diff --git a/htdocs/admin/barcode.php b/htdocs/admin/barcode.php
index 4e0c683a73f..519f2b42938 100644
--- a/htdocs/admin/barcode.php
+++ b/htdocs/admin/barcode.php
@@ -306,7 +306,7 @@ if (! empty($conf->product->enabled))
 	print '<tr class="oddeven">';
 	print '<td>'.$langs->trans("SetDefaultBarcodeTypeProducts").'</td>';
 	print '<td width="60" align="right">';
-	$formbarcode->select_barcode_type($conf->global->PRODUIT_DEFAULT_BARCODE_TYPE,"PRODUIT_DEFAULT_BARCODE_TYPE",1);
+	print $formbarcode->selectBarcodeType($conf->global->PRODUIT_DEFAULT_BARCODE_TYPE, "PRODUIT_DEFAULT_BARCODE_TYPE", 1);
 	print '</td></tr>';
 }
 
@@ -317,7 +317,7 @@ if (! empty($conf->societe->enabled))
 	print '<tr class="oddeven">';
 	print '<td>'.$langs->trans("SetDefaultBarcodeTypeThirdParties").'</td>';
 	print '<td width="60" align="right">';
-	print $formbarcode->select_barcode_type($conf->global->GENBARCODE_BARCODETYPE_THIRDPARTY,"GENBARCODE_BARCODETYPE_THIRDPARTY",1);
+	print $formbarcode->selectBarcodeType($conf->global->GENBARCODE_BARCODETYPE_THIRDPARTY, "GENBARCODE_BARCODETYPE_THIRDPARTY", 1);
 	print '</td></tr>';
 }
 
diff --git a/htdocs/barcode/printsheet.php b/htdocs/barcode/printsheet.php
index 6dd578993ca..a1f3632fd2f 100644
--- a/htdocs/barcode/printsheet.php
+++ b/htdocs/barcode/printsheet.php
@@ -178,19 +178,19 @@ if ($action == 'builddoc')
 	{
 		// List of values to scan for a replacement
 		$substitutionarray = array (
-		'%LOGIN%'=>$user->login,
-		'%COMPANY%'=>$mysoc->name,
-		'%ADDRESS%'=>$mysoc->address,
-		'%ZIP%'=>$mysoc->zip,
-		'%TOWN%'=>$mysoc->town,
-		'%COUNTRY%'=>$mysoc->country,
-		'%COUNTRY_CODE%'=>$mysoc->country_code,
-		'%EMAIL%'=>$mysoc->email,
-		'%YEAR%'=>$year,
-		'%MONTH%'=>$month,
-		'%DAY%'=>$day,
-		'%DOL_MAIN_URL_ROOT%'=>DOL_MAIN_URL_ROOT,
-		'%SERVER%'=>"http://".$_SERVER["SERVER_NAME"]."/"
+		    '%LOGIN%' => $user->login,
+		    '%COMPANY%' => $mysoc->name,
+		    '%ADDRESS%' => $mysoc->address,
+		    '%ZIP%' => $mysoc->zip,
+		    '%TOWN%' => $mysoc->town,
+		    '%COUNTRY%' => $mysoc->country,
+		    '%COUNTRY_CODE%' => $mysoc->country_code,
+		    '%EMAIL%' => $mysoc->email,
+		    '%YEAR%' => $year,
+		    '%MONTH%' => $month,
+		    '%DAY%' => $day,
+		    '%DOL_MAIN_URL_ROOT%' => DOL_MAIN_URL_ROOT,
+		    '%SERVER%' => "http://".$_SERVER["SERVER_NAME"]."/",
 		);
 		complete_substitutions_array($substitutionarray, $langs);
 
