diff --git a/htdocs/admin/system/dolibarr.php b/htdocs/admin/system/dolibarr.php
index 4a55c1a1160..afe5d4d3520 100644
--- a/htdocs/admin/system/dolibarr.php
+++ b/htdocs/admin/system/dolibarr.php
@@ -264,7 +264,7 @@ $daylight = round($c - $b);
 $val = ($a >= 0 ? '+' : '').$a;
 $val .= ' ('.($a == 'unknown' ? 'unknown' : ($a >= 0 ? '+' : '').($a * 3600)).')';
 $val .= '       '.getServerTimeZoneString();
-$val .= '       '.$langs->trans("DaylingSavingTime").': '.($daylight === 'unknown' ? 'unknown' : ($a == $c ?yn($daylight) : yn(0).($daylight ? '      ('.$langs->trans('YesInSummer').')' : '')));
+$val .= '       '.$langs->trans("DaylingSavingTime").': '.(is_null($daylight) ? 'unknown' : ($a == $c ?yn($daylight) : yn(0).($daylight ? '      ('.$langs->trans('YesInSummer').')' : '')));
 print $form->textwithtooltip($val, $txt, 2, 1, img_info(''));
 print '</td></tr>'."\n"; // value defined in http://fr3.php.net/manual/en/timezones.europe.php
 print '<tr class="oddeven"><td>&nbsp; => '.$langs->trans("CurrentHour").'</td><td>'.dol_print_date(dol_now('gmt'), 'dayhour', 'tzserver').'</td></tr>'."\n";
diff --git a/htdocs/blockedlog/class/authority.class.php b/htdocs/blockedlog/class/authority.class.php
index 0b665fedc3e..b3dd9b45f47 100644
--- a/htdocs/blockedlog/class/authority.class.php
+++ b/htdocs/blockedlog/class/authority.class.php
@@ -305,7 +305,7 @@ class BlockedLogAuthority
 
 				$res = getURLContent($url);
 				echo $block->signature.' '.$url.' '.$res['content'].'<br>';
-				if ($res === 'blockalreadyadded' || $res === 'blockadded') {
+				if ($res['content'] === 'blockalreadyadded' || $res['content'] === 'blockadded') {
 					$block->setCertified();
 				} else {
 					$this->error = $langs->trans('ImpossibleToContactAuthority ', $url);
diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index 87d28de8756..0a3c1445745 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -6264,7 +6264,7 @@ class FactureLigne extends CommonInvoiceLine
 			$sql .= ", total_localtax2=".price2num($this->total_localtax2);
 		}
 		$sql .= ", fk_product_fournisseur_price=".(!empty($this->fk_fournprice) ? "'".$this->db->escape($this->fk_fournprice)."'" : "null");
-		$sql .= ", buy_price_ht=".(($this->pa_ht || $this->pa_ht === 0 || $this->pa_ht === '0') ? price2num($this->pa_ht) : "null"); // $this->pa_ht should always be defined (set to 0 or to sell price depending on option)
+		$sql .= ", buy_price_ht=".(($this->pa_ht || (string) $this->pa_ht === '0') ? price2num($this->pa_ht) : "null"); // $this->pa_ht should always be defined (set to 0 or to sell price depending on option)
 		$sql .= ", fk_parent_line=".($this->fk_parent_line > 0 ? $this->fk_parent_line : "null");
 		if (!empty($this->rang)) {
 			$sql .= ", rang=".((int) $this->rang);
diff --git a/htdocs/core/filemanagerdol/connectors/php/connector.lib.php b/htdocs/core/filemanagerdol/connectors/php/connector.lib.php
index 608c2ba4cd6..75c4d1e3e08 100644
--- a/htdocs/core/filemanagerdol/connectors/php/connector.lib.php
+++ b/htdocs/core/filemanagerdol/connectors/php/connector.lib.php
@@ -343,7 +343,8 @@ function FileUpload($resourceType, $currentFolder, $sCommand, $CKEcallback = '')
 
 		include_once DOL_DOCUMENT_ROOT.'/core/lib/images.lib.php';
 		//var_dump($sFileName); var_dump(image_format_supported($sFileName));exit;
-		$isImageValid = (image_format_supported($sFileName) >= 0 ? true : false);
+		$imgsupported = image_format_supported($sFileName);
+		$isImageValid = ($imgsupported >= 0 ? true : false);
 		if (!$isImageValid) {
 			$sErrorNumber = '202';
 		}
@@ -387,7 +388,7 @@ function FileUpload($resourceType, $currentFolder, $sCommand, $CKEcallback = '')
 
 				if (file_exists($sFilePath)) {
 					//previous checks failed, try once again
-					if (isset($isImageValid) && $isImageValid === -1 && IsImageValid($sFilePath, $sExtension) === false) {
+					if (isset($isImageValid) && $imgsupported === -1 && IsImageValid($sFilePath, $sExtension) === false) {
 						dol_syslog("connector.lib.php IsImageValid is ko");
 						@unlink($sFilePath);
 						$sErrorNumber = '202';