b/vtlib/Vtiger/Functions.php
@@ -463,9 +463,11 @@ class Vtiger_Functions {
 			while ($row = $adb->fetch_array($result)) {
 				$moduleFieldInfo[$module][$row['fieldname']] = $row;
 			}
-			Vtiger_Cache::set('ModuleFieldInfo',$module,$moduleFieldInfo[$module]);
+			if (isset($moduleFieldInfo[$module])) {
+				Vtiger_Cache::set('ModuleFieldInfo',$module,$moduleFieldInfo[$module]);
+			}
 		}
-		return $moduleFieldInfo[$module] ? $moduleFieldInfo[$module] : NULL;
+		return isset($moduleFieldInfo[$module]) ? $moduleFieldInfo[$module] : NULL;
 	}
 
 	static function getModuleFieldInfoWithId($fieldid) {
diff --git a/vtlib/Vtiger/LanguageImport.php b/vtlib/Vtiger/LanguageImport.php
index 447995c02e0c112e9c7e51039a9c11a6537e66ea..90b7b52752e625eaf7ad38777d56b69e82a1f2d9 100644
--- a/vtlib/Vtiger/LanguageImport.php
+++ b/vtlib/Vtiger/LanguageImport.php
@@ -127,7 +127,9 @@ class Vtiger_LanguageImport extends Vtiger_LanguageExport {
 					// vtiger6 format
 					if ($vtiger6format) {
 						$targetdir = "languages/$prefix/" . str_replace("modules", "", $targetdir);
-						@mkdir($targetdir, 0777, true);
+						if (!file_exists($targetdir)) {
+							mkdir($targetdir, 0777, true);
+						}
 					}
 
 					if($unzip->unzip($filename, "$targetdir/$targetfile") !== false) {
@@ -148,4 +150,4 @@ class Vtiger_LanguageImport extends Vtiger_LanguageExport {
 
 		return;
 	}
-}
\ No newline at end of file
+}
diff --git a/vtlib/Vtiger/PackageImport.php b/vtlib/Vtiger/PackageImport.php
index 51a2aa9b54d04d620dab8c5f1b9da361fc1d1c9e..3ab7b0c40d7dbaebec0c6985dcb5361ceeb18039 100644
--- a/vtlib/Vtiger/PackageImport.php
+++ b/vtlib/Vtiger/PackageImport.php
@@ -186,6 +186,7 @@ class Vtiger_PackageImport extends Vtiger_PackageExport {
 		$languagefile_found = false;
 		$layoutfile_found = false;
 		$vtigerversion_found = false;
+		$extensionfile_found = false;
 
 		$modulename = null;
 		$language_modulename = null;
diff --git a/vtlib/Vtiger/Unzip.php b/vtlib/Vtiger/Unzip.php
index e2b212077c084e3060c907225064678de762ac6c..a11a93afe6fd10752c29854730b95740a5455cb7 100644
--- a/vtlib/Vtiger/Unzip.php
+++ b/vtlib/Vtiger/Unzip.php
@@ -63,7 +63,7 @@ class Vtiger_Unzip extends dUnzip2 {
 		 * DEFAULT: If include is specified only files under the specified path will be included.
 		 * If exclude is specified folders or files will be excluded.
 		 */
-		if($includeExclude === false) $includeExclude = Array();
+		$includeExclude = vtlib_array($includeExclude);
 
 		$lista = $this->getList();
 		if(sizeof($lista)) foreach($lista as $fileName=>$trash){
diff --git a/vtlib/Vtiger/Utils/GuardedArray.php b/vtlib/Vtiger/Utils/GuardedArray.php
index f522a01418bf56084dbde5f5b762c6710e08fbd8..d32b0bcf2656d6133b31aa264a10437577274e31 100644
--- a/vtlib/Vtiger/Utils/GuardedArray.php
+++ b/vtlib/Vtiger/Utils/GuardedArray.php
@@ -12,7 +12,7 @@ class Vtiger_GuardedArray implements \ArrayAccess {
     private $data;
 
     function __construct($data = null) {
-        $this->data = is_null($data) ? array() : $data;
+        $this->data = is_null($data) || $data === false ? array() : $data;
     }
 
     function offsetExists($key) {
@@ -33,4 +33,4 @@ class Vtiger_GuardedArray implements \ArrayAccess {
     function offsetUnset($key) {
         unset($this->data[$key]);
     }
-}
\ No newline at end of file
+}