diff --git a/htdocs/accountancy/class/accountancyexport.class.php b/htdocs/accountancy/class/accountancyexport.class.php
index 3c45315ffa9..9e90db931d0 100644
--- a/htdocs/accountancy/class/accountancyexport.class.php
+++ b/htdocs/accountancy/class/accountancyexport.class.php
@@ -444,14 +444,14 @@ class AccountancyExport
 			print $date.$separator;
 			print $line->piece_num.$separator;
 			print length_accountg($line->numero_compte).$separator;
-			print ''.$separator;
+			print $separator;
 			print $line->label_operation.$separator;
 			print $date.$separator;
 			if ($line->sens == 'D') {
 				print price($line->debit).$separator;
-				print ''.$separator;
+				print $separator;
 			} elseif ($line->sens == 'C') {
-				print ''.$separator;
+				print $separator;
 				print price($line->credit).$separator;
 			}
 			print $line->doc_ref.$separator;
diff --git a/htdocs/admin/delais.php b/htdocs/admin/delais.php
index a3b790525ef..55259ecfff3 100644
--- a/htdocs/admin/delais.php
+++ b/htdocs/admin/delais.php
@@ -325,7 +325,7 @@ if (empty($conf->global->MAIN_DISABLE_METEO) || $conf->global->MAIN_DISABLE_METE
 	if (!empty($conf->global->MAIN_METEO_LEVEL0)) {
 		$level0 = $conf->global->MAIN_METEO_LEVEL0;
 	}
-	$level1 = $offset + 1 * $cursor;
+	$level1 = $offset + $cursor;
 	if (!empty($conf->global->MAIN_METEO_LEVEL1)) {
 		$level1 = $conf->global->MAIN_METEO_LEVEL1;
 	}
diff --git a/htdocs/compta/bank/graph.php b/htdocs/compta/bank/graph.php
index c11e13f1e71..490107e4893 100644
--- a/htdocs/compta/bank/graph.php
+++ b/htdocs/compta/bank/graph.php
@@ -458,7 +458,7 @@ if ($result < 0) {
 			if ($day > ($max + 86400)) {
 				$datas[$i] = ''; // Valeur speciale permettant de ne pas tracer le graph
 			} else {
-				$datas[$i] = 0 + $solde + $subtotal;
+				$datas[$i] = $solde + $subtotal;
 			}
 			$datamin[$i] = $object->min_desired;
 			$dataall[$i] = $object->min_allowed;
diff --git a/htdocs/compta/prelevement/class/bonprelevement.class.php b/htdocs/compta/prelevement/class/bonprelevement.class.php
index 373615ecdfb..554933a2137 100644
--- a/htdocs/compta/prelevement/class/bonprelevement.class.php
+++ b/htdocs/compta/prelevement/class/bonprelevement.class.php
@@ -1866,7 +1866,7 @@ class BonPrelevement extends CommonObject
 			$XML_DEBITOR .= '					<PstlAdr>'.$CrLf;
 			$XML_DEBITOR .= '						<Ctry>'.$row_country_code.'</Ctry>'.$CrLf;
 			$addressline1 = strtr($row_address, array(CHR(13) => ", ", CHR(10) => ""));
-			$addressline2 = strtr($row_zip.(($row_zip && $row_town) ? ' ' : ''.$row_town), array(CHR(13) => ", ", CHR(10) => ""));
+			$addressline2 = strtr($row_zip.(($row_zip && $row_town) ? ' ' : (string) $row_town), array(CHR(13) => ", ", CHR(10) => ""));
 			if (trim($addressline1)) {
 				$XML_DEBITOR .= '						<AdrLine>'.dolEscapeXML(dol_trunc(dol_string_nospecial(dol_string_unaccent($addressline1), ' '), 70, 'right', 'UTF-8', 1)).'</AdrLine>'.$CrLf;
 			}
@@ -1935,7 +1935,7 @@ class BonPrelevement extends CommonObject
 			$XML_CREDITOR .= '					<PstlAdr>'.$CrLf;
 			$XML_CREDITOR .= '						<Ctry>'.$row_country_code.'</Ctry>'.$CrLf;
 			$addressline1 = strtr($row_address, array(CHR(13) => ", ", CHR(10) => ""));
-			$addressline2 = strtr($row_zip.(($row_zip && $row_town) ? ' ' : ''.$row_town), array(CHR(13) => ", ", CHR(10) => ""));
+			$addressline2 = strtr($row_zip.(($row_zip && $row_town) ? ' ' : (string) $row_town), array(CHR(13) => ", ", CHR(10) => ""));
 			if (trim($addressline1)) {
 				$XML_CREDITOR .= '						<AdrLine>'.dolEscapeXML(dol_trunc(dol_string_nospecial(dol_string_unaccent($addressline1), ' '), 70, 'right', 'UTF-8', 1)).'</AdrLine>'.$CrLf;
 			}
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index aafed5900d8..2a59fa4a9f5 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -2072,7 +2072,7 @@ abstract class CommonObject
 
