html - Unable to capture the form select value , php -

after reading number of posts on here, on how capture select values in html form, understand principle cant seem execute flawlessly in code below.
$selected_val isn't being appended. perhaps empty? missing? in advance.

desired result:
test@test.com a-user ,

current result:
test@test.com ,

here how html form looks:

<form method="post" class="subscription-form form-inline  id="subscribe" role="form">  <h4 class="subscription-success"><i class="icon_check"></i> thank requesting... </h4> <h4 class="subscription-error">something wrong!</h4>  <select name="usertype" class="form-control input-box">     <option selected value="a-user">i'm user</option>     <option value="b-user">i'm b user</option>     <option value="c-user">i'm c user</option> </select> <input type="email" name="email" id="subscriber-email" placeholder="your email" class="form-control input-box">  <button type="submit" name="submit" id="subscribe-button" class="btn btn-default standard-button">submit</button>  </form> 

here php:

<?php     if ( isset($_post['email']) && filter_var($_post['email'], filter_validate_email) ) {      $selected_val = $_post['usertype'];  // storing selected value in variable      $e_mail = $_post['email'] . " " . $selected_val . " ," . "\n"; file_put_contents('email-list.txt', $e_mail, file_append | lock_ex); }  ?> 

your form missing method attribute

post method should there

<form action="your.php" method="post">