@@ -416,7 +416,7 @@ print $langs->trans("BarcodeType").' &nbsp; ';
 print '</div><div class="tagtd" style="overflow: hidden; white-space: nowrap; max-width: 300px;">';
 require_once DOL_DOCUMENT_ROOT.'/core/class/html.formbarcode.class.php';
 $formbarcode = new FormBarCode($db);
-$formbarcode->select_barcode_type($fk_barcode_type, 'fk_barcode_type', 1);
+print $formbarcode->selectBarcodeType($fk_barcode_type, 'fk_barcode_type', 1);
 print '</div></div>';
 
 // Barcode value
diff --git a/htdocs/core/class/html.formbarcode.class.php b/htdocs/core/class/html.formbarcode.class.php
index 6780f01735a..7b0f7bd06fe 100644
--- a/htdocs/core/class/html.formbarcode.class.php
+++ b/htdocs/core/class/html.formbarcode.class.php
@@ -1,21 +1,22 @@
 <?php
-/* Copyright (C) 2007-2012	Regis Houssin		<regis.houssin@capnetworks.com>
- * Copyright (C) 2008-2012	Laurent Destailleur	<eldy@users.sourceforge.net>
-*
-* 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 3 of the License, or
-* (at your option) any later version.
-*
-* This program is distributed in the hope that it will be useful,
-* but WITHOUT ANY WARRANTY; without even the implied warranty of
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-* GNU General Public License for more details.
-*
-* You should have received a copy of the GNU General Public License
-* along with this program. If not, see <http://www.gnu.org/licenses/>.
-*
-*/
+/* Copyright (C) 2007-2012  Regis Houssin           <regis.houssin@capnetworks.com>
+ * Copyright (C) 2008-2012  Laurent Destailleur     <eldy@users.sourceforge.net>
+ * Copyright (C) 2018       Frédéric France         <frederic.france@netlogic.fr>
+ *
+ * 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
 
 /**
  *      \file       htdocs/core/class/html.formbarcode.class.php
@@ -32,11 +33,11 @@ class FormBarCode
      * @var DoliDB Database handler.
      */
     public $db;
-    
+
     /**
-	 * @var string Error code (or message)
-	 */
-	public $error='';
+     * @var string Error code (or message)
+     */
+    public $error='';
 
 
     /**
@@ -104,17 +105,33 @@ class FormBarCode
     }
 
     /**
-     *	Return form to select type of barcode
+     *  Print form to select type of barcode
      *
      *	@param	int		$selected          Id code pre-selected
      *  @param	string	$htmlname          Name of HTML select field
      *  @param  int		$useempty          Affiche valeur vide dans liste
      *  @return	void
+     *  @deprecated
      */
     // phpcs:ignore PEAR.NamingConventions.ValidFunctionName.NotCamelCaps
-    function select_barcode_type($selected='',$htmlname='barcodetype_id',$useempty=0)
+    function select_barcode_type($selected='', $htmlname='barcodetype_id', $useempty=0)
     {
-        global $langs,$conf;
+        print $this->selectBarcodeType($selected, $htmlname, $useempty);
+    }
+
+    /**
+     *  Return html form to select type of barcode
+     *
+     *  @param  int     $selected          Id code pre-selected
+     *  @param  string  $htmlname          Name of HTML select field
+     *  @param  int     $useempty          Display empty value in select
+     *  @return string
+     */
+    function selectBarcodeType($selected='', $htmlname='barcodetype_id', $useempty=0)
+    {
+        global $langs, $conf;
+
+        $out = '';
 
         $sql = "SELECT rowid, code, libelle";
         $sql.= " FROM ".MAIN_DB_PREFIX."c_barcode_type";
@@ -123,44 +140,37 @@ class FormBarCode
         $sql.= " ORDER BY code";
 
         $result = $this->db->query($sql);
-        if ($result)
-        {
+        if ($result) {
             $num = $this->db->num_rows($result);
             $i = 0;
 
