diff --git a/dev/tools/test/testtcpdf.php b/dev/tools/test/testtcpdf.php
index ad67bce8af9..e14dae9c2a3 100755
--- a/dev/tools/test/testtcpdf.php
+++ b/dev/tools/test/testtcpdf.php
@@ -101,7 +101,7 @@ $pdf->SetHeaderMargin(PDF_MARGIN_HEADER);
 $pdf->SetFooterMargin(PDF_MARGIN_FOOTER);
 
 //set auto page breaks
-$pdf->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM);
+$pdf->SetAutoPageBreak(true, PDF_MARGIN_BOTTOM);
 
 //set image scale factor
 $pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);
diff --git a/dev/tools/test/testutf.php b/dev/tools/test/testutf.php
index cb83f431b93..c626a92a57d 100644
--- a/dev/tools/test/testutf.php
+++ b/dev/tools/test/testutf.php
@@ -76,7 +76,7 @@ $pdf->SetHeaderMargin(PDF_MARGIN_HEADER);
 $pdf->SetFooterMargin(PDF_MARGIN_FOOTER);
 
 //set auto page breaks
-$pdf->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM);
+$pdf->SetAutoPageBreak(true, PDF_MARGIN_BOTTOM);
 
 //set image scale factor
 //$pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);
diff --git a/test/phpunit/WebservicesInvoicesTest.php b/test/phpunit/WebservicesInvoicesTest.php
index 75cc767b8ee..d2d02bde974 100644
--- a/test/phpunit/WebservicesInvoicesTest.php
+++ b/test/phpunit/WebservicesInvoicesTest.php
@@ -182,12 +182,12 @@ class WebservicesInvoicesTest extends PHPUnit_Framework_TestCase
     	$WS_METHOD  = 'createInvoice';
 
     	$body = array (
-    			"id" => NULL,
-				"ref" => NULL,
+    			"id" => null,
+				"ref" => null,
 				"ref_ext" => "ref-phpunit-2",
 				"thirdparty_id" => self::$socid,
-				"fk_user_author" => NULL,
-				"fk_user_valid" => NULL,
+				"fk_user_author" => null,
+				"fk_user_valid" => null,
 				"date" => "2015-04-19 20:16:53",
 				"date_due" => "",
 				"date_creation" => "",
@@ -201,11 +201,11 @@ class WebservicesInvoicesTest extends PHPUnit_Framework_TestCase
 				"note_private" => "Synchronised from Prestashop",
 				"note_public" => "",
 				"status" => "1",
-				"close_code" => NULL ,
-				"close_note" => NULL,
-				"project_id" => NULL,
+				"close_code" => null ,
+				"close_note" => null,
+				"project_id" => null,
 				"lines" => array(
-					array("id" => NULL,
+					array("id" => null,
 					"type" => 0,
 					"desc" => "Horloge Vinyle Serge",
 					"vat_rate" => 20,
@@ -339,12 +339,12 @@ class WebservicesInvoicesTest extends PHPUnit_Framework_TestCase
 
     	// update status to 2
     	$body = array (
-    		"id" => NULL,
-			"ref" => NULL,
+    		"id" => null,
+			"ref" => null,
 			"ref_ext" => "ref-phpunit-2",
 			"thirdparty_id" => self::$socid,
-			"fk_user_author" => NULL,
-			"fk_user_valid" => NULL,
+			"fk_user_author" => null,
+			"fk_user_valid" => null,
 			"date" => "2015-04-19 20:16:53",
 			"date_due" => "",
 			"date_creation" => "",
@@ -358,12 +358,12 @@ class WebservicesInvoicesTest extends PHPUnit_Framework_TestCase
 			"note_private" => "Synchronised from Prestashop",
 			"note_public" => "",
 			"status" => "2",
-			"close_code" => NULL ,
-			"close_note" => NULL,
-			"project_id" => NULL,
+			"close_code" => null ,
+			"close_note" => null,
+			"project_id" => null,
 			"lines"  => array(
 				array(
-				"id"  => NULL,
+				"id"  => null,
 				"type" => 0,
 				"desc" => "Horloge Vinyle Serge",
 				"vat_rate" => 20,
diff --git a/test/phpunit/WebservicesThirdpartyTest.php b/test/phpunit/WebservicesThirdpartyTest.php
index e0e22125afe..f974622e013 100644
--- a/test/phpunit/WebservicesThirdpartyTest.php
+++ b/test/phpunit/WebservicesThirdpartyTest.php
@@ -161,11 +161,11 @@ class WebservicesThirdpartyTest extends PHPUnit_Framework_TestCase
     			'entity'=>'');
 
     	$body = array (
-    			"id" => NULL,
+    			"id" => null,
     			"ref" => "name",
     			"ref_ext" => "12",
-    			"fk_user_author" => NULL,
-    			"status" => NULL,
+    			"fk_user_author" => null,
+    			"status" => null,
     			"client" => 1,
     			"supplier" => 0,
     			"customer_code" => "CU0901-5678",