Unable to store more then 999 elements of an array when submit form in PHP

I unable to store more then 999 elements of an array when submit form in PHP

example:

<form action="/action_page.php">
  <input type="checkbox" name="vehicle" value="Yes">Yes<br>
  <input type="checkbox" name="vehicle" value="No" checked>No<br>
  <input type="checkbox" name="vehicle" value="Yes">Yes<br>
  <input type="checkbox" name="vehicle" value="No" checked>No<br>
  .
  .
  .
  1000 (<input/>)
  <input type="submit" value="Submit">
</form>

Anyone know please help :)