Warning: wp-includes/wp-db.php on line 1515
When WordPress 4.5 upgrade, giving this error:
Warning: mysql_connect(): Headers and client library minor version mismatch. Headers:50546 Library:50627 in /home/xxxxxxxx/public_html/wp-includes/wp-db.php on line 1515
This error appears on the website or/and unable to get wp-admin page.
On the login page (wp-admin) this error occurs:
Warning: Cannot modify header information – headers already sent by (output started at /home/xxxxxxxxx/public_html/wp-includes/wp-db.php:1515) in /home/xxxxxxxxxx/public_html/wp-includes/pluggable.php on line 1171
Solution wp-includes/wp-db.php on line 1515 :
In wp-includes, finds this file „wp-includes/wp-db.php” and edit.
Change this line:
$this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
with to…
if ( WP_DEBUG ) {
$this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
} else {
$this->dbh = @mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
}
Do not forget – SAVE.