title: Undefined offset PHP error 1
body: <p>I'm getting a Undefined offset error in a PHP function </p>
  
  <p>Error codes</p>
  
  <blockquote>
    <p>PHP Notice:  Undefined offset: 1<br>
    PHP Notice:  Undefined offset: -1</p>
  </blockquote>
  
  <pre><code>function thousandsCurrencyFormat($num) {
    $x = round($num);
    $x_number_format = number_format($x);
    $x_array = explode(',', $x_number_format);
    $x_parts = array('k', 'm', 'b', 't');
    $x_count_parts = count($x_array) - 1;
    $x_display = $x;
    $x_display = $x_array[0] . ((int) $x_array[1][0] !== 0 ? '.' . $x_array[1][0] : '');
    $x_display .= $x_parts[$x_count_parts - 1];
    return $x_display;
  }
  </code></pre>
  
  <p>these are the two lines that I have this error </p>
  
  <pre><code>$x_display = $x_array[0] . ((int) $x_array[1][0] !== 0 ? '.' . $x_array[1][0] : '');
  $x_display .= $x_parts[$x_count_parts - 1];
  </code></pre>
  
  <p>How can I fix this? Appreciate your help</p>