diff --git a/main/inc/lib/formvalidator/Element/calendar_popup.php b/main/inc/lib/formvalidator/Element/calendar_popup.php
index e237fa23a4..a0fc2c22d2 100755
--- a/main/inc/lib/formvalidator/Element/calendar_popup.php
+++ b/main/inc/lib/formvalidator/Element/calendar_popup.php
@@ -1,26 +1,5 @@
 <?php
-// $Id: calendar_popup.php 20456 2009-05-10 17:27:44Z ivantcholakov $
-/*
-==============================================================================
-	Dokeos - elearning and course management software
-
-	Copyright (c) 2004-2005 Dokeos S.A.
-	Copyright (c) Bart Mollet, Hogeschool Gent
-
-	For a full list of contributors, see "credits.txt".
-	The full license can be read in "license.txt".
-
-	This program is free software; you can redistribute it and/or
-	modify it under the terms of the GNU General Public License
-	as published by the Free Software Foundation; either version 2
-	of the License, or (at your option) any later version.
-
-	See the GNU General Public License for more details.
-
-	Contact address: Dokeos, 44 rue des palais, B-1030 Brussels, Belgium
-	Mail: info@dokeos.com
-==============================================================================
-*/
+/* For licensing terms, see /license.txt */
 
 $language_file = 'agenda';
 require_once dirname(__FILE__).'/../../../global.inc.php';
diff --git a/main/inc/lib/formvalidator/Element/datepickerdate.php b/main/inc/lib/formvalidator/Element/datepickerdate.php
index 45e776f874..a1fdbb554a 100644
--- a/main/inc/lib/formvalidator/Element/datepickerdate.php
+++ b/main/inc/lib/formvalidator/Element/datepickerdate.php
@@ -1,6 +1,6 @@
 <?php
 /* For licensing terms, see /license.txt */
-require_once ('HTML/QuickForm/date.php');
+require_once 'HTML/QuickForm/date.php';
 /**
  * Form element to select a date and hour (with popup datepicker)
  */
@@ -9,7 +9,8 @@ class HTML_QuickForm_datepickerdate extends HTML_QuickForm_date
 	/**
 	 * Constructor
 	 */
-	function HTML_QuickForm_datepickerdate($elementName = null, $elementLabel = null, $attributes = null) {
+	function HTML_QuickForm_datepickerdate($elementName = null, $elementLabel = null, $attributes = null)
+    {
 		global $myMinYear, $myMaxYear;
 		$js_form_name = $attributes['form_name'];
 		unset($attributes['form_name']);
diff --git a/main/inc/lib/formvalidator/Element/html_editor.php b/main/inc/lib/formvalidator/Element/html_editor.php
index 794f33034d..9ec20d4686 100644
--- a/main/inc/lib/formvalidator/Element/html_editor.php
+++ b/main/inc/lib/formvalidator/Element/html_editor.php
@@ -20,11 +20,17 @@ class HTML_QuickForm_html_editor extends HTML_QuickForm_textarea
      */
     public $richEditorStatus = true;
 
+    /**
+     * @return bool
+     */
     public function getRichEditorStatus()
     {
         return $this->richEditorStatus;
     }
 
+    /**
+     * @param $status
+     */
     public function setRichEditorStatus($status)
     {
         $this->richEditorStatus = (bool)$status;
@@ -37,7 +43,7 @@ class HTML_QuickForm_html_editor extends HTML_QuickForm_textarea
      * @param   string  Attributes for the textarea
      * @param array $editor_config	Optional configuration settings for the online editor.
      */
-    function HTML_QuickForm_html_editor($elementName = null, $elementLabel = null, $attributes = null, $config = null)
+    public function HTML_QuickForm_html_editor($elementName = null, $elementLabel = null, $attributes = null, $config = null)
     {
         if (empty($elementName)) {
             return false;
@@ -50,11 +56,9 @@ class HTML_QuickForm_html_editor extends HTML_QuickForm_textarea
         $this->_persistantFreeze = true;
         $this->_type = 'html_editor';
         $this->fullPage = false;
-
         $name = $this->getAttribute('name');
 
         global $app;
-        //$this->fck_editor = new FCKeditor($name);
         $this->fck_editor = new ChamiloLMS\Component\Editor\Editor($name, $app['translator']);
 
