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freenetis-github/system/core/utf8.php @ 18ac9009

8baed187 Michal Kliment
<?php defined('SYSPATH') or die('No direct script access.');
/**
* A port of phputf8 to a unified file/class. Checks PHP status to ensure that
* UTF-8 support is available and normalize global variables to UTF-8. It also
* provides multi-byte aware replacement string functions.
*
* This file is licensed differently from the rest of Kohana. As a port of
* phputf8, which is LGPL software, this file is released under the LGPL.
*
* PCRE needs to be compiled with UTF-8 support (--enable-utf8).
* Support for Unicode properties is highly recommended (--enable-unicode-properties).
* @see http://php.net/manual/reference.pcre.pattern.modifiers.php
*
* UTF-8 conversion will be much more reliable if the iconv extension is loaded.
* @see http://php.net/iconv
*
* The mbstring extension is highly recommended, but must not be overloading
* string functions.
* @see http://php.net/mbstring
*
* $Id: utf8.php 1847 2008-01-28 20:30:44Z Geert $
*
* @package Core
* @author Kohana Team
* @copyright (c) 2007 Kohana Team
* @copyright (c) 2005 Harry Fuecks
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
*/

if ( ! preg_match('/^.$/u', 'ñ'))
{
trigger_error
(
'<a href="http://php.net/pcre">PCRE</a> has not been compiled with UTF-8 support. '.
'See <a href="http://php.net/manual/reference.pcre.pattern.modifiers.php">PCRE Pattern Modifiers</a> '.
'for more information. This application cannot be run without UTF-8 support.',
E_USER_ERROR
);
}

if ( ! extension_loaded('iconv'))
{
trigger_error
(
'The <a href="http://php.net/iconv">iconv</a> extension is not loaded. '.
'Without iconv, strings cannot be properly translated to UTF-8 from user input. '.
'This application cannot be run without UTF-8 support.',
E_USER_ERROR
);
}

if (extension_loaded('mbstring') AND (ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING))
{
trigger_error
(
'The <a href="http://php.net/mbstring">mbstring</a> extension is overloading PHP\'s native string functions. '.
'Disable this by setting mbstring.func_overload to 0, 1, 4 or 5 in php.ini or a .htaccess file.'.
'This application cannot be run without UTF-8 support.',
E_USER_ERROR
);
}

// Check PCRE support for Unicode properties such as \p and \X.
$ER = error_reporting(0);
define('PCRE_UNICODE_PROPERTIES', (bool) preg_match('/^\pL$/u', 'ñ'));
error_reporting($ER);

// SERVER_UTF8 ? use mb_* functions : use non-native functions
if (extension_loaded('mbstring'))
{
mb_internal_encoding('UTF-8');
define('SERVER_UTF8', TRUE);
}
else
{
define('SERVER_UTF8', FALSE);
}

// Convert all global variables to UTF-8.
$_GET = utf8::clean($_GET);
$_POST = utf8::clean($_POST);
$_COOKIE = utf8::clean($_COOKIE);
$_SERVER = utf8::clean($_SERVER);

if (PHP_SAPI == 'cli')
{
// Convert command line arguments
$_SERVER['argv'] = utf8::clean($_SERVER['argv']);
}

final class utf8 {

/**
* Recursively cleans arrays, objects, and strings. Removes ASCII control
* codes and converts to UTF-8 while silently discarding incompatible
* UTF-8 characters.
*
* @param string string to clean
* @return string
*/
public static function clean($str)
{
if (is_array($str) OR is_object($str))
{
foreach($str as $key => $val)
{
$str[self::clean($key)] = self::clean($val);
}
}
elseif (is_string($str) AND $str != '')
{
// iconv is fairly expensive, so it is only used when needed
if ( ! self::is_ascii($str))
{
$str = @iconv('UTF-8', 'UTF-8//IGNORE', $str);
}

$str = self::strip_ascii_ctrl($str);
}

return $str;
}

/**
* Tests whether a string contains only 7bit ASCII bytes. This is used to
* determine when to use native functions or UTF-8 functions.
*
* @param string string to check
* @return bool
*/
public static function is_ascii($str)
{
return ! preg_match('/[^\x00-\x7F]/S', $str);
}

/**
* Strips out device control codes in the ASCII range.
*
* @param string string to clean
* @return string
*/
public static function strip_ascii_ctrl($str)
{
return preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S', '', $str);
}

