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Prevent Page Refreshing

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Hello. What do you think would be the best method of stopping some from refreshing a page with POST data? Lately, some people have been refreshing pages with POST, so it keeps creating rows and stuff.I've been stressed to Heck trying to figure this out. Some people suggested using header (location: ''); However, it only displays an error message:

Warning: Cannot modify header information - headers already sent by (output started at /usr/export/www/vhosts/funnetwork/hosting/tpmrpg/top2.html:148) in /usr/export/www/vhosts/funnetwork/hosting/tpmrpg/promo.php on line 44


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