         $this->fck_editor->ToolbarSet = $fck_attribute['ToolbarSet'];
@@ -89,7 +93,8 @@ class HTML_QuickForm_html_editor extends HTML_QuickForm_textarea
      * @access public
      * @return boolean
      */
-    function browserSupported() {
+    function browserSupported()
+    {
         return FCKeditor :: IsCompatible();
     }
 
@@ -97,7 +102,7 @@ class HTML_QuickForm_html_editor extends HTML_QuickForm_textarea
      * Return the HTML editor in HTML
      * @return string
      */
-    function toHtml()
+    public function toHtml()
     {
         if ($this->getRichEditorStatus() == false) {
             //Fix rows and cols
@@ -125,7 +130,7 @@ class HTML_QuickForm_html_editor extends HTML_QuickForm_textarea
      * Returns the htmlarea content in HTML
      * @return string
      */
-    function getFrozenHtml()
+    public function getFrozenHtml()
     {
         return $this->getValue();
     }
@@ -133,7 +138,7 @@ class HTML_QuickForm_html_editor extends HTML_QuickForm_textarea
     /**
      * Build this element using FCKeditor
      */
-    function build_FCKeditor()
+    public function build_FCKeditor()
     {
         if (!FCKeditor :: IsCompatible()) {
             return parent::toHTML();
diff --git a/main/inc/lib/formvalidator/Element/receivers.php b/main/inc/lib/formvalidator/Element/receivers.php
index 398259c584..aa44a80cb8 100644
--- a/main/inc/lib/formvalidator/Element/receivers.php
+++ b/main/inc/lib/formvalidator/Element/receivers.php
@@ -1,26 +1,6 @@
 <?php
-// $Id: receivers.php 7727 2006-02-09 13:37:04Z turboke $
-/*
-==============================================================================
-	Dokeos - elearning and course management software
+/* For licensing terms, see /license.txt */
 
