function unicode_check

Checks for Unicode support in PHP and sets the proper settings if possible.

Because Drupal needs to be able to handle text in various encodings, we do not support mbstring function overloading. HTTP input/output conversion must be disabled for similar reasons.

Return value

string A string identifier of a failed multibyte extension check, if any. Otherwise, an empty string.

File

drupal/core/includes/bootstrap.inc, line 693

Functions that need to be loaded on every Drupal request.

Code

function unicode_check() {
  global $multibyte;

  // Check for mbstring extension.
  if (!function_exists('mb_strlen')) {
    $multibyte = UNICODE_SINGLEBYTE;
    return 'mb_strlen';
  }

  // Check mbstring configuration.
  if (ini_get('mbstring.func_overload') != 0) {
    $multibyte = UNICODE_ERROR;
    return 'mbstring.func_overload';
  }
  if (ini_get('mbstring.encoding_translation') != 0) {
    $multibyte = UNICODE_ERROR;
    return 'mbstring.encoding_translation';
  }
  if (ini_get('mbstring.http_input') != 'pass') {
    $multibyte = UNICODE_ERROR;
    return 'mbstring.http_input';
  }
  if (ini_get('mbstring.http_output') != 'pass') {
    $multibyte = UNICODE_ERROR;
    return 'mbstring.http_output';
  }

  // Set appropriate configuration.
  mb_internal_encoding('utf-8');
  mb_language('uni');
  $multibyte = UNICODE_MULTIBYTE;
  return '';
}