'Wordpress plugin & PHP choose selected element from a drop down menu

I have these 2 functions of the same class. I need to retrive the selected element from the drop down menu but I can not. What am I doing wrong??

    global $wpdb;

    $results =$wpdb -> get_col("SELECT `user_login` FROM `wp_users`");

    echo'<form method="post">
    <select name="employees" id="employees">';

    foreach ($results as $value) {
        echo'<option value="' .$value . '" ">  ' .$value. '</option>"';
     }
 
 '</select>';



echo '<input type="text" class="regular-text" name="first_name" value="' .var_dump($_POST). '" placeholder="Write your First Name">';
echo '<input type="text" class="regular-text" name="first_name" value="' .var_dump($_POST['employees']). '" placeholder="Write your First Name">';
echo '<input type="text" class="regular-text" name="first_name" value="' .print_r($_POST['employees']). '" placeholder="Write your First Name">';
phpwordpress


Solution 1:[1]

I had this code on the pagename.php which calls the callback class where was located my dropdownlis.

<form method="post" action="options.php">
            <?php 
                settings_fields( 'alecaddd_options_group' );
                do_settings_sections( 'alecaddd_plugin' );
                submit_button();
            ?>
        </form>

After removing the action fild everything worked great

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Alduxo

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