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File Name : unicode.php

<?php
/**
* @version $Id: unicode.php 10381 2008-06-01 03:35:53Z pasamio $
* Tools for conversion between UTF-8 and unicode
* 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. All Rights Reserved.
* Ported to PHP by Henri Sivonen (http://hsivonen.iki.fi)
* Slight modifications to fit with phputf8 library by Harry Fuecks (hfuecks gmail com)
* @see http://lxr.mozilla.org/seamonkey/source/intl/uconv/src/nsUTF8ToUnicode.cpp
* @see http://lxr.mozilla.org/seamonkey/source/intl/uconv/src/nsUnicodeToUTF8.cpp
* @see http://hsivonen.iki.fi/php-utf8/
* @package utf8
* @subpackage unicode
*/

//--------------------------------------------------------------------
/**
* Takes an UTF-8 string and returns an array of ints representing the
* Unicode characters. Astral planes are supported ie. the ints in the
* output can be > 0xFFFF. Occurrances of the BOM are ignored. Surrogates
* are not allowed.
* Returns false if the input string isn't a valid UTF-8 octet sequence
* and raises a PHP error at level E_USER_WARNING
* Note: this function has been modified slightly in this library to
* trigger errors on encountering bad bytes
* @author <hsivonen@iki.fi>
* @param string UTF-8 encoded string
* @return mixed array of unicode code points or FALSE if UTF-8 invalid
* @see utf8_from_unicode
* @see http://hsivonen.iki.fi/php-utf8/
* @package utf8
* @subpackage unicode
*/
function utf8_to_unicode($str) {
    $mState = 0;     // cached expected number of octets after the current octet
                     // until the beginning of the next UTF8 character sequence
    $mUcs4  = 0;     // cached Unicode character
    $mBytes = 1;     // cached expected number of octets in the current sequence

$out = array();

$len = strlen($str);

for($i = 0; $i < $len; $i++) {

$in = ord($str{$i});

if ( $mState == 0) {

// When mState is zero we expect either a US-ASCII character or a
            // multi-octet sequence.
            if (0 == (0x80 & ($in))) {
                // US-ASCII, pass straight through.
                $out[] = $in;
                $mBytes = 1;

} else if (0xC0 == (0xE0 & ($in))) {
                // First octet of 2 octet sequence
                $mUcs4 = ($in);
                $mUcs4 = ($mUcs4 & 0x1F) << 6;
                $mState = 1;
                $mBytes = 2;

} else if (0xE0 == (0xF0 & ($in))) {
                // First octet of 3 octet sequence
                $mUcs4 = ($in);
                $mUcs4 = ($mUcs4 & 0x0F) << 12;
                $mState = 2;
                $mBytes = 3;

} else if (0xF0 == (0xF8 & ($in))) {
                // First octet of 4 octet sequence
                $mUcs4 = ($in);
                $mUcs4 = ($mUcs4 & 0x07) << 18;
                $mState = 3;
                $mBytes = 4;

} else if (0xF8 == (0xFC & ($in))) {
                /* First octet of 5 octet sequence.
                *
                * This is illegal because the encoded codepoint must be either
                * (a) not the shortest form or
                * (b) outside the Unicode range of 0-0x10FFFF.
                * Rather than trying to resynchronize, we will carry on until the end
                * of the sequence and let the later error handling code catch it.
                */
                $mUcs4 = ($in);
                $mUcs4 = ($mUcs4 & 0x03) << 24;
                $mState = 4;
                $mBytes = 5;

} else if (0xFC == (0xFE & ($in))) {
                // First octet of 6 octet sequence, see comments for 5 octet sequence.
                $mUcs4 = ($in);
                $mUcs4 = ($mUcs4 & 1) << 30;
                $mState = 5;
                $mBytes = 6;

} else {
                /* Current octet is neither in the US-ASCII range nor a legal first
                 * octet of a multi-octet sequence.
                 */
                trigger_error(
                        'utf8_to_unicode: Illegal sequence identifier '.
                            'in UTF-8 at byte '.$i,
                        E_USER_WARNING
                    );
                return FALSE;

}

} else {

// When mState is non-zero, we expect a continuation of the multi-octet
            // sequence
            if (0x80 == (0xC0 & ($in))) {

// Legal continuation.
                $shift = ($mState - 1) * 6;
                $tmp = $in;
                $tmp = ($tmp & 0x0000003F) << $shift;
                $mUcs4 |= $tmp;

/**
                * End of the multi-octet sequence. mUcs4 now contains the final
                * Unicode codepoint to be output
                */
                if (0 == --$mState) {

