Merged 105 - Modern MySQL compatibility

Automattic#105

Author: hj-collab

Diff for: db.php

@@ -435,6 +435,12 @@ public function db_connect( $query = '' ) {
 			if ( ! $this->ex_mysql_select_db( DB_NAME, $this->dbh ) ) {
 				return $this->log_and_bail( 'We were unable to select the database' );
 			}
+			
+			// Set the SQL mode.
+			if ( is_callable( array( $this, 'set_sql_mode' ) ) ) {
+				$this->set_sql_mode();
+			}		
+			
 			if ( ! empty( $this->charset ) ) {
 				$collation_query = "SET NAMES '$this->charset'";
 				if ( ! empty( $this->collate ) ) {
@@ -781,8 +787,13 @@ public function db_connect( $query = '' ) {
 
 		$this->set_charset( $this->dbhs[ $dbhname ], $charset, $collate );
 
-		$this->dbh = $this->dbhs[ $dbhname ]; // needed by $wpdb->_real_escape()
-
+		$this->dbh = $this->dbhs[ $dbhname ]; // needed by $wpdb->_real_escape() and `$wpdb->set_sql_mode()`
+		
+		// Set the SQL mode.
+		if ( is_callable( array( $this, 'set_sql_mode' ) ) ) {
+			$this->set_sql_mode();
+		}
+			
 		$this->last_used_server = compact( 'host', 'user', 'name', 'read', 'write' );
 
 		$this->used_servers[ $dbhname ] = $this->last_used_server;