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ارور زیر رو چطور رفع کنم؟

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Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /home/**domain**/public_html/wp-includes/wp-db.php on line 1562

Warning: mysql_connect(): Access denied for user 'user'@'localhost' (using password: YES) in /home/**domain**/public_html/wp-includes/wp-db.php on line 1562

Fatal error: Call to undefined function get_bloginfo() in /home/**domain**/public_html/wp-includes/class-wp-locale.php on line 231

با تشکر از انجمن!