PHP json类

代码

use = $use;
    }

   /**
    * convert a string from one UTF-16 char to one UTF-8 char
    *
    * Normally should be handled by mb_convert_encoding, but
    * provides a slower PHP-only method for installations
    * that lack the multibye string extension.
    *
    * @param    string  $utf16  UTF-16 character
    * @return   string  UTF-8 character
    * @access   private
    */
    function utf162utf8($utf16)
    {
        // oh please oh please oh please oh please oh please
        if(function_exists('mb_convert_encoding')) {
            return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
        }

        $bytes = (ord($utf16{0}) << 8) | ord($utf16{1});

        switch(true) {
            case ((0x7F & $bytes) == $bytes):
                // this case should never be reached, because we are in ASCII range
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr(0x7F & $bytes);

            case (0x07FF & $bytes) == $bytes:
                // return a 2-byte UTF-8 character
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr(0xC0 | (($bytes >> 6) & 0x1F))
                     . chr(0x80 | ($bytes & 0x3F));

            case (0xFFFF & $bytes) == $bytes:
                // return a 3-byte UTF-8 character
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr(0xE0 | (($bytes >> 12) & 0x0F))
                     . chr(0x80 | (($bytes >> 6) & 0x3F))
                     . chr(0x80 | ($bytes & 0x3F));
        }

        // ignoring UTF-32 for now, sorry
        return &#39;&#39;;
    }

   /**
    * convert a string from one UTF-8 char to one UTF-16 char
    *
    * Normally should be handled by mb_convert_encoding, but
    * provides a slower PHP-only method for installations
    * that lack the multibye string extension.
    *
    * @param    string  $utf8   UTF-8 character
    * @return   string  UTF-16 character
    * @access   private
    */
    function utf82utf16($utf8)
    {
        // oh please oh please oh please oh please oh please
        if(function_exists(&#39;mb_convert_encoding&#39;)) {
            return mb_convert_encoding($utf8, &#39;UTF-16&#39;, &#39;UTF-8&#39;);
        }

        switch(strlen($utf8)) {
            case 1:
                // this case should never be reached, because we are in ASCII range
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return $utf8;

            case 2:
                // return a UTF-16 character from a 2-byte UTF-8 char
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr(0x07 & (ord($utf8{0}) >> 2))
                     . chr((0xC0 & (ord($utf8{0}) << 6))
                         | (0x3F & ord($utf8{1})));

            case 3:
                // return a UTF-16 character from a 3-byte UTF-8 char
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr((0xF0 & (ord($utf8{0}) << 4))
                         | (0x0F & (ord($utf8{1}) >> 2)))
                     . chr((0xC0 & (ord($utf8{1}) << 6))
                         | (0x7F & ord($utf8{2})));
        }

        // ignoring UTF-32 for now, sorry
        return &#39;&#39;;
    }

   /**
    * encodes an arbitrary variable into JSON format
    *
    * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
    *                           see argument 1 to Services_JSON() above for array-parsing behavior.
    *                           if var is a strng, note that encode() always expects it
    *                           to be in ASCII or UTF-8 format!
    *
    * @return   mixed   JSON string representation of input var or an error if a problem occurs
    * @access   public
    */
    function encode($var)
    {
        switch (gettype($var)) {
            case &#39;boolean&#39;:
                return $var ? &#39;true&#39; : &#39;false&#39;;

            case &#39;NULL&#39;:
                return &#39;null&#39;;

            case &#39;integer&#39;:
                return (int) $var;

            case &#39;double&#39;:
            case &#39;float&#39;:
                return (float) $var;

            case &#39;string&#39;:
                // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
                $ascii = &#39;&#39;;
                $strlen_var = strlen($var);

               /*
                * Iterate over every character in the string,
                * escaping with a slash or encoding to UTF-8 where necessary
                */
                for ($c = 0; $c < $strlen_var; ++$c) {

                    $ord_var_c = ord($var{$c});

                    switch (true) {
                        case $ord_var_c == 0x08:
                            $ascii .= &#39;\b&#39;;
                            break;
                        case $ord_var_c == 0x09:
                            $ascii .= &#39;\t&#39;;
                            break;
                        case $ord_var_c == 0x0A:
                            $ascii .= &#39;\n&#39;;
                            break;
                        case $ord_var_c == 0x0C:
                            $ascii .= &#39;\f&#39;;
                            break;
                        case $ord_var_c == 0x0D:
                            $ascii .= &#39;\r&#39;;
                            break;

