vendor/phputf8/utf8.php

   1 <?php
   2 /**
   3 * This is the dynamic loader for the library. It checks whether you have
   4 * the mbstring extension available and includes relevant files
   5 * on that basis, falling back to the native (as in written in PHP) version
   6 * if mbstring is unavailabe.
   7 *
   8 * It's probably easiest to use this, if you don't want to understand
   9 * the dependencies involved, in conjunction with PHP versions etc. At
  10 * the same time, you might get better performance by managing loading
  11 * yourself. The smartest way to do this, bearing in mind performance,
  12 * is probably to "load on demand" - i.e. just before you use these
  13 * functions in your code, load the version you need.
  14 *
  15 * It makes sure the the following functions are available;
  16 * utf8_strlen, utf8_strpos, utf8_strrpos, utf8_substr,
  17 * utf8_strtolower, utf8_strtoupper
  18 * Other functions in the ./native directory depend on these
  19 * six functions being available
  20 * @package utf8
  21 */
  22
  23 /**
  24 * Put the current directory in this constant
  25 */
  26 if ( !defined('UTF8') ) {
  27     define('UTF8',dirname(__FILE__));
  28 }
  29
  30 /**
  31 * If string overloading is active, it will break many of the
  32 * native implementations. mbstring.func_overload must be set
  33 * to 0, 1 or 4 in php.ini (string overloading disabled).
  34 * Also need to check we have the correct internal mbstring
  35 * encoding
  36 */
  37 if ( extension_loaded('mbstring')) {
  38     if ( ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING ) {
  39         trigger_error('String functions are overloaded by mbstring',E_USER_ERROR);
  40     }
  41     mb_internal_encoding('UTF-8');
  42 }
  43
  44 /**
  45 * Check whether PCRE has been compiled with UTF-8 support
  46 */
  47 $UTF8_ar = array();
  48 if ( preg_match('/^.{1}$/u',"ñ",$UTF8_ar) != 1 ) {
  49     trigger_error('PCRE is not compiled with UTF-8 support',E_USER_ERROR);
  50 }
  51 unset($UTF8_ar);
  52
  53
  54 /**
  55 * Load the smartest implementations of utf8_strpos, utf8_strrpos
  56 * and utf8_substr
  57 */
  58 if ( !defined('UTF8_CORE') ) {
  59     if ( function_exists('mb_substr') ) {
  60         require_once UTF8 . '/mbstring/core.php';
  61     } else {
  62         require_once UTF8 . '/utils/unicode.php';
  63         require_once UTF8 . '/native/core.php';
  64     }
  65 }
  66
  67 /**
  68 * Load the native implementation of utf8_substr_replace
  69 */
  70 require_once UTF8 . '/substr_replace.php';
  71
  72 /**
  73 * You should now be able to use all the other utf_* string functions
  74 */