/**
* Strips out all non-7bit ASCII bytes.
*
* @param string string to clean
* @return string
*/
public static function strip_non_ascii($str)
{
return preg_replace('/[^\x00-\x7F]+/S', '', $str);
}

/**
* Replaces special/accented UTF-8 characters by ASCII-7 'equivalents'.
*
* @author Andreas Gohr <andi@splitbrain.org>
*
* @param string string to transliterate
* @param integer -1 lowercase only, +1 uppercase only, 0 both cases
* @return string
*/
public static function transliterate_to_ascii($str, $case = 0)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _transliterate_to_ascii($str, $case);
}

/**
* Returns the length of the given string.
* @see http://php.net/strlen
*
* @param string string being measured for length
* @return integer
*/
public static function strlen($str)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _strlen($str);
}

/**
* Finds position of first occurrence of a UTF-8 string.
* @see http://php.net/strlen
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string haystack
* @param string needle
* @param integer offset from which character in haystack to start searching
* @return integer position of needle
* @return boolean FALSE if the needle is not found
*/
public static function strpos($str, $search, $offset = 0)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _strpos($str, $search, $offset);
}

/**
* Finds position of last occurrence of a char in a UTF-8 string.
* @see http://php.net/strrpos
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string haystack
* @param string needle
* @param integer offset from which character in haystack to start searching
* @return integer position of needle
* @return boolean FALSE if the needle is not found
*/
public static function strrpos($str, $search, $offset = 0)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _strrpos($str, $search, $offset);
}

/**
* Returns part of a UTF-8 string.
* @see http://php.net/substr
*
* @author Chris Smith <chris@jalakai.co.uk>
*
* @param string input string
* @param integer offset
* @param integer length limit
* @return string
*/
public static function substr($str, $offset, $length = NULL)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _substr($str, $offset, $length);
}

/**
* Replaces text within a portion of a UTF-8 string.
* @see http://php.net/substr_replace
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string input string
* @param string replacement string
* @param integer offset
* @return string
*/
public static function substr_replace($str, $replacement, $offset, $length = NULL)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _substr_replace($str, $replacement, $offset, $length);
}

/**
* Makes a UTF-8 string lowercase.
* @see http://php.net/strtolower
*
* @author Andreas Gohr <andi@splitbrain.org>
*
* @param string mixed case string
* @return string
*/
public static function strtolower($str)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _strtolower($str);
}

/**
* Makes a UTF-8 string uppercase.
* @see http://php.net/strtoupper
*
* @author Andreas Gohr <andi@splitbrain.org>
*
* @param string mixed case string
* @return string
*/
public static function strtoupper($str)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _strtoupper($str);
}

/**
* Makes a UTF-8 string's first character uppercase.
* @see http://php.net/ucfirst
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string mixed case string
* @return string
*/
public static function ucfirst($str)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _ucfirst($str);
}

/**
* Makes the first character of every word in a UTF-8 string uppercase.
* @see http://php.net/ucwords
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string mixed case string
* @return string
*/
public static function ucwords($str)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _ucwords($str);
}

/**
* Case-insensitive UTF-8 string comparison.
* @see http://php.net/strcasecmp
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string string to compare
* @param string string to compare
* @return integer less than 0 if str1 is less than str2
* @return integer greater than 0 if str1 is greater than str2
* @return integer 0 if they are equal
*/
public static function strcasecmp($str1, $str2)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _strcasecmp($str1, $str2);
}

/**
* Returns a string or an array with all occurrences of search in subject (ignoring case).
* replaced with the given replace value.
* @see http://php.net/str_ireplace
*
* @note It's not fast and gets slower if $search and/or $replace are arrays.
* @author Harry Fuecks <hfuecks@gmail.com
*
* @param string|array text to replace
* @param string|array replacement text
* @param string|array subject text
* @param integer number of matched and replaced needles will be returned via this parameter which is passed by reference
* @return string if the input was a string
* @return array if the input was an array
*/
public static function str_ireplace($search, $replace, $str, & $count = NULL)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _str_ireplace($search, $replace, $str, $count);
}

/**
* Case-insenstive UTF-8 version of strstr. Returns all of input string
* from the first occurrence of needle to the end.
* @see http://php.net/stristr
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string input string
* @param string needle
* @return string matched substring if found
* @return boolean FALSE if the substring was not found
*/
public static function stristr($str, $search)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _stristr($str, $search);
}

