str_inject.php

<?php

/**
 * Injects a string into an existing string in the designated position.
 * HTML should not be effected, but who knows.
 *
 * @param string $inject
 *   The new string to be injected.
 * @param string $string
 *   The original string to be alter.
 * @param int $pos
 *   The word posion to inject the new string at. Zero is ahead of the
 *   original string.
 * @return string
 *   Returns the new injected string.
 */
function str_inject($inject, $string, $pos) {
  $string = explode (' ', $string);
  array_splice($string, $pos, 0, $inject);
  return implode(' ', $string);
}