 		$sql .= " WHERE ".$id_field." = ".((int) $id);
 
-		dol_syslog(__METHOD__."", LOG_DEBUG);
+		dol_syslog(__METHOD__, LOG_DEBUG);
 		$resql = $this->db->query($sql);
 		if ($resql) {
 			if ($trigkey) {
diff --git a/htdocs/core/class/doleditor.class.php b/htdocs/core/class/doleditor.class.php
index 67f9cbcbf89..fc86d661296 100644
--- a/htdocs/core/class/doleditor.class.php
+++ b/htdocs/core/class/doleditor.class.php
@@ -183,31 +183,31 @@ class DolEditor
 
 				$htmlencode_force = preg_match('/_encoded$/', $this->toolbarname) ? 'true' : 'false';
 
-				$out .= '<!-- Output ckeditor $disallowAnyContent='.$disallowAnyContent.' toolbarname='.$this->toolbarname.' -->'."\n";
+				$out .= '<!-- Output ckeditor $disallowAnyContent='.dol_escape_htmltag($disallowAnyContent).' toolbarname='.dol_escape_htmltag($this->toolbarname).' -->'."\n";
 				$out .= '<script type="text/javascript">
             			$(document).ready(function () {
 							/* console.log("Run ckeditor"); */
                             /* if (CKEDITOR.loadFullCore) CKEDITOR.loadFullCore(); */
                             /* should be editor=CKEDITOR.replace but what if there is several editors ? */
-                            tmpeditor = CKEDITOR.replace(\''.$this->htmlname.'\',
+                            tmpeditor = CKEDITOR.replace(\''.dol_escape_js($this->htmlname).'\',
             					{
             						/* property:xxx is same than CKEDITOR.config.property = xxx */
             						customConfig: ckeditorConfig,
-									removePlugins: \''.$pluginstodisable.'\',
+									removePlugins: \''.dol_escape_js($pluginstodisable).'\',
             						readOnly: '.($this->readonly ? 'true' : 'false').',
-                            		htmlEncodeOutput:'.$htmlencode_force.',
-            						allowedContent:'.($disallowAnyContent ? 'false' : 'true').',		/* Advanced Content Filter (ACF) is own when allowedContent is false */
+                            		htmlEncodeOutput: '.dol_escape_js($htmlencode_force).',
+            						allowedContent: '.($disallowAnyContent ? 'false' : 'true').',		/* Advanced Content Filter (ACF) is own when allowedContent is false */
             						extraAllowedContent: \'a[target];div{float,display}\',				/* Add the style float and display into div to default other allowed tags */
 									disallowedContent: '.($disallowAnyContent ? '\'\'' : '\'\'').',		/* Tags that are not allowed */
             						fullPage: '.($fullpage ? 'true' : 'false').',						/* if true, the html, header and body tags are kept */
-                            		toolbar: \''.$this->toolbarname.'\',
+                            		toolbar: \''.dol_escape_js($this->toolbarname).'\',
             						toolbarStartupExpanded: '.($this->toolbarstartexpanded ? 'true' : 'false').',
-            						width: '.($this->width ? '\''.$this->width.'\'' : '\'\'').',
-            						height: '.$this->height.',
-                                    skin: \''.$skin.'\',
+            						width: '.($this->width ? '\''.dol_escape_js($this->width).'\'' : '\'\'').',
+            						height: '.dol_escape_js($this->height).',
+                                    skin: \''.dol_escape_js($skin).'\',
                                     '.$scaytautostartup.'
-                                    language: \''.$langs->defaultlang.'\',
-                                    textDirection: \''.$langs->trans("DIRECTION").'\',
+                                    language: \''.dol_escape_js($langs->defaultlang).'\',
+                                    textDirection: \''.dol_escape_js($langs->trans("DIRECTION")).'\',
                                     on : {
                                                 instanceReady : function( ev )
                                                 {
diff --git a/htdocs/core/class/dolgraph.class.php b/htdocs/core/class/dolgraph.class.php
index d6e9d901ed8..196364a84f8 100644
--- a/htdocs/core/class/dolgraph.class.php
+++ b/htdocs/core/class/dolgraph.class.php
@@ -1173,7 +1173,7 @@ class DolGraph
 			} else {
 				$this->stringtoshow .= 'legend: { labels: { boxWidth: 15 }, position: \'' . ($showlegend == 2 ? 'right' : 'top') . '\'';
 				if (!empty($legendMaxLines)) {
-					$this->stringtoshow .= ', maxLines: ' . $legendMaxLines . '';
+					$this->stringtoshow .= ', maxLines: ' . $legendMaxLines;
 				}
 				$this->stringtoshow .= ' }, ' . "\n";
 			}
@@ -1185,7 +1185,7 @@ class DolGraph
 			} else {
 				$this->stringtoshow .= 'legend: { labels: { boxWidth: 15 }, position: \'' . ($showlegend == 2 ? 'right' : 'top') . '\'';
 				if (!empty($legendMaxLines)) {
-					$this->stringtoshow .= ', maxLines: ' . $legendMaxLines . '';
+					$this->stringtoshow .= ', maxLines: ' . $legendMaxLines;
 				}
 				$this->stringtoshow .= ' }, ' . "\n";
 			}
diff --git a/htdocs/core/class/lessc.class.php b/htdocs/core/class/lessc.class.php
index 40c4d21abaa..d697a0eab91 100644
--- a/htdocs/core/class/lessc.class.php
+++ b/htdocs/core/class/lessc.class.php
@@ -2755,7 +2755,7 @@ class lessc_parser
 