-            if ($useempty && $num > 0)
-            {
-                print '<select class="flat minwidth75imp" name="'.$htmlname.'" id="select_'.$htmlname.'">';
-                print '<option value="0">&nbsp;</option>';
-            }
-            else
-            {
+            if ($useempty && $num > 0) {
+                $out .= '<select class="flat minwidth75imp" name="' . $htmlname . '" id="select_' . $htmlname . '">';
+                $out .= '<option value="0">&nbsp;</option>';
+            } else {
                 $langs->load("errors");
-                print '<select disabled class="flat minwidth75imp" name="'.$htmlname.'" id="select_'.$htmlname.'">';
-                print '<option value="0" selected>'.$langs->trans('ErrorNoActivatedBarcode').'</option>';
+                $out .= '<select disabled class="flat minwidth75imp" name="' . $htmlname . '" id="select_' . $htmlname . '">';
+                $out .= '<option value="0" selected>' . $langs->trans('ErrorNoActivatedBarcode') . '</option>';
             }
 
-            while ($i < $num)
-            {
+            while ($i < $num) {
                 $obj = $this->db->fetch_object($result);
-                if ($selected == $obj->rowid)
-                {
-                    print '<option value="'.$obj->rowid.'" selected>';
+                if ($selected == $obj->rowid) {
+                    $out .= '<option value="' . $obj->rowid . '" selected>';
+                } else {
+                    $out .= '<option value="' . $obj->rowid . '">';
                 }
-                else
-                {
-                    print '<option value="'.$obj->rowid.'">';
-                }
-                print $obj->libelle;
-                print '</option>';
+                $out .= $obj->libelle;
+                $out .= '</option>';
                 $i++;
             }
-            print "</select>";
-            print ajax_combobox("select_".$htmlname);
+            $out .= "</select>";
+            $out .= ajax_combobox("select_".$htmlname);
         }
         else {
             dol_print_error($this->db);
         }
+        return $out;
     }
 
     /**
@@ -182,7 +192,7 @@ class FormBarCode
             print '<input type="hidden" name="action" value="set'.$htmlname.'">';
             print '<table class="nobordernopadding" cellpadding="0" cellspacing="0">';
             print '<tr><td>';
-            $this->select_barcode_type($selected, $htmlname, 1);
+            print $this->selectBarcodeType($selected, $htmlname, 1);
             print '</td>';
             print '<td align="left"><input type="submit" class="button" value="'.$langs->trans("Modify").'">';
             print '</td></tr></table></form>';
diff --git a/htdocs/product/card.php b/htdocs/product/card.php
index 52815c1303d..a252a1ccafa 100644
--- a/htdocs/product/card.php
+++ b/htdocs/product/card.php
@@ -977,7 +977,7 @@ else
 	        }
 	        require_once DOL_DOCUMENT_ROOT.'/core/class/html.formbarcode.class.php';
             $formbarcode = new FormBarCode($db);
-	        print $formbarcode->select_barcode_type($fk_barcode_type, 'fk_barcode_type', 1);
+            print $formbarcode->selectBarcodeType($fk_barcode_type, 'fk_barcode_type', 1);
 	        print '</td><td>'.$langs->trans("BarcodeValue").'</td><td>';
 	        $tmpcode=isset($_POST['barcode'])?GETPOST('barcode'):$object->barcode;
 	        if (empty($tmpcode) && ! empty($modBarCodeProduct->code_auto)) $tmpcode=$modBarCodeProduct->getNextValue($object,$type);
@@ -1343,7 +1343,7 @@ else
 		        }
 		        require_once DOL_DOCUMENT_ROOT.'/core/class/html.formbarcode.class.php';
 	            $formbarcode = new FormBarCode($db);
-		        print $formbarcode->select_barcode_type($fk_barcode_type, 'fk_barcode_type', 1);
+                print $formbarcode->selectBarcodeType($fk_barcode_type, 'fk_barcode_type', 1);
 		        print '</td><td>'.$langs->trans("BarcodeValue").'</td><td>';
 		        $tmpcode=isset($_POST['barcode'])?GETPOST('barcode'):$object->barcode;
 		        if (empty($tmpcode) && ! empty($modBarCodeProduct->code_auto)) $tmpcode=$modBarCodeProduct->getNextValue($object,$type);