There are some great resources on how best to add a form to your plugin. Notably, there’s this from Tutsplus (They write very solid tutorials; Love them):–net-2668

In it, Cristian proposes that you use this for your form’s action

<form action="<?php echo str_replace( '%7E', '~', $_SERVER['REQUEST_URI']); ?>" method="post" name="oscimp_form"><input name="oscimp_hidden" type="hidden" value="Y" /></form>
and use this to handle the submission:
if($_POST['oscimp_hidden'] == 'Y') {
//Form data sent
} else {
//Normal page display
This is fine if you aren’t using OOP in your plugin; if you are (and you really should be IMHO), there are a number of ways to go about it. One is to point the action to a plugin menu item and then in the handler function, check whether the request came in from your form. *stop talking already, give us the code!!*
One tiny other thing: Using REQUEST_URI for your action doesn’t cater for the fact that it could contain several other query arguments which you’d be passing on
Ok, now, the code: Point your form’s action to a plugin menu page:
<form action="<?php echo admin_url('admin.php?page=my-plugin-page');?>" method="POST">
<!--The rest of your input fields-->
<input type="submit" value="Submit" name="my-submit" />
NB: I found that my form defaults to GET hence the need to explicitly define method=”POST”
Then to handle the form submission, put this in the constructor of the class that’s going to handle your data:
add_menu_page($page_title, $menu_title, $capability, "my-plugin-page", array($this,handle_form_submission));
public function handle_form_submission(){
 if ( isset($_POST['my-submit']) ) {
            //Handle your form's data
   } else{ 
     //Output the my-plugin page HTML
Note that you don’t necessarily have to define a new plugin menu page just to handle your form submission; you can re-use one you’ve already defined-all you need is to add the if ( isset($_POST[‘my-submit’]) )  to pick-up your data and proceed with processing.
Don’t forget to add a nonce to your form.

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