diff --git a/src/SettingsWriter.php b/src/SettingsWriter.php
index 6bc51d7..d6fc41c 100644
--- a/src/SettingsWriter.php
+++ b/src/SettingsWriter.php
@@ -81,8 +81,8 @@ class SettingsWriter
 		
 		foreach ($settings as $key => $value)
 		{
-			if (!is_numeric($key)) $key = "'$key'";
-			fwrite( $this->handle, "$indent$key =>" );
+			$stringKey = (is_numeric($key)) ? $key : "'$key'";
+			fwrite( $this->handle, "$indent$stringKey =>" );
 
 			// recursive walk through child arrays
 			if ( is_array( $value ) )
@@ -105,7 +105,7 @@ class SettingsWriter
 				fwrite( $this->handle, " $value" );
 			}
 
-			if ( next($settings) )
+			if ( array_key_last($settings) !== $key )
 			{
 				fwrite( $this->handle, "," );
 			}