diff --git a/system/core/Output.php b/system/core/Output.php
index 5173f7e..10332f0 100644
--- a/system/core/Output.php
+++ b/system/core/Output.php
@@ -701,7 +701,7 @@
 		else
 		{
 			header('Pragma: public');
-			header('Cache-Control: max-age=' . $max_age . ', public');
+			header('Cache-Control: max-age='.$max_age.', public');
 			header('Expires: '.gmdate('D, d M Y H:i:s', $expiration).' GMT');
 			header('Last-modified: '.gmdate('D, d M Y H:i:s', $last_modified).' GMT');
 		}
diff --git a/system/database/drivers/oci8/oci8_driver.php b/system/database/drivers/oci8/oci8_driver.php
index 020a3a4..d75ed28 100644
--- a/system/database/drivers/oci8/oci8_driver.php
+++ b/system/database/drivers/oci8/oci8_driver.php
@@ -344,7 +344,7 @@
 				$have_cursor = TRUE;
 			}
 		}
-		$sql = trim($sql, ',') . '); END;';
+		$sql = trim($sql, ',').'); END;';
 
 		$this->stmt_id = FALSE;
 		$this->_set_stmt_id($sql);
diff --git a/system/libraries/Ftp.php b/system/libraries/Ftp.php
index dc6bbd2..2489f49 100644
--- a/system/libraries/Ftp.php
+++ b/system/libraries/Ftp.php
@@ -392,7 +392,7 @@
 		{
 			if ($this->debug === TRUE)
 			{
-				$this->_error('ftp_unable_to_' . ($move === FALSE ? 'rename' : 'move'));
+				$this->_error('ftp_unable_to_'.($move === FALSE ? 'rename' : 'move'));
 			}
 			return FALSE;
 		}
diff --git a/system/libraries/Xmlrpc.php b/system/libraries/Xmlrpc.php
index 16c5b0e..fe9781b 100644
--- a/system/libraries/Xmlrpc.php
+++ b/system/libraries/Xmlrpc.php
@@ -1684,7 +1684,7 @@
 	{
 		if ($this->mytype !== 0)
 		{
-			echo '<strong>XML_RPC_Values</strong>: already initialized as a [' . $this->kindOf() . ']<br />';
+			echo '<strong>XML_RPC_Values</strong>: already initialized as a ['.$this->kindOf().']<br />';
 			return 0;
 		}
 
@@ -1705,7 +1705,7 @@
 	{
 		if ($this->mytype !== 0)
 		{
-			echo '<strong>XML_RPC_Values</strong>: already initialized as a [' . $this->kindOf() . ']<br />';
+			echo '<strong>XML_RPC_Values</strong>: already initialized as a ['.$this->kindOf().']<br />';
 			return 0;
 		}
 		$this->mytype = $this->xmlrpcTypes['struct'];