 			// media
 			if ($this->literal('@media')) {
-				if (($this->mediaQueryList($mediaQueries) || true)
+				if ($this->mediaQueryList($mediaQueries)
 					&& $this->literal('{')
 					) {
 						$media = $this->pushSpecialBlock("media");
@@ -2769,7 +2769,7 @@ class lessc_parser
 
 			if ($this->literal("@", false) && $this->keyword($dirName)) {
 				if ($this->isDirective($dirName, $this->blockDirectives)) {
-					if (($this->openString("{", $dirValue, null, array(";")) || true) &&
+					if ($this->openString("{", $dirValue, null, array(";")) &&
 						$this->literal("{")
 						) {
 							$dir = $this->pushSpecialBlock("directive");
@@ -2807,7 +2807,7 @@ class lessc_parser
 
 				// opening parametric mixin
 		if ($this->tag($tag, true) && $this->argumentDef($args, $isVararg) &&
-					($this->guards($guards) || true) &&
+					$this->guards($guards) &&
 					$this->literal('{')
 					) {
 				$block = $this->pushBlock($this->fixTags(array($tag)));
@@ -2870,8 +2870,8 @@ class lessc_parser
 
 					// mixin
 		if ($this->mixinTags($tags) &&
-						($this->argumentDef($argv, $isVararg) || true) &&
-						($this->keyword($suffix) || true) && $this->end()
+						$this->argumentDef($argv, $isVararg) &&
+						$this->keyword($suffix) && $this->end()
 						) {
 				$tags = $this->fixTags($tags);
 				$this->append(array('mixin', $tags, $argv, $suffix), $s);
@@ -3165,7 +3165,7 @@ class lessc_parser
 		$expressions = null;
 		$parts = array();
 
-		if (($this->literal("only") && ($only = true) || $this->literal("not") && ($not = true) || true) && $this->keyword($mediaType)) {
+		if ((($this->literal("only") && ($only = true)) || ($this->literal("not") && ($not = true))) && $this->keyword($mediaType)) {
 			$prop = array("mediaType");
 			if (isset($only)) {
 				$prop[] = "only";
diff --git a/htdocs/core/lib/bank.lib.php b/htdocs/core/lib/bank.lib.php
index 736b200bea3..98da571c138 100644
--- a/htdocs/core/lib/bank.lib.php
+++ b/htdocs/core/lib/bank.lib.php
@@ -360,7 +360,7 @@ function checkBanForAccount($account)
 
