converting if ($foo != "") to if ($foo)

lib/Cake/Model/Datasource/CakeSession.php

@@ -663,7 +663,7 @@ class CakeSession {
  */
 	public static function renew() {
 		if (session_id()) {
-			if (session_id() != '' || isset($_COOKIE[session_name()])) {
+			if (session_id() || isset($_COOKIE[session_name()])) {
 				setcookie(Configure::read('Session.cookie'), '', time() - 42000, self::$path);
 			}
 			session_regenerate_id(true);

lib/Cake/View/Helper.php

@@ -749,7 +749,7 @@ class Helper extends Object {
  * @return array Array of options with $key set.
  */
 	public function addClass($options = array(), $class = null, $key = 'class') {
-		if (isset($options[$key]) && trim($options[$key]) != '') {
+		if (isset($options[$key]) && trim($options[$key])) {
 			$options[$key] .= ' ' . $class;
 		} else {
 			$options[$key] = $class;

lib/Cake/View/Helper/CacheHelper.php

@@ -148,7 +148,7 @@ class CacheHelper extends AppHelper {
 			$cacheTime = $cacheAction;
 		}
 
-		if ($cacheTime != '' && $cacheTime > 0) {
+		if ($cacheTime && $cacheTime > 0) {
 			$cached = $this->_parseOutput($out);
 			try {
 				$this->_writeFile($cached, $cacheTime, $useCallbacks);