Create wordpress plugin that processes and submit form - php

Question

I am studying how to make a plugin for wordpress, I could make a plugin that adds shortcodes to place on my page and it generates the form.
function mf_container($atts, $content = null) {
$content = do_shortcode($content);
$content = str_replace("<br />","",$content);
$content = str_replace("<p>","",$content);
$content = str_replace("</p>","",$content);
return
"<form action='".plugin_dir_url( __FILE__ )."mult-form-submit.php' method='POST'>" . $content . "</form>";
}
add_shortcode('mult_form','mf_container');
Now precisso make this form is saved in the bank related to the logged in User.
The way that the code above when I click submit it redirects me to a page to "multi-form-submit.php". However when I get on that page I have the following code in it:
<?php if ( ! defined( 'ABSPATH' ) ) die("Not permited");
global $wpdb, $current_user;
$current_user = wp_get_current_user();
however she has not returned since this more in the context of worpress, anyone can do it?

Answer 1

I managed to find a reference that has a light and after many attempts found how to do. That was the reference: link
I am using a plugin structure generated by WORDPRESS PLUGIN BOILERPLATE GENERATOR
In it you should put what started in public view within the function: define_public_hooks(). In this role I had a stretch that was checked that enabled the option to use my plugin:
/** Set build form by shorcodes*/
if($this->get_option('mult_form')){
$this->loader->add_action('init', $plugin_public, 'mult_form');
}
this section redirects me to a function of a class that controls all my public actions:
public function mult_form(){
if(isset ( $_REQUEST['action']) and $_REQUEST['action'] == 'mult_form_submited'){
$this->mult_form_submit();
}
$this->mult_form_shortcode();
}
call it two private functions, where do some treatments that will not show the code, and if all goes well, make a include_once('partials / my_file.php');, ed a flame a different file of course, being first where do all the treatments to generate the shortcode and the second where I will put all my treatments submission form.