String.php

1. 8.x drupal/core/lib/Drupal/Component/Utility/String.php
2. 8.x drupal/core/lib/Drupal/Core/TypedData/Type/String.php
3. 8.x drupal/core/vendor/phpunit/phpunit/PHPUnit/Util/String.php
4. 8.x drupal/core/vendor/twig/twig/lib/Twig/Loader/String.php
5. 8.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/argument/String.php
6. 8.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php

<?php

/**
 * PHPUnit
 *
 * Copyright (c) 2001-2013, Sebastian Bergmann <sebastian@phpunit.de>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   * Neither the name of Sebastian Bergmann nor the names of his
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @package    PHPUnit
 * @subpackage Util
 * @author     Sebastian Bergmann <sebastian@phpunit.de>
 * @copyright  2001-2013 Sebastian Bergmann <sebastian@phpunit.de>
 * @license    http://www.opensource.org/licenses/BSD-3-Clause  The BSD 3-Clause License
 * @link       http://www.phpunit.de/
 * @since      File available since Release 3.6.0
 */

/**
 * String helpers.
 *
 * @package    PHPUnit
 * @subpackage Util
 * @author     Sebastian Bergmann <sebastian@phpunit.de>
 * @copyright  2001-2013 Sebastian Bergmann <sebastian@phpunit.de>
 * @license    http://www.opensource.org/licenses/BSD-3-Clause  The BSD 3-Clause License
 * @link       http://www.phpunit.de/
 * @since      Class available since Release 3.6.0
 */
class PHPUnit_Util_String {

  /**
   * Converts a string to UTF-8 encoding.
   *
   * @param  string $string
   * @return string
   */
  public static function convertToUtf8($string) {
    if (!self::isUtf8($string)) {
      if (function_exists('mb_convert_encoding')) {
        $string = mb_convert_encoding($string, 'UTF-8');
      }
      else {
        $string = utf8_encode($string);
      }
    }
    return $string;
  }

  /**
   * Checks a string for UTF-8 encoding.
   *
   * @param  string $string
   * @return boolean
   */
  protected static function isUtf8($string) {
    $length = strlen($string);
    for ($i = 0; $i < $length; $i++) {
      if (ord($string[$i]) < 0x80) {
        $n = 0;
      }
      else {
        if ((ord($string[$i]) & 0xe0) == 0xc0) {
          $n = 1;
        }
        else {
          if ((ord($string[$i]) & 0xf0) == 0xe0) {
            $n = 2;
          }
          else {
            if ((ord($string[$i]) & 0xf0) == 0xf0) {
              $n = 3;
            }
            else {
              return FALSE;
            }
          }
        }
      }
      for ($j = 0; $j < $n; $j++) {
        if (++$i == $length || (ord($string[$i]) & 0xc0) != 0x80) {
          return FALSE;
        }
      }
    }
    return TRUE;
  }

}