Handle localized floats in $wpdb->prepare(). props kurtpayne. fixes #19861.

git-svn-id: http://core.svn.wordpress.org/trunk@21161 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/wp-db.php

@@ -850,6 +850,7 @@ class wpdb {
 	 * @return void
 	 */
 	function escape_by_ref( &$string ) {
+		if ( ! is_float( $string ) )
 			$string = $this->_real_escape( $string );
 	}
 
@@ -901,6 +902,7 @@ class wpdb {
 			$args = $args[0];
 		$query = str_replace( "'%s'", '%s', $query ); // in case someone mistakenly already singlequoted it
 		$query = str_replace( '"%s"', '%s', $query ); // doublequote unquoting
+		$query = str_replace( '%f' , '%F', $query ); // Force floats to be locale unaware		
 		$query = preg_replace( '|(?<!%)%s|', "'%s'", $query ); // quote the strings, avoiding escaped strings like %%s
 		array_walk( $args, array( &$this, 'escape_by_ref' ) );
 		return @vsprintf( $query, $args );