diff --git a/htdocs/admin/system/filecheck.php b/htdocs/admin/system/filecheck.php
index 597569abcb1..76202c2df2b 100644
--- a/htdocs/admin/system/filecheck.php
+++ b/htdocs/admin/system/filecheck.php
@@ -87,7 +87,7 @@ if (empty($xmlremote)) $xmlremote = 'https://www.dolibarr.org/files/stable/signa
 
 // Test if remote test is ok
 $enableremotecheck = true;
-if (preg_match('/beta|alpha|rc/i', DOL_VERSION) || ! empty($conf->global->MAIN_ALLOW_INTEGRITY_CHECK_ON_UNSTABLE)) $enableremotecheck=False;
+if (preg_match('/beta|alpha|rc/i', DOL_VERSION) || ! empty($conf->global->MAIN_ALLOW_INTEGRITY_CHECK_ON_UNSTABLE)) $enableremotecheck=false;
 $enableremotecheck = true;
 
 print '<form name="check" action="'.$_SERVER["PHP_SELF"].'">';
diff --git a/htdocs/compta/bank/bankentries_list.php b/htdocs/compta/bank/bankentries_list.php
index 7d5935c189a..3179a6486e9 100644
--- a/htdocs/compta/bank/bankentries_list.php
+++ b/htdocs/compta/bank/bankentries_list.php
@@ -912,7 +912,7 @@ if ($resql)
 	if (! empty($arrayfields['b.conciliated']['checked']))
 	{
         print '<td class="liste_titre" align="center">';
-        print $form->selectyesno('search_conciliated', $search_conciliated, 1, False, 1);
+        print $form->selectyesno('search_conciliated', $search_conciliated, 1, false, 1);
         print '</td>';
 	}
 	print '<td class="liste_titre" align="middle">';
diff --git a/htdocs/compta/facture/class/facture-rec.class.php b/htdocs/compta/facture/class/facture-rec.class.php
index c3ece4a2ee5..1e8997fdae4 100644
--- a/htdocs/compta/facture/class/facture-rec.class.php
+++ b/htdocs/compta/facture/class/facture-rec.class.php
@@ -108,7 +108,7 @@ class FactureRec extends CommonInvoice
 		if (empty($this->frequency))
 		{
 			$this->frequency=0;
-			$this->date_when=NULL;
+			$this->date_when=null;
 		}
 
 
diff --git a/htdocs/core/actions_setmoduleoptions.inc.php b/htdocs/core/actions_setmoduleoptions.inc.php
index eadce1dc74c..03ff1491e49 100644
--- a/htdocs/core/actions_setmoduleoptions.inc.php
+++ b/htdocs/core/actions_setmoduleoptions.inc.php
@@ -31,13 +31,13 @@ if ($action == 'update' && is_array($arrayofparameters))
 {
 	$db->begin();
 
-	$ok=True;
+	$ok=true;
 	foreach($arrayofparameters as $key => $val)
 	{
 		$result=dolibarr_set_const($db,$key,GETPOST($key, 'alpha'),'chaine',0,'',$conf->entity);
 		if ($result < 0)
 		{
-			$ok=False;
+			$ok=false;
 			break;
 		}
 	}
diff --git a/htdocs/core/class/doleditor.class.php b/htdocs/core/class/doleditor.class.php
index aa500ab64df..860d89afea8 100644
--- a/htdocs/core/class/doleditor.class.php
+++ b/htdocs/core/class/doleditor.class.php
@@ -153,7 +153,7 @@ class DolEditor
     {
     	global $conf,$langs;
 
-    	$fullpage=False;
+    	$fullpage=false;
     	if (isset($conf->global->FCKEDITOR_ALLOW_ANY_CONTENT))
     	{
     	   $disallowAnyContent=empty($conf->global->FCKEDITOR_ALLOW_ANY_CONTENT);      // Only predefined list of html tags are allowed or all
diff --git a/htdocs/core/modules/facture/doc/pdf_crabe.modules.php b/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
index 05a832fc716..0e11be1a8fa 100644
--- a/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
+++ b/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
@@ -182,7 +182,7 @@ class pdf_crabe extends ModelePDFFactures
 		$this->localtax2=array();
 		$this->atleastoneratenotnull=0;
 		$this->atleastonediscount=0;
-		$this->situationinvoice=False;
+		$this->situationinvoice=false;
 	}
 
 
diff --git a/htdocs/public/payment/paymentok.php b/htdocs/public/payment/paymentok.php
index 389daafcd15..78cf69d8337 100644
--- a/htdocs/public/payment/paymentok.php
+++ b/htdocs/public/payment/paymentok.php
@@ -222,7 +222,7 @@ if (! empty($conf->paypal->enabled))
 		            $TAXAMT=urldecode($resArray["TAXAMT"]);
 		            $NOTE=urldecode($resArray["NOTE"]);
 
-		            $ispaymentok=True;
+		            $ispaymentok=true;
 		        }
 		        else
 		        {