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<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2014 - 2016, British Columbia Institute of Technology * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/) * @copyright Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/) * @license http://opensource.org/licenses/MIT MIT License * @link https://codeigniter.com * @since Version 2.0.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * Utf8 Class * * Provides support for UTF-8 environments * * @package CodeIgniter * @subpackage Libraries * @category UTF-8 * @author EllisLab Dev Team * @link https://codeigniter.com/user_guide/libraries/utf8.html */ class CI_Utf8 { /** * Class constructor * * Determines if UTF-8 support is to be enabled. * * @return void */ public function __construct() { if ( defined('PREG_BAD_UTF8_ERROR') // PCRE must support UTF-8 && (ICONV_ENABLED === TRUE OR MB_ENABLED === TRUE) // iconv or mbstring must be installed && strtoupper(config_item('charset')) === 'UTF-8' // Application charset must be UTF-8 ) { define('UTF8_ENABLED', TRUE); log_message('debug', 'UTF-8 Support Enabled'); } else { define('UTF8_ENABLED', FALSE); log_message('debug', 'UTF-8 Support Disabled'); } log_message('info', 'Utf8 Class Initialized'); } // -------------------------------------------------------------------- /** * Clean UTF-8 strings * * Ensures strings contain only valid UTF-8 characters. * * @param string $str String to clean * @return string */ public function clean_string($str) { if ($this->is_ascii($str) === FALSE) { if (MB_ENABLED) { $str = mb_convert_encoding($str, 'UTF-8', 'UTF-8'); } elseif (ICONV_ENABLED) { $str = @iconv('UTF-8', 'UTF-8//IGNORE', $str); } } return $str; } // -------------------------------------------------------------------- /** * Remove ASCII control characters * * Removes all ASCII control characters except horizontal tabs, * line feeds, and carriage returns, as all others can cause * problems in XML. * * @param string $str String to clean * @return string */ public function safe_ascii_for_xml($str) { return remove_invisible_characters($str, FALSE); } // -------------------------------------------------------------------- /** * Convert to UTF-8 * * Attempts to convert a string to UTF-8. * * @param string $str Input string * @param string $encoding Input encoding * @return string $str encoded in UTF-8 or FALSE on failure */ public function convert_to_utf8($str, $encoding) { if (MB_ENABLED) { return mb_convert_encoding($str, 'UTF-8', $encoding); } elseif (ICONV_ENABLED) { return @iconv($encoding, 'UTF-8', $str); } return FALSE; } // -------------------------------------------------------------------- /** * Is ASCII? * * Tests if a string is standard 7-bit ASCII or not. * * @param string $str String to check * @return bool */ public function is_ascii($str) { return (preg_match('/[^\x00-\x7F]/S', $str) === 0); } }
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