/**
* Finds the length of the initial segment matching mask.
* @see http://php.net/strspn
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string input string
* @param string mask for search
* @param integer start position of the string to examine
* @param integer length of the string to examine
* @return integer length of the initial segment that contains characters in the mask
*/
public static function strspn($str, $mask, $offset = NULL, $length = NULL)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _strspn($str, $mask, $offset, $length);
}

/**
* Finds the length of the initial segment not matching mask.
* @see http://php.net/strcspn
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string input string
* @param string mask for search
* @param integer start position of the string to examine
* @param integer length of the string to examine
* @return integer length of the initial segment that contains characters not in the mask
*/
public static function strcspn($str, $mask, $offset = NULL, $length = NULL)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _strcspn($str, $mask, $offset, $length);
}

/**
* Pads a UTF-8 string to a certain length with another string.
* @see http://php.net/str_pad
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string input string
* @param integer desired string length after padding
* @param string string to use as padding
* @param string padding type: STR_PAD_RIGHT, STR_PAD_LEFT, or STR_PAD_BOTH
* @return string
*/
public static function str_pad($str, $final_str_length, $pad_str = ' ', $pad_type = STR_PAD_RIGHT)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _str_pad($str, $final_str_length, $pad_str, $pad_type);
}

/**
* Converts a UTF-8 string to an array.
* @see http://php.net/str_split
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string input string
* @param integer maximum length of each chunk
* @return array
*/
public static function str_split($str, $split_length = 1)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _str_split($str, $split_length);
}

/**
* Reverses a UTF-8 string.
* @see http://php.net/strrev
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string string to be reversed
* @return string
*/
public static function strrev($str)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _strrev($str);
}

/**
* Strips whitespace (or other UTF-8 characters) from the beginning and
* end of a string.
* @see http://php.net/trim
*
* @author Andreas Gohr <andi@splitbrain.org>
*
* @param string input string
* @param string string of characters to remove
* @return string
*/
public static function trim($str, $charlist = NULL)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _trim($str, $charlist);
}

/**
* Strips whitespace (or other UTF-8 characters) from the beginning of a string.
* @see http://php.net/ltrim
*
* @author Andreas Gohr <andi@splitbrain.org>
*
* @param string input string
* @param string string of characters to remove
* @return string
*/
public static function ltrim($str, $charlist = NULL)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _ltrim($str, $charlist);
}

/**
* Strips whitespace (or other UTF-8 characters) from the end of a string.
* @see http://php.net/rtrim
*
* @author Andreas Gohr <andi@splitbrain.org>
*
* @param string input string
* @param string string of characters to remove
* @return string
*/
public static function rtrim($str, $charlist = NULL)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _rtrim($str, $charlist);
}

/**
* Returns the unicode ordinal for a character.
* @see http://php.net/ord
*
* @author Harry Fuecks <hfuecks@gmail.com>
*
* @param string UTF-8 encoded character
* @return integer
*/
public static function ord($chr)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _ord($chr);
}

/**
* Takes an UTF-8 string and returns an array of ints representing the Unicode characters.
* Astral planes are supported i.e. the ints in the output can be > 0xFFFF.
* Occurrances of the BOM are ignored. Surrogates are not allowed.
*
* The Original Code is Mozilla Communicator client code.
* The Initial Developer of the Original Code is Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998 the Initial Developer.
* Ported to PHP by Henri Sivonen <hsivonen@iki.fi>, see http://hsivonen.iki.fi/php-utf8/.
* Slight modifications to fit with phputf8 library by Harry Fuecks <hfuecks@gmail.com>.
*
* @param string UTF-8 encoded string
* @return array unicode code points
* @return boolean FALSE if the string is invalid
*/
public static function to_unicode($str)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _to_unicode($str);
}

/**
* Takes an array of ints representing the Unicode characters and returns a UTF-8 string.
* Astral planes are supported i.e. the ints in the input can be > 0xFFFF.
* Occurrances of the BOM are ignored. Surrogates are not allowed.
*
* The Original Code is Mozilla Communicator client code.
* The Initial Developer of the Original Code is Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998 the Initial Developer.
* Ported to PHP by Henri Sivonen <hsivonen@iki.fi>, see http://hsivonen.iki.fi/php-utf8/.
* Slight modifications to fit with phputf8 library by Harry Fuecks <hfuecks@gmail.com>.
*
* @param array unicode code points representing a string
* @return string utf8 string of characters
* @return boolean FALSE if a code point cannot be found
*/
public static function from_unicode($arr)
{
require_once SYSPATH.'core/utf8/'.__FUNCTION__.EXT;
return _from_unicode($arr);
}

} // End utf8