WordPress Plugin Development – Headers Already Sent Message

Posted by Prem Tiwari | Updated on

WordPress Plugin Development – Headers Already Sent Message

My guess is you get a PHP error, which generates output before the headers are sent. If you have E_NOTICE enabled, calling $_POST['foo'] may generate a “Notice: undefined variable” error if that variable is not set.

Best practice: never assume anything about GET, POST, COOKIE and REQUEST variables. Always check first using isset() or empty().


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