cashharry

hi there, anyone can help me to fix this problem in my website? i get error on my website like this: Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /home/gifts2u/public_html/includes/functions/database.php on line 19 Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/gifts2u/public_html/includes/functions/database.php:19) in /home/gifts2u/public_html/includes/functions/sessions.php on line 102 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/gifts2u/public_html/includes/functions/database.php:19) in /home/gifts2u/public_html/includes/functions/sessions.php on line 102 Warning: Cannot modify header information - headers already sent by (output started at /home/gifts2u/public_html/includes/functions/database.php:19) in /home/gifts2u/public_html/includes/modules/ultimate_seo_urls5/main/validator.phpon line 178 Warning: Cannot modify header information - headers already sent by (output started at /home/gifts2u/public_html/includes/functions/database.php:19) in /home/gifts2u/public_html/includes/modules/ultimate_seo_urls5/main/validator.phpon line 179 Please help, thank you very much