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After processing form data in one of plugin file I need to redirect to some other page. When I used wordpress function or php wp_redirect()/header() it shows me error like "header already send" html already start printing before this file. So How can I redirect after processing form data in plugin file.

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    hook your form processing to an action that runs before the page is printed.
    – Milo
    Nov 26 '14 at 14:32
  • Thanks @Milo. My problem solved by adding a hook. Added my answer what I implemented. Nov 27 '14 at 6:54
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Added hook to process all form values and than redirecting as per process result:

Added below PHP code in theme/functions.php:

function process_form(){
 //code goes here
}
add_action( 'admin_post_appointment_form_process', 'process_form' );

And added/updated below html to form:

<form name="frm1" id="frm1" action="<?php echo home_url()?>/wp-admin/admin-post.php" method="post">
<input type="hidden" name="action" value="appointment_form_process">

Thanks for @Milo comment.

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