Simple PHP Supplant Templating for HTML

TemplateTrait.php

<?php
trait TemplateTrait
{
  /**
   * supplant
   * Replaces %tokens% inside a string with an array key/value
   * strings not replaced are removed
   * @param $string :string,
   * @param $array :array
   * @return string
   */
  static public function supplant($string, $array)
  {
    $merged = array_merge(array_fill_keys(array_keys($array), ''), $array);
    $keys = array_map(function ($key) {
      return '%' . $key . '%';
    }, array_keys($merged));

    $return = str_replace($keys, $merged, $string);

    return preg_replace('/%.*?(%)/', '', $return);
  }

  static public function html5_attributes($args)
  {
    $output = '';
    foreach ($args as $key => $value) {
      if (is_string($key)) {
        if (!$value) {
          continue;
        }
        $output .= $key . '="' . htmlspecialchars($value) . '" ';
      } else {
        $output .= $value . ' ';
      }
    }

    return $output;
  }
}