                        case $ord_var_c == 0x22:
                        case $ord_var_c == 0x2F:
                        case $ord_var_c == 0x5C:
                            // double quote, slash, slosh
                            $ascii .= &#39;\\&#39;.$var{$c};
                            break;

                        case (($ord_var_c >= 0x20) && ($ord_var_c utf82utf16($char);
                            $ascii .= sprintf(&#39;\u%04s&#39;, bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xF0) == 0xE0):
                            // characters U-00000800 - U-0000FFFF, mask 1110XXXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack(&#39;C*&#39;, $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}));
                            $c += 2;
                            $utf16 = $this->utf82utf16($char);
                            $ascii .= sprintf(&#39;\u%04s&#39;, bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xF8) == 0xF0):
                            // characters U-00010000 - U-001FFFFF, mask 11110XXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack(&#39;C*&#39;, $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}),
                                         ord($var{$c + 3}));
                            $c += 3;
                            $utf16 = $this->utf82utf16($char);
                            $ascii .= sprintf(&#39;\u%04s&#39;, bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xFC) == 0xF8):
                            // characters U-00200000 - U-03FFFFFF, mask 111110XX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack(&#39;C*&#39;, $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}),
                                         ord($var{$c + 3}),
                                         ord($var{$c + 4}));
                            $c += 4;
                            $utf16 = $this->utf82utf16($char);
                            $ascii .= sprintf(&#39;\u%04s&#39;, bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xFE) == 0xFC):
                            // characters U-04000000 - U-7FFFFFFF, mask 1111110X
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack(&#39;C*&#39;, $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}),
                                         ord($var{$c + 3}),
                                         ord($var{$c + 4}),
                                         ord($var{$c + 5}));
                            $c += 5;
                            $utf16 = $this->utf82utf16($char);
                            $ascii .= sprintf(&#39;\u%04s&#39;, bin2hex($utf16));
                            break;
                    }
                }

                return &#39;"&#39;.$ascii.&#39;"&#39;;

            case &#39;array&#39;:
               /*
                * As per JSON spec if any array key is not an integer
                * we must treat the the whole array as an object. We
                * also try to catch a sparsely populated associative
                * array with numeric keys here because some JS engines
                * will create an array with empty indexes up to
                * max_index which can cause memory issues and because
                * the keys, which may be relevant, will be remapped
                * otherwise.
                *
                * As per the ECMA and JSON specification an object may
                * have any string as a property. Unfortunately due to
                * a hole in the ECMA specification if the key is a
                * ECMA reserved word or starts with a digit the
                * parameter is only accessible using ECMAScript&#39;s
                * bracket notation.
                */

                // treat as a JSON object
                if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
                    $properties = array_map(array($this, &#39;name_value&#39;),
                                            array_keys($var),
                                            array_values($var));

                    foreach($properties as $property) {
                        if(Services_JSON::isError($property)) {
                            return $property;
                        }
                    }

                    return &#39;{&#39; . join(&#39;,&#39;, $properties) . &#39;}&#39;;
                }

                // treat it like a regular array
                $elements = array_map(array($this, &#39;encode&#39;), $var);

                foreach($elements as $element) {
                    if(Services_JSON::isError($element)) {
                        return $element;
                    }
                }

                return &#39;[&#39; . join(&#39;,&#39;, $elements) . &#39;]&#39;;

            case &#39;object&#39;:
                $vars = get_object_vars($var);

                $properties = array_map(array($this, &#39;name_value&#39;),
                                        array_keys($vars),
                                        array_values($vars));

                foreach($properties as $property) {
                    if(Services_JSON::isError($property)) {
                        return $property;
                    }
                }

                return &#39;{&#39; . join(&#39;,&#39;, $properties) . &#39;}&#39;;

            default:
                return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
                    ? &#39;null&#39;
                    : new Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
        }
    }

   /**
    * array-walking function for use in generating JSON-formatted name-value pairs
    *
    * @param    string  $name   name of key to use
    * @param    mixed   $value  reference to an array element to be encoded
    *
    * @return   string  JSON-formatted name-value pair, like &#39;"name":value&#39;
    * @access   private
    */
    function name_value($name, $value)
    {
        $encoded_value = $this->encode($value);

        if(Services_JSON::isError($encoded_value)) {
            return $encoded_value;
        }

        return $this->encode(strval($name)) . &#39;:&#39; . $encoded_value;
    }

   /**
    * reduce a string by removing leading and trailing comments and whitespace
    *
    * @param    $str    string      string value to strip of comments and whitespace
    *
    * @return   string  string value stripped of comments and whitespace
    * @access   private
    */
    function reduce_string($str)
    {
        $str = preg_replace(array(