-	Copyright (c) 2004-2005 Dokeos S.A.
-	Copyright (c) Bart Mollet, Hogeschool Gent
-
-	For a full list of contributors, see "credits.txt".
-	The full license can be read in "license.txt".
-
-	This program is free software; you can redistribute it and/or
-	modify it under the terms of the GNU General Public License
-	as published by the Free Software Foundation; either version 2
-	of the License, or (at your option) any later version.
-
-	See the GNU General Public License for more details.
-
-	Contact address: Dokeos, 44 rue des palais, B-1030 Brussels, Belgium
-	Mail: info@dokeos.com
-==============================================================================
-*/
 require_once 'HTML/QuickForm/group.php';
 require_once 'HTML/QuickForm/radio.php';
 require_once 'HTML/QuickForm/advmultiselect.php';
@@ -59,6 +39,7 @@ class HTML_QuickForm_receivers extends HTML_QuickForm_group
 		$this->_appendName = true;
 		$this->_type = 'receivers';
 	}
+
 	/**
 	 * Create the form elements to build this element group
 	 */
@@ -70,6 +51,7 @@ class HTML_QuickForm_receivers extends HTML_QuickForm_group
 		$this->_elements[] = new HTML_QuickForm_advmultiselect('to', '', $this->receivers);
 		$this->_elements[2]->setSelected($this->receivers_selected);
 	}
+
 	/**
 	 * HTML representation
 	 */
@@ -85,6 +67,7 @@ class HTML_QuickForm_receivers extends HTML_QuickForm_group
 		$js = $this->getElementJS();
 		return $renderer->toHtml().$js;
 	}
+
 	/**
 	 * Get the necessary javascript
 	 */
@@ -105,6 +88,7 @@ class HTML_QuickForm_receivers extends HTML_QuickForm_group
 					</script>\n";
 		return $js;
 	}
+
 	/**
 	 * accept renderer
 	 */
@@ -113,4 +97,3 @@ class HTML_QuickForm_receivers extends HTML_QuickForm_group
 		$renderer->renderElement($this, $required, $error);
 	}
 }
-?>
\ No newline at end of file
diff --git a/main/inc/lib/formvalidator/Element/style_button.php b/main/inc/lib/formvalidator/Element/style_button.php
index 489a2011ca..e0be56d6b4 100644
--- a/main/inc/lib/formvalidator/Element/style_button.php
+++ b/main/inc/lib/formvalidator/Element/style_button.php
@@ -1,4 +1,6 @@
 <?php
+/* For licensing terms, see /license.txt */
+
 /**
  * Base class for <input /> form elements
  *
@@ -59,8 +61,9 @@ class HTML_QuickForm_stylebutton extends HTML_QuickForm_element
         $strAttr = '';
         if (is_array($attributes)) {
             foreach ($attributes as $key => $value) {
-            	if ($key != 'value')
+            	if ($key != 'value') {
                     $strAttr .= ' ' . $key . '="' . htmlspecialchars($value) . '"';
+                }
             }
         }
         return $strAttr;
@@ -199,4 +202,4 @@ class HTML_QuickForm_stylebutton extends HTML_QuickForm_element
             return parent::exportValue($submitValues, $assoc);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/main/inc/lib/formvalidator/Element/style_submit_button.php b/main/inc/lib/formvalidator/Element/style_submit_button.php
index 53b861c84e..ee3e1c9ff8 100644
--- a/main/inc/lib/formvalidator/Element/style_submit_button.php
+++ b/main/inc/lib/formvalidator/Element/style_submit_button.php
@@ -1,10 +1,7 @@
 <?php
-/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
-
 /**
  * HTML class for a submit type element
  *
- * PHP versions 4 and 5
  *
  * LICENSE: This source file is subject to version 3.01 of the PHP license
  * that is available through the world-wide-web at the following URI:
@@ -39,8 +36,6 @@ require_once 'style_button.php';
  */
 class HTML_QuickForm_stylesubmitbutton extends HTML_QuickForm_stylebutton
 {
-    // {{{ constructor
-
     /**
      * Class constructor
      *
@@ -51,20 +46,21 @@ class HTML_QuickForm_stylesubmitbutton extends HTML_QuickForm_stylebutton
      * @access    public
      * @return    void
      */
-    function HTML_QuickForm_stylesubmitbutton($elementName = null, $value = null, $attributes = null, $img = null) {
+    public function HTML_QuickForm_stylesubmitbutton($elementName = null, $value = null, $attributes = null, $img = null)
+    {
         if (empty($attributes)) {
             $attributes = array();
         }
-        
+
         if (!isset($attributes['class'])) {
             if (is_array($attributes)) {
                 $attributes['class'] = 'btn btn-primary';
-            }            
+            }
         }
         HTML_QuickForm_stylebutton::HTML_QuickForm_stylebutton($elementName, null, $attributes, $value, $img);
         $this->setValue($value);
         $this->setType('submit');
-    } //end constructor
+    }
 
     /**
      * Freeze the element so that only its value is returned
@@ -72,19 +68,17 @@ class HTML_QuickForm_stylesubmitbutton extends HTML_QuickForm_stylebutton
      * @access    public
      * @return    void
      */
-    function freeze() {
+    public function freeze()
+    {
         return false;
-    } //end func freeze
-
-    // }}}
-    // {{{ exportValue()
+    }
 
    /**
     * Only return the value if it is found within $submitValues (i.e. if
     * this particular submit button was clicked)
     */
-    function exportValue(&$submitValues, $assoc = false) {
+    public function exportValue(&$submitValues, $assoc = false)
+    {
         return $this->_prepareValue($this->_findValue($submitValues), $assoc);
     }
-    // }}}
-} //end class HTML_QuickForm_submit
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/main/inc/lib/formvalidator/FormValidator.class.php b/main/inc/lib/formvalidator/FormValidator.class.php
index 480fc0cfae..51e0e7ed44 100644
--- a/main/inc/lib/formvalidator/FormValidator.class.php
+++ b/main/inc/lib/formvalidator/FormValidator.class.php
@@ -1,5 +1,4 @@
 <?php
-
 /* For licensing terms, see /license.txt */
 
