<?php

namespace utf8;

// Check whether PCRE has been compiled with UTF-8 support

$UTF8_ar = array();

if (preg_match('/^.{1}$/u', "ñ", $UTF8_ar) !== 1) {

trigger_error('PCRE is not compiled with UTF-8 support', E_USER_ERROR);

}

unset($UTF8_ar);

// Constant: PHP_UTF_8_DIR

// Holds the current directory.

if (!defined('PHP_UTF_8_DIR')) {

define('PHP_UTF_8_DIR', dirname(__FILE__));

}

// Constant: PHP_UTF_8_MODE

// Will be 'native' or 'mbstring'.

if (!defined('PHP_UTF_8_MODE')) {

if (extension_loaded('mbstring')) {

define('PHP_UTF_8_MODE', 'mbstring');

} else {

define('PHP_UTF_8_MODE', 'native');

}

}

// Load core functions

if (PHP_UTF_8_MODE == 'mbstring') {

// If string overloading is active, it will break many of the native implementations

if (ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING) {

trigger_error('String functions are overloaded by mbstring, must be ' . 'set to 0, 1 or 4 in php.ini for php-utf-8 to work.',

E_USER_ERROR);

}

// Also need to check we have the correct internal mbstring encoding.

// The Mbstring functions assume mbstring internal encoding is set to UTF-8.

mb_language('uni');

mb_internal_encoding('UTF-8');

require_once PHP_UTF_8_DIR . '/core/mbstring.php';

} elseif (PHP_UTF_8_MODE == 'native') {

require_once PHP_UTF_8_DIR . '/core/native.php';

}

// Load the native implementation of utf8_trim

require_once PHP_UTF_8_DIR . '/functions/trim.php';