                // eliminate single line comments in &#39;// ...&#39; form
                &#39;#^\s*//(.+)$#m&#39;,

                // eliminate multi-line comments in &#39;/* ... */&#39; form, at start of string
                &#39;#^\s*/\*(.+)\*/#Us&#39;,

                // eliminate multi-line comments in &#39;/* ... */&#39; form, at end of string
                &#39;#/\*(.+)\*/\s*$#Us&#39;

            ), &#39;&#39;, $str);

        // eliminate extraneous space
        return trim($str);
    }

   /**
    * decodes a JSON string into appropriate variable
    *
    * @param    string  $str    JSON-formatted string
    *
    * @return   mixed   number, boolean, string, array, or object
    *                   corresponding to given JSON input string.
    *                   See argument 1 to Services_JSON() above for object-output behavior.
    *                   Note that decode() always returns strings
    *                   in ASCII or UTF-8 format!
    * @access   public
    */
    function decode($str)
    {
        $str = $this->reduce_string($str);

        switch (strtolower($str)) {
            case &#39;true&#39;:
                return true;

            case &#39;false&#39;:
                return false;

            case &#39;null&#39;:
                return null;

            default:
                $m = array();

                if (is_numeric($str)) {
                    // Lookie-loo, it&#39;s a number

                    // This would work on its own, but I&#39;m trying to be
                    // good about returning integers where appropriate:
                    // return (float)$str;

                    // Return float or int, as appropriate
                    return ((float)$str == (integer)$str)
                        ? (integer)$str
                        : (float)$str;

                } elseif (preg_match(&#39;/^("|\&#39;).*(\1)$/s&#39;, $str, $m) && $m[1] == $m[2]) {
                    // STRINGS RETURNED IN UTF-8 FORMAT
                    $delim = substr($str, 0, 1);
                    $chrs = substr($str, 1, -1);
                    $utf8 = &#39;&#39;;
                    $strlen_chrs = strlen($chrs);

                    for ($c = 0; $c < $strlen_chrs; ++$c) {

                        $substr_chrs_c_2 = substr($chrs, $c, 2);
                        $ord_chrs_c = ord($chrs{$c});

                        switch (true) {
                            case $substr_chrs_c_2 == &#39;\b&#39;:
                                $utf8 .= chr(0x08);
                                ++$c;
                                break;
                            case $substr_chrs_c_2 == &#39;\t&#39;:
                                $utf8 .= chr(0x09);
                                ++$c;
                                break;
                            case $substr_chrs_c_2 == &#39;\n&#39;:
                                $utf8 .= chr(0x0A);
                                ++$c;
                                break;
                            case $substr_chrs_c_2 == &#39;\f&#39;:
                                $utf8 .= chr(0x0C);
                                ++$c;
                                break;
                            case $substr_chrs_c_2 == &#39;\r&#39;:
                                $utf8 .= chr(0x0D);
                                ++$c;
                                break;

                            case $substr_chrs_c_2 == &#39;\\"&#39;:
                            case $substr_chrs_c_2 == &#39;\\\&#39;&#39;:
                            case $substr_chrs_c_2 == &#39;\\\\&#39;:
                            case $substr_chrs_c_2 == &#39;\\/&#39;:
                                if (($delim == &#39;"&#39; && $substr_chrs_c_2 != &#39;\\\&#39;&#39;) ||
                                   ($delim == "&#39;" && $substr_chrs_c_2 != &#39;\\"&#39;)) {
                                    $utf8 .= $chrs{++$c};
                                }
                                break;

                            case preg_match(&#39;/\\\u[0-9A-F]{4}/i&#39;, substr($chrs, $c, 6)):
                                // single, escaped unicode character
                                $utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
                                       . chr(hexdec(substr($chrs, ($c + 4), 2)));
                                $utf8 .= $this->utf162utf8($utf16);
                                $c += 5;
                                break;

                            case ($ord_chrs_c >= 0x20) && ($ord_chrs_c use & SERVICES_JSON_LOOSE_TYPE) {
                            $stk = array(SERVICES_JSON_IN_OBJ);
                            $obj = array();
                        } else {
                            $stk = array(SERVICES_JSON_IN_OBJ);
                            $obj = new stdClass();
                        }
                    }

                    array_push($stk, array(&#39;what&#39;  => SERVICES_JSON_SLICE,
                                           &#39;where&#39; => 0,
                                           &#39;delim&#39; => false));