/*
                    * Check for illegal sequences and codepoints.
                    */
                    // From Unicode 3.1, non-shortest form is illegal
                    if (((2 == $mBytes) && ($mUcs4 < 0x0080)) ||
                        ((3 == $mBytes) && ($mUcs4 < 0x0800)) ||
                        ((4 == $mBytes) && ($mUcs4 < 0x10000)) ||
                        (4 < $mBytes) ||
                        // From Unicode 3.2, surrogate characters are illegal
                        (($mUcs4 & 0xFFFFF800) == 0xD800) ||
                        // Codepoints outside the Unicode range are illegal
                        ($mUcs4 > 0x10FFFF)) {

trigger_error(
                                'utf8_to_unicode: Illegal sequence or codepoint '.
                                    'in UTF-8 at byte '.$i,
                                E_USER_WARNING
                            );

return FALSE;

}

if (0xFEFF != $mUcs4) {
                        // BOM is legal but we don't want to output it
                        $out[] = $mUcs4;
                    }

//initialize UTF8 cache
                    $mState = 0;
                    $mUcs4  = 0;
                    $mBytes = 1;
                }

} else {
                /**
                *((0xC0 & (*in) != 0x80) && (mState != 0))
                * Incomplete multi-octet sequence.
                */
                trigger_error(
                        'utf8_to_unicode: Incomplete multi-octet '.
                        '   sequence in UTF-8 at byte '.$i,
                        E_USER_WARNING
                    );

return FALSE;
            }
        }
    }
    return $out;
}

//--------------------------------------------------------------------
/**
* Takes an array of ints representing the Unicode characters and returns
* a UTF-8 string. Astral planes are supported ie. the ints in the
* input can be > 0xFFFF. Occurrances of the BOM are ignored. Surrogates
* are not allowed.
* Returns false if the input array contains ints that represent
* surrogates or are outside the Unicode range
* and raises a PHP error at level E_USER_WARNING
* Note: this function has been modified slightly in this library to use
* output buffering to concatenate the UTF-8 string (faster) as well as
* reference the array by it's keys
* @param array of unicode code points representing a string
* @return mixed UTF-8 string or FALSE if array contains invalid code points
* @author <hsivonen@iki.fi>
* @see utf8_to_unicode
* @see http://hsivonen.iki.fi/php-utf8/
* @package utf8
* @subpackage unicode
*/
function utf8_from_unicode($arr) {
    ob_start();

foreach (array_keys($arr) as $k) {

# ASCII range (including control chars)
        if ( ($arr[$k] >= 0) && ($arr[$k] <= 0x007f) ) {

echo chr($arr[$k]);

# 2 byte sequence
        } else if ($arr[$k] <= 0x07ff) {

echo chr(0xc0 | ($arr[$k] >> 6));
            echo chr(0x80 | ($arr[$k] & 0x003f));

# Byte order mark (skip)
        } else if($arr[$k] == 0xFEFF) {

// nop -- zap the BOM

# Test for illegal surrogates
        } else if ($arr[$k] >= 0xD800 && $arr[$k] <= 0xDFFF) {

// found a surrogate
            trigger_error(
                'utf8_from_unicode: Illegal surrogate '.
                    'at index: '.$k.', value: '.$arr[$k],
                E_USER_WARNING
                );

return FALSE;

# 3 byte sequence
        } else if ($arr[$k] <= 0xffff) {

echo chr(0xe0 | ($arr[$k] >> 12));
            echo chr(0x80 | (($arr[$k] >> 6) & 0x003f));
            echo chr(0x80 | ($arr[$k] & 0x003f));

# 4 byte sequence
        } else if ($arr[$k] <= 0x10ffff) {

echo chr(0xf0 | ($arr[$k] >> 18));
            echo chr(0x80 | (($arr[$k] >> 12) & 0x3f));
            echo chr(0x80 | (($arr[$k] >> 6) & 0x3f));
            echo chr(0x80 | ($arr[$k] & 0x3f));

} else {

trigger_error(
                'utf8_from_unicode: Codepoint out of Unicode range '.
                    'at index: '.$k.', value: '.$arr[$k],
                E_USER_WARNING
                );

// out of range
            return FALSE;
        }
    }

$result = ob_get_contents();
    ob_end_clean();
    return $result;
}

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	historj6/historj6	0755	2011-10-17 03:39:31
..	dir	-	historj6/historj6	0755	2011-10-17 03:39:31
ascii.php	text/x-php	8.49 KB	historj6/historj6	0644	2009-11-04 10:45:04
bad.php	text/x-php	13.75 KB	historj6/historj6	0644	2008-11-11 07:54:05
index.html	text/html	44 B	historj6/historj6	0644	2008-11-11 07:54:05
patterns.php	text/x-php	2.97 KB	historj6/historj6	0644	2008-11-11 07:54:05
specials.php	text/x-php	7.35 KB	historj6/historj6	0644	2008-11-11 07:54:05
unicode.php	text/x-php	9.16 KB	historj6/historj6	0644	2008-11-11 07:54:05
validation.php	text/x-php	6.53 KB	historj6/historj6	0644	2008-11-11 07:54:05