diff --git a/mssql.php b/mssql.php
index 2c5b054..0cd99e5 100644
--- a/mssql.php
+++ b/mssql.php
@@ -63,9 +63,9 @@ function connect($config) {
 		
 		if ($this->db = mssql_pconnect($config['server'], $config['username'], $config['password'])) {
 		    mssql_select_db($config['database']);
-		    return TRUE;
+		    return true;
 	    }
-		return FALSE;
+		return false;
     }
 
     /**
@@ -126,7 +126,7 @@ function getDatabase() {
      * @return str[] The primary key field names
      */
     function getPrimaryKeys($table) {
-      $primary = NULL;
+      $primary = null;
       $query = sprintf("SELECT [name]
   FROM syscolumns 
 	WHERE [id] IN (SELECT [id] 
diff --git a/mysql.php b/mysql.php
index 498b8cb..c6dfa10 100644
--- a/mysql.php
+++ b/mysql.php
@@ -45,10 +45,10 @@ function connect($config) {
 			$config['password']
 		)) {
 			if ($this->select_db($config['database'])) {
-				return TRUE;
+				return true;
 			}
         }
-        return FALSE;
+        return false;
     }
 
     /**
@@ -63,9 +63,9 @@ function close() {
      */
     function select_db($database) {
         if (mysql_select_db($database, $this->db)) {
-            return TRUE;
+            return true;
         }
-        return FALSE;
+        return false;
     }
     
     /**
@@ -111,7 +111,7 @@ function getDatabase() {
      */
     function getPrimaryKeys($table) {
         $resource = $this->getColumns($table);
-        $primary = NULL;
+        $primary = null;
         if ($resource) {
             while ($row = $this->row($resource)) {
                 if ($row['Key'] == 'PRI') {
diff --git a/phprestsql.php b/phprestsql.php
index 382ba49..4850e40 100644
--- a/phprestsql.php
+++ b/phprestsql.php
@@ -46,25 +46,25 @@ class PHPRestSQL {
      * The HTTP request data sent (if any).
      * @var str
      */
-    var $requestData = NULL;
+    var $requestData = null;
 	
 	/**
 	 * The URL extension stripped off of the request URL
 	 * @var str
 	 */
-	var $extension = NULL;
+	var $extension = null;
 	
     /**
      * The database table to query.
      * @var str
      */
-    var $table = NULL;
+    var $table = null;
 
     /**
      * The primary key of the database row to query.
      * @var str[]
      */
-    var $uid = NULL;
+    var $uid = null;
     
     /**
      * Array of strings to convert into the HTTP response.
@@ -75,7 +75,7 @@ class PHPRestSQL {
     /**
      * Type of display, database, table or row.
      */
-    var $display = NULL;
+    var $display = null;
     
     /**
      * Constructor. Parses the configuration file "phprestsql.ini", grabs any request data sent, records the HTTP
@@ -83,7 +83,7 @@ class PHPRestSQL {
      * @param str iniFile Configuration file to use
      */
     function PHPRestSQL($iniFile = 'phprestsql.ini') {
-        $this->config = parse_ini_file($iniFile, TRUE);
+        $this->config = parse_ini_file($iniFile, true);
         
         if (isset($_SERVER['REQUEST_URI']) && isset($_SERVER['REQUEST_METHOD'])) {
         
@@ -101,7 +101,7 @@ function PHPRestSQL($iniFile = 'phprestsql.ini') {
 			
 			$lastPart = array_pop($urlParts);
 			$dotPosition = strpos($lastPart, '.');
-			if ($dotPosition !== FALSE) {
+			if ($dotPosition !== false) {
 				$this->extension = substr($lastPart, $dotPosition + 1);
 				$lastPart = substr($lastPart, 0, $dotPosition);
 			}
@@ -519,7 +519,7 @@ function generateResponseData() {
     /**
      * Send a HTTP 201 response header.
      */
-    function created($url = FALSE) {
+    function created($url = false) {
         header('HTTP/1.0 201 Created');
         if ($url) {
             header('Location: '.$url);   
diff --git a/postgresql.php b/postgresql.php
index 0f4574d..9a38e54 100644
--- a/postgresql.php
+++ b/postgresql.php
@@ -62,9 +62,9 @@ function connect($config) {
 		);
 		
         if ($this->db = pg_pconnect($connString)) {
-            return TRUE;
+            return true;
 	    }
-		return FALSE;
+		return false;
     }
 
     /**
@@ -126,7 +126,7 @@ function getDatabase() {
      */
     function getPrimaryKeys($table) {
         $i = 0;
-        $primary = NULL;
+        $primary = null;
         do {
 		    $query = sprintf('SELECT pg_attribute.attname
 		        FROM pg_class, pg_attribute, pg_index