When entering information from a form on a site in mysql, an extra entry appears, how to remove it?

Question

PHP

there is a submission form

<form method="post" class="form">
    <div class="pr-title">
      Добавить участок
      <span class="close" onclick="setVisibility('pre', 'none')">&times;</span>
    </div>
    <div style="text-align: center;">
      <p>
        <label>Участковая избирательная комиссия №</label>
        <input type="text" class="input1" name="id">
      </p>
      <p>
        <label>Место нахождения</label></p>
      <p>
        <input type="text" class="input2" name="name"></p>
      <p><label>Адрес</label></p>
      <p>
      <input type="text" class="input3" name="town" placeholder="город">
      <input type="text" class="input4" name="street" placeholder="улица">
      <input type="text" class="input5" name="house" placeholder="дом">
      <p><input class="subpre" name="sub" type="submit" value="Добавить"/></p>
    </div>
  </form>

there is a php input with a request

<?php

    @$id = @$_POST['id'];
    @$name = @$_POST['name'];
    @$town = @$_POST['town'];
    @$street = @$_POST['street'];
    @$house = @$_POST['house'];

    
    @$spec = mysqli_fetch_assoc(@$spec);
    

    $mysqli->query("INSERT INTO `precinct` (`id`, `name`, `town`, `street`, `house`) VALUES ('$id', '$name', '$town','$street', '$house')");

  ?>

all information is entered, but 0 also appears, although I did not enter it in any way. what could be the problem?

Answer 1

I suspect that your form handler is located in the "controller" of the page with the form, and every time you open it, you write empty data, from which there was no POST request.
They get smothered by suppressing errors, and then they run to the forums for help -_-

Answer 2

Before inserting data, they must be checked (including for non-emptiness for required fields). In your case, it is also easy to perform SQL injections.