 /**
diff --git a/main/inc/lib/formvalidator/Rule/CompareDateTimeText.php b/main/inc/lib/formvalidator/Rule/CompareDateTimeText.php
index 069c3302ab..5c18b6c875 100644
--- a/main/inc/lib/formvalidator/Rule/CompareDateTimeText.php
+++ b/main/inc/lib/formvalidator/Rule/CompareDateTimeText.php
@@ -1,4 +1,5 @@
 <?php
+/* For licensing terms, see /license.txt */
 
 require_once 'HTML/QuickForm/Rule/Compare.php';
 /**
@@ -7,21 +8,21 @@ require_once 'HTML/QuickForm/Rule/Compare.php';
 class HTML_QuickForm_Rule_CompareDateTimeText extends HTML_QuickForm_Rule_Compare
 {
     /**
-     * Validate 2 dates          
+     * Validate 2 dates
      * @param string $operator The operator to use (default '==')
      * @return boolean True if the 2 given dates match the operator
      */
     function validate($values, $operator = null) {
     	$datetime1 = api_strtotime($values[0]);
-        $datetime2 = api_strtotime($values[1]);   	
-        
+        $datetime2 = api_strtotime($values[1]);
+
         if (strpos($operator, 'allow_empty') !== false) {
-            $operator = str_replace('allow_empty', '', $operator);            
-            if (!$datetime2 || empty($datetime2)) { 
+            $operator = str_replace('allow_empty', '', $operator);
+            if (!$datetime2 || empty($datetime2)) {
                 return true;
             }
         }
-		$result =  parent::validate(array($datetime1, $datetime2), $operator);        
+		$result =  parent::validate(array($datetime1, $datetime2), $operator);
         return $result;
     }
 }
\ No newline at end of file
diff --git a/main/inc/lib/formvalidator/Rule/CompareFields.php b/main/inc/lib/formvalidator/Rule/CompareFields.php
index 4f28a1c297..8db220b480 100644
--- a/main/inc/lib/formvalidator/Rule/CompareFields.php
+++ b/main/inc/lib/formvalidator/Rule/CompareFields.php
@@ -1,12 +1,13 @@
 <?php
+/* For licensing terms, see /license.txt */
 require_once 'HTML/QuickForm/Rule.php';
 /**
  * QuickForm rule to check a date
  */
-class HTML_QuickForm_Compare_Fields extends HTML_QuickForm_Rule_Compare 
+class HTML_QuickForm_Compare_Fields extends HTML_QuickForm_Rule_Compare
 {
 	/**
-	 * Function to check an array of fields 	 
+	 * Function to check an array of fields
 	 * @param   array of field names
      * @param   string operator ==, >=, etc
      * @param   string the value to compare
@@ -20,9 +21,9 @@ class HTML_QuickForm_Compare_Fields extends HTML_QuickForm_Rule_Compare
            }
            $params = explode('@', $operator_and_max_value);
            $operator    = $params[0];
-           $max_value   = $params[1];                      
+           $max_value   = $params[1];
            return parent::validate(array($final_value, $max_value), $operator);
         }
-        return false;        
+        return false;
 	}
 }
\ No newline at end of file
diff --git a/main/inc/lib/formvalidator/Rule/Date.php b/main/inc/lib/formvalidator/Rule/Date.php
index 03f3eab82d..f9b040dd21 100644
--- a/main/inc/lib/formvalidator/Rule/Date.php
+++ b/main/inc/lib/formvalidator/Rule/Date.php
@@ -1,26 +1,5 @@
 <?php
-// $Id: Date.php 6187 2005-09-07 10:23:57Z bmol $
-/*
-==============================================================================
-	Dokeos - elearning and course management software
-
-	Copyright (c) 2004-2005 Dokeos S.A.
-	Copyright (c) Bart Mollet, Hogeschool Gent
-
-	For a full list of contributors, see "credits.txt".
-	The full license can be read in "license.txt".
-
-	This program is free software; you can redistribute it and/or
-	modify it under the terms of the GNU General Public License
-	as published by the Free Software Foundation; either version 2
-	of the License, or (at your option) any later version.
-
-	See the GNU General Public License for more details.
-
-	Contact address: Dokeos, 44 rue des palais, B-1030 Brussels, Belgium
-	Mail: info@dokeos.com
-==============================================================================
-*/
+/* For licensing terms, see /license.txt */
 require_once ('HTML/QuickForm/Rule.php');
 /**
  * QuickForm rule to check a date
diff --git a/main/inc/lib/formvalidator/Rule/DateCompare.php b/main/inc/lib/formvalidator/Rule/DateCompare.php
index 663f4785d5..0e3bdce07c 100644
--- a/main/inc/lib/formvalidator/Rule/DateCompare.php
+++ b/main/inc/lib/formvalidator/Rule/DateCompare.php
@@ -1,26 +1,5 @@
 <?php
-// $Id: DateCompare.php 6187 2005-09-07 10:23:57Z bmol $
-/*
-==============================================================================
-	Dokeos - elearning and course management software
-
-	Copyright (c) 2004-2005 Dokeos S.A.
-	Copyright (c) Bart Mollet, Hogeschool Gent
-
-	For a full list of contributors, see "credits.txt".
-	The full license can be read in "license.txt".
-
-	This program is free software; you can redistribute it and/or
-	modify it under the terms of the GNU General Public License
-	as published by the Free Software Foundation; either version 2
-	of the License, or (at your option) any later version.
-
-	See the GNU General Public License for more details.
-
-	Contact address: Dokeos, 44 rue des palais, B-1030 Brussels, Belgium
-	Mail: info@dokeos.com
-==============================================================================
-*/
+/* For licensing terms, see /license.txt */
 require_once 'HTML/QuickForm/Rule/Compare.php';
 /**
  * QuickForm rule to compare 2 dates
@@ -42,5 +21,4 @@ class HTML_QuickForm_Rule_DateCompare extends HTML_QuickForm_Rule_Compare
         $time2 = mktime($date2['H'],$date2['i'],0,$date2['F'],$date2['d'],$date2['Y']);
 		return parent::validate(array($time1,$time2),$operator);
     }
-}
-?>
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/main/inc/lib/formvalidator/Rule/Filetype.php b/main/inc/lib/formvalidator/Rule/Filetype.php
index ef0682ebba..d1350a008c 100644
--- a/main/inc/lib/formvalidator/Rule/Filetype.php
+++ b/main/inc/lib/formvalidator/Rule/Filetype.php
@@ -1,26 +1,6 @@
 <?php
-// $Id: Filetype.php 20456 2009-05-10 17:27:44Z ivantcholakov $
-/*
-==============================================================================
-	Dokeos - elearning and course management software
+/* For licensing terms, see /license.txt */
 