 		for ($i = 0, $s = 0; $i < 3; $i++) {
 			$code = substr($rib, 7 * $i, 7);
-			$s += (0 + (int) $code) * $coef[$i];
+			$s += ((int) $code) * $coef[$i];
 		}
 		// Soustraction du modulo 97 de $s a 97 pour obtenir la cle
 		$cle_rib = 97 - ($s % 97);
diff --git a/htdocs/dav/dav.class.php b/htdocs/dav/dav.class.php
index 012708c8960..a0375210271 100644
--- a/htdocs/dav/dav.class.php
+++ b/htdocs/dav/dav.class.php
@@ -251,7 +251,7 @@ class CdavLib
 	 */
 	public function getFullCalendarObjects($calendarId, $bCalendarData)
 	{
-		$calid = ($calendarId * 1);
+		$calid = (int) $calendarId;
 		$calevents = array();
 
 		if (!$this->user->rights->agenda->myactions->read) {
diff --git a/htdocs/imports/import.php b/htdocs/imports/import.php
index 9646f0f4900..4ba13d01cf0 100644
--- a/htdocs/imports/import.php
+++ b/htdocs/imports/import.php
@@ -639,7 +639,7 @@ if ($step == 3 && $datatoimport) {
 		$max = $conf->global->MAIN_UPLOAD_DOC; // In Kb
 		$maxphp = @ini_get('upload_max_filesize'); // In unknown
 		if (preg_match('/k$/i', $maxphp)) {
-			$maxphp = (int) substr($maxphp, 0, -1) * 1;
+			$maxphp = (int) substr($maxphp, 0, -1);
 		}
 		if (preg_match('/m$/i', $maxphp)) {
 			$maxphp = (int) substr($maxphp, 0, -1) * 1024;
@@ -652,7 +652,7 @@ if ($step == 3 && $datatoimport) {
 		}
 		$maxphp2 = @ini_get('post_max_size'); // In unknown
 		if (preg_match('/k$/i', $maxphp2)) {
-			$maxphp2 = (int) substr($maxphp2, 0, -1) * 1;
+			$maxphp2 = (int) substr($maxphp2, 0, -1);
 		}
 		if (preg_match('/m$/i', $maxphp2)) {
 			$maxphp2 = (int) substr($maxphp2, 0, -1) * 1024;
diff --git a/htdocs/index.php b/htdocs/index.php
index 15c41e7ff50..7cfd12d4bac 100644
--- a/htdocs/index.php
+++ b/htdocs/index.php
@@ -809,7 +809,7 @@ function getWeatherStatus($totallate)
 	$weather->level = 0;
 	$level0 = $offset;
 	$level0 = getDolGlobalString($used_conf.'0', $level0);
-	$level1 = $offset + 1 * $factor;
+	$level1 = $offset + $factor;
 	$level1 = getDolGlobalString($used_conf.'1', $level1);
 	$level2 = $offset + 2 * $factor;
 	$level2 = getDolGlobalString($used_conf.'2', $level2);
diff --git a/htdocs/opensurvey/exportcsv.php b/htdocs/opensurvey/exportcsv.php
index a8a231787c3..151d748a2fd 100644
--- a/htdocs/opensurvey/exportcsv.php
+++ b/htdocs/opensurvey/exportcsv.php
@@ -68,9 +68,9 @@ $somme = array();
 $input = $langs->trans("Name").";";
 for ($i = 0; $toutsujet[$i]; $i++) {
 	if ($object->format == "D") {
-		$input .= ''.dol_print_date($toutsujet[$i], 'dayhour').';';
+		$input .= dol_print_date($toutsujet[$i], 'dayhour').';';
 	} else {
-		$input .= ''.$toutsujet[$i].';';
+		$input .= $toutsujet[$i].';';
 	}
 }
 
@@ -80,7 +80,7 @@ if (strpos($object->sujet, '@') !== false) {
 	$input .= ";";
 	for ($i = 0; $toutsujet[$i]; $i++) {
 		$heures = explode("@", $toutsujet[$i]);
-		$input .= ''.$heures[1].';';
+		$input .= $heures[1].';';
 	}
 
 	$input .= "\r\n";
diff --git a/htdocs/societe/class/societe.class.php b/htdocs/societe/class/societe.class.php
index dd5ccd7ef0b..3bf780ba106 100644
--- a/htdocs/societe/class/societe.class.php
+++ b/htdocs/societe/class/societe.class.php
@@ -5049,7 +5049,7 @@ class Societe extends CommonObject
 		$sql .= $field." = '".$this->db->escape($value)."'";
 		$sql .= " WHERE rowid = ".((int) $this->id);
 
-		dol_syslog(get_class($this)."::".__FUNCTION__."", LOG_DEBUG);
+		dol_syslog(get_class($this)."::".__FUNCTION__, LOG_DEBUG);
 		$resql = $this->db->query($sql);
 
 		if ($resql) {