Using the string functions

Code that formats a phone number in two ways

<?php
  $phone = '5545556624';
  $part1 = substr($phone, 0, 3);
  $part2 = substr($phone, 3, 3);
  $part3 = substr($phone, 6);
  $format_1 = $part1 . '-' . $part2 . '-' . $part3;        // 554-555-6624
  $format_2 = '(' . $part1 . ') ' . $part2 . '-' . $part3; // (554) 555-6624
?>

Code that stores each letter in a string on a separate line

<?php
  $vert_str = '';
  $input = 'JAN';
  for ($i = 0; $i < strlen($input); $i++) {
    $vert_str .= substr($input, $i, 1);
    $vert_str .= '<br>';
  }
?>

Output

J
A
N