-	Copyright (c) 2004-2005 Dokeos S.A.
-	Copyright (c) Bart Mollet, Hogeschool Gent
-
-	For a full list of contributors, see "credits.txt".
-	The full license can be read in "license.txt".
-
-	This program is free software; you can redistribute it and/or
-	modify it under the terms of the GNU General Public License
-	as published by the Free Software Foundation; either version 2
-	of the License, or (at your option) any later version.
-
-	See the GNU General Public License for more details.
-
-	Contact address: Dokeos, 44 rue des palais, B-1030 Brussels, Belgium
-	Mail: info@dokeos.com
-==============================================================================
-*/
 require_once ('HTML/QuickForm/Rule.php');
 /**
  * QuickForm rule to check if a filetype
@@ -45,4 +25,3 @@ class HTML_QuickForm_Rule_Filetype extends HTML_QuickForm_Rule
 		return api_in_array_nocase($ext, $extensions);
 	}
 }
-?>
diff --git a/main/inc/lib/formvalidator/Rule/MultipleRequired.php b/main/inc/lib/formvalidator/Rule/MultipleRequired.php
index c1ba994d7f..76bfa082c5 100755
--- a/main/inc/lib/formvalidator/Rule/MultipleRequired.php
+++ b/main/inc/lib/formvalidator/Rule/MultipleRequired.php
@@ -1,15 +1,6 @@
 <?php
-/* vim: set expandtab tabstop=4 shiftwidth=4: */
-// +----------------------------------------------------------------------+
-// | PHP version 4.0                                                      |
-// +----------------------------------------------------------------------+
-// | Copyright (c) 1997-2003 The PHP Group                                |
-// +----------------------------------------------------------------------+
-// | Copy of the existing rule "required" to check if at least one element|
-// | has been filled. Then $value can be an array						  |
-// +----------------------------------------------------------------------+
-// | Authors: Eric Marguin <e.marguin@elixir-interactive.com>             |
-// +----------------------------------------------------------------------+
+
+/* For licensing terms, see /license.txt */
 
 require_once('HTML/QuickForm/Rule.php');
 
@@ -46,4 +37,3 @@ class HTML_QuickForm_Rule_MultipleRequired extends HTML_QuickForm_Rule
     } // end func getValidationScript
 
