Release version 3.2.0

Author: hungnguyenhp

system/core/CodeIgniter.php

@@ -56,7 +56,7 @@
  * @var	string
  *
  */
-	const CI_VERSION = '3.1.14';
+	const CI_VERSION = '3.2.0';
 
 /*
  * ------------------------------------------------------

system/core/Common.php

@@ -89,6 +89,19 @@ function is_windows()
 
 // ------------------------------------------------------------------------
 
+if ( ! function_exists('is_linux')) {
+	/**
+	 * Check if we're running on a Linux platform
+	 */
+	function is_linux()
+	{
+		$OS = strtoupper(substr(PHP_OS, 0, 3));
+		return $OS !== 'WIN';
+	}
+}
+
+// ------------------------------------------------------------------------
+
 if ( ! function_exists('is_really_writable'))
 {
 	/**