                    $chrs = substr($str, 1, -1);
                    $chrs = $this->reduce_string($chrs);

                    if ($chrs == &#39;&#39;) {
                        if (reset($stk) == SERVICES_JSON_IN_ARR) {
                            return $arr;

                        } else {
                            return $obj;

                        }
                    }

                    //print("\nparsing {$chrs}\n");

                    $strlen_chrs = strlen($chrs);

                    for ($c = 0; $c decode($parts[1]);
                                    $val = $this->decode($parts[2]);

                                    if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
                                        $obj[$key] = $val;
                                    } else {
                                        $obj->$key = $val;
                                    }
                                } elseif (preg_match(&#39;/^\s*(\w+)\s*:\s*(\S.*),?$/Uis&#39;, $slice, $parts)) {
                                    // name:value pair, where name is unquoted
                                    $key = $parts[1];
                                    $val = $this->decode($parts[2]);

                                    if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
                                        $obj[$key] = $val;
                                    } else {
                                        $obj->$key = $val;
                                    }
                                }

                            }

                        } elseif ((($chrs{$c} == &#39;"&#39;) || ($chrs{$c} == "&#39;")) && ($top[&#39;what&#39;] != SERVICES_JSON_IN_STR)) {
                            // found a quote, and we are not inside a string
                            array_push($stk, array(&#39;what&#39; => SERVICES_JSON_IN_STR, &#39;where&#39; => $c, &#39;delim&#39; => $chrs{$c}));
                            //print("Found start of string at {$c}\n");

                        } elseif (($chrs{$c} == $top[&#39;delim&#39;]) &&
                                 ($top[&#39;what&#39;] == SERVICES_JSON_IN_STR) &&
                                 ((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), &#39;\\&#39;))) % 2 != 1)) {
                            // found a quote, we&#39;re in a string, and it&#39;s not escaped
                            // we know that it&#39;s not escaped becase there is _not_ an
                            // odd number of backslashes at the end of the string so far
                            array_pop($stk);
                            //print("Found end of string at {$c}: ".substr($chrs, $top[&#39;where&#39;], (1 + 1 + $c - $top[&#39;where&#39;]))."\n");

                        } elseif (($chrs{$c} == &#39;[&#39;) &&
                                 in_array($top[&#39;what&#39;], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
                            // found a left-bracket, and we are in an array, object, or slice
                            array_push($stk, array(&#39;what&#39; => SERVICES_JSON_IN_ARR, &#39;where&#39; => $c, &#39;delim&#39; => false));
                            //print("Found start of array at {$c}\n");

                        } elseif (($chrs{$c} == &#39;]&#39;) && ($top[&#39;what&#39;] == SERVICES_JSON_IN_ARR)) {
                            // found a right-bracket, and we&#39;re in an array
                            array_pop($stk);
                            //print("Found end of array at {$c}: ".substr($chrs, $top[&#39;where&#39;], (1 + $c - $top[&#39;where&#39;]))."\n");

                        } elseif (($chrs{$c} == &#39;{&#39;) &&
                                 in_array($top[&#39;what&#39;], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
                            // found a left-brace, and we are in an array, object, or slice
                            array_push($stk, array(&#39;what&#39; => SERVICES_JSON_IN_OBJ, &#39;where&#39; => $c, &#39;delim&#39; => false));
                            //print("Found start of object at {$c}\n");

                        } elseif (($chrs{$c} == &#39;}&#39;) && ($top[&#39;what&#39;] == SERVICES_JSON_IN_OBJ)) {
                            // found a right-brace, and we&#39;re in an object
                            array_pop($stk);
                            //print("Found end of object at {$c}: ".substr($chrs, $top[&#39;where&#39;], (1 + $c - $top[&#39;where&#39;]))."\n");

                        } elseif (($substr_chrs_c_2 == &#39;/*&#39;) &&
                                 in_array($top[&#39;what&#39;], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
                            // found a comment start, and we are in an array, object, or slice
                            array_push($stk, array(&#39;what&#39; => SERVICES_JSON_IN_CMT, &#39;where&#39; => $c, &#39;delim&#39; => false));
                            $c++;
                            //print("Found start of comment at {$c}\n");

                        } elseif (($substr_chrs_c_2 == &#39;*/&#39;) && ($top[&#39;what&#39;] == SERVICES_JSON_IN_CMT)) {
                            // found a comment end, and we&#39;re in one now
                            array_pop($stk);
                            $c++;

                            for ($i = $top[&#39;where&#39;]; $i