 } // end class HTML_QuickForm_Rule_MultipleRequired
-?>
diff --git a/main/inc/lib/formvalidator/Rule/Url.php b/main/inc/lib/formvalidator/Rule/Url.php
index 5267aa7f07..5a0ac790df 100644
--- a/main/inc/lib/formvalidator/Rule/Url.php
+++ b/main/inc/lib/formvalidator/Rule/Url.php
@@ -1,4 +1,5 @@
 <?php
+/* For licensing terms, see /license.txt */
 
 /**
  * Abstract base class for QuickForm validation rules
@@ -15,7 +16,7 @@ class HTML_QuickForm_Rule_Url extends HTML_QuickForm_Rule
     /**
      * Validates url
      *
-     * @param string $url    
+     * @param string $url
      * @return boolean  Returns true if valid, false otherwise.
      */
     function validate($url)
diff --git a/main/inc/lib/formvalidator/Rule/Username.php b/main/inc/lib/formvalidator/Rule/Username.php
index 9838c97cec..4280f1de9b 100644
--- a/main/inc/lib/formvalidator/Rule/Username.php
+++ b/main/inc/lib/formvalidator/Rule/Username.php
@@ -1,25 +1,5 @@
 <?php
-/*
-==============================================================================
-	Dokeos - elearning and course management software
-
-	Copyright (c) 2004-2005 Dokeos S.A.
-	Copyright (c) Bart Mollet, Hogeschool Gent
-
-	For a full list of contributors, see "credits.txt".
-	The full license can be read in "license.txt".
-
-	This program is free software; you can redistribute it and/or
-	modify it under the terms of the GNU General Public License
-	as published by the Free Software Foundation; either version 2
-	of the License, or (at your option) any later version.
-
-	See the GNU General Public License for more details.
-
-	Contact address: Dokeos, 44 rue des palais, B-1030 Brussels, Belgium
-	Mail: info@dokeos.com
-==============================================================================
-*/
+/* For licensing terms, see /license.txt */
 
 require_once 'HTML/QuickForm/Rule.php';
 
@@ -34,7 +14,7 @@ class HTML_QuickForm_Rule_Username extends HTML_QuickForm_Rule {
 	 * @return boolean True if username is of the correct format
 	 * @author Modified by Ivan Tcholakov, 15-SEP-2009. The validation rule is served by the UserManager class as of this moment.
 	 */
-	function validate($username, $options) {		
+	function validate($username, $options) {
 		return UserManager::is_username_valid($username);
 	}
 }
diff --git a/main/inc/lib/formvalidator/Rule/UsernameAvailable.php b/main/inc/lib/formvalidator/Rule/UsernameAvailable.php
index 1f6259c4c0..9c21c2afd8 100644
--- a/main/inc/lib/formvalidator/Rule/UsernameAvailable.php
+++ b/main/inc/lib/formvalidator/Rule/UsernameAvailable.php
@@ -1,26 +1,6 @@
 <?php
-// $Id: UsernameAvailable.php 10190 2006-11-24 00:23:20Z pcool $
-/*
-==============================================================================
-	Dokeos - elearning and course management software
+/* For licensing terms, see /license.txt */
 
-	Copyright (c) 2004-2005 Dokeos S.A.
-	Copyright (c) Bart Mollet, Hogeschool Gent
-
-	For a full list of contributors, see "credits.txt".
-	The full license can be read in "license.txt".
-
-	This program is free software; you can redistribute it and/or
-	modify it under the terms of the GNU General Public License
-	as published by the Free Software Foundation; either version 2
-	of the License, or (at your option) any later version.
-
-	See the GNU General Public License for more details.
-
-	Contact address: Dokeos, 44 rue des palais, B-1030 Brussels, Belgium
-	Mail: info@dokeos.com
-==============================================================================
-*/
 require_once 'HTML/QuickForm/Rule.php';
 /**
  * QuickForm rule to check if a username is available
@@ -36,9 +16,9 @@ class HTML_QuickForm_Rule_UsernameAvailable extends HTML_QuickForm_Rule
 	 */
 	function validate($username, $current_username = null) {
 		$user_table = Database::get_main_table(TABLE_MAIN_USER);
-        $username = Database::escape_string($username);        
+        $username = Database::escape_string($username);
         $current_username = Database::escape_string($current_username);
-        
+
 		$sql = "SELECT * FROM $user_table WHERE username = '$username'";
 		if (!is_null($current_username)) {
 			$sql .= " AND username != '$current_username'";