<?php/*** @version $Id: unicode.php 7692 2007-06-08 20:41:29Z tcp $* Tools for conversion between UTF-8 and unicode* The Original Code is Mozilla Communicator client code.* The Initial Developer of the Original Code is* Netscape Communications Corporation.* Portions created by the Initial Developer are Copyright (C) 1998* the Initial Developer. All Rights Reserved.* Ported to PHP by Henri Sivonen (http://hsivonen.iki.fi)* Slight modifications to fit with phputf8 library by Harry Fuecks (hfuecks gmail com)* @see http://lxr.mozilla.org/seamonkey/source/intl/uconv/src/nsUTF8ToUnicode.cpp* @see http://lxr.mozilla.org/seamonkey/source/intl/uconv/src/nsUnicodeToUTF8.cpp* @see http://hsivonen.iki.fi/php-utf8/* @package utf8* @subpackage unicode*///--------------------------------------------------------------------/*** Takes an UTF-8 string and returns an array of ints representing the* Unicode characters. Astral planes are supported ie. the ints in the* output can be > 0xFFFF. Occurrances of the BOM are ignored. Surrogates* are not allowed.* Returns false if the input string isn't a valid UTF-8 octet sequence* and raises a PHP error at level E_USER_WARNING* Note: this function has been modified slightly in this library to* trigger errors on encountering bad bytes* @author <hsivonen@iki.fi>* @param string UTF-8 encoded string* @return mixed array of unicode code points or FALSE if UTF-8 invalid* @see utf8_from_unicode* @see http://hsivonen.iki.fi/php-utf8/* @package utf8* @subpackage unicode*/function utf8_to_unicode($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;}