How to create a php page to collect information from a html page

Question

Here I’ve added a this hidden input <input type="hidden" name="action" value="your_form_task"> and updated the post URI to <?php echo esc_url( admin_url('admin-post.php') ); ?>.

Here is the updated form-

<form method="get" action="<?php echo esc_url( admin_url('admin-post.php') ); ?>" name="emailForm" onsubmit="return validate()">
    <div class="form-group">
        <label for="name">Name<span id="req">*</span></label><br>
        <input type="text" class="form-control" id="name" name="name" placeholder="Quantum Management" value="">
    </div>

    <div class="form-group">
        <label for="tel">Phone Number<span id="reqTel">*</span></label><br>
        <input type="text" class="form-control" id="tel" name="tel" placeholder="(999) 123-4567" value=""  >
    </div>

    <div class="form-group">
        <label for="email">Email<span id="reqEmail">*</span></label><br>
        <input type="text" class="form-control" id="email" name="email" placeholder="[email protected]" value="" >
    </div>

    <div class="form-group">
        <label for="questions">Questions<span id="reqQuest">*</span></label><br>
        <textarea class="form-control" rows="7" cols="8" id="questions" name="questions" placeholder="Questions" ></textarea>
    </div>

    <div class="form-group">
        <button type="submit" class="btn btn-default" name="submit" value="yes">Submit</button>
    </div>
    <input type="hidden" name="action" value="your_form_task">
</form>

Note that it is very important. Now here is the function where you can put your logics to handle form data-

function the_dramatist_form_post_to_admin() {
    /**
     * At this point, $_GET/$_POST variable are available
     *
     * We can do our normal processing here
     */

    // Sanitize the POST field
    // Generate email content
    // Send to appropriate email
    // Or do whatever you want to do.
}
add_action( 'admin_post_nopriv_your_form_task', 'the_dramatist_form_post_to_admin' );
add_action( 'admin_post_your_form_task', 'the_dramatist_form_post_to_admin' );

Look here is another important thing, after admin_post_nopriv_ and admin_post_ I’ve glued the your_form_task string what we’ve declared as hidden input value in the form with input name action. It’s actually pointing the form to be submitted in this function. And admin_post_nopriv_{$action} fires on a non-authenticated admin post request for the given action where admin_post_{$action} fires on an authenticated admin post request for the given action. Here $action is your_form_task. Hope that helps.

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