I know in PHP I can just put action equal to random.php file and process the data there, but how in wordpress can I use already existing page with a custom template to submit a form to, so that after submitting a form on one page, user will be redirected to another page in wordpress with all his inputted credentials still available?

<form action="<?php echo esc_url( admin_url('admin-post.php') ); ?>" method="post">
<input type="hidden" name="action" value="your_action_name">

Add these in your form. Where admin-post.php will process your form. In that case based on the value of your_action_name that is provided by you, an action hook will get involved. Say for example if you add a hook like the following in functions.php of your theme or in your plugin

add_action( 'admin_post_nopriv_your_action_name', 'your_function_to_process_form' );

then for non logged in user

function your_function_to_process_form(){
// process your form here

will be called. From there you can process your form. For logged in user you need to rename your action to admin_post_your_action_name from admin_post_nopriv_your_action_name. Remember admin_post_ or admin_post_nopriv_ are available in admin-post.php to do_action appropriate action. Whatever you append at the end of admin_post_nopriv_ or admin_post_ will formulate a action hook. That needs to implemented by add_action(). If you pass contactform as a hidden action then your action hook will be either admin_post_nopriv_contactform or admin_post_contactform or both.

  • Wow, many steps. I understand everything in your explanation, except for one thing. So if say, after the form submission I want to take user to a new page with orher layout, how do I do that? Because like I said, in plain php I put another file name in action and just write html structure in that new file. Here you say put admin-post.php and specify hooks for functions.php. But where do I put a new page url with new html and styles for user to be redurected to? – Limpuls Nov 12 '18 at 23:26
  • you may use wp_redirect( 'your location' );. Put it at the end of your function after you have processed your form. – user119247 Nov 12 '18 at 23:29
  • Inside functions.php? – Limpuls Nov 12 '18 at 23:30
  • function your_function_to_process_form(){ //do processing your form then wp_redirect( 'your location' ); } – user119247 Nov 12 '18 at 23:31
  • Thanks. I just wonder why exactly it has to be done this way. Only submitting to admin-post.php. I wonder why to this and not something else. Is that just the way wordpress is and handles custom forms? Would love to read any resources on this if you have. – Limpuls Nov 12 '18 at 23:34

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