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PHP实现的json类实例

程序员文章站 2023-12-01 23:25:16
本文实例讲述了php实现的json类。分享给大家供大家参考。具体如下: 这里注意json_encode只有(php 5 >= 5.2.0, pecl json &g...

本文实例讲述了php实现的json类。分享给大家供大家参考。具体如下:

这里注意json_encode只有(php 5 >= 5.2.0, pecl json >= 1.2.0)才有

<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* converts to and from json format.
*
* json (javascript object notation) is a lightweight data-interchange
* format. it is easy for humans to read and write. it is easy for machines
* to parse and generate. it is based on a subset of the javascript
* programming language, standard ecma-262 3rd edition - december 1999.
* this feature can also be found in python. json is a text format that is
* completely language independent but uses conventions that are familiar
* to programmers of the c-family of languages, including c, c++, c#, java,
* javascript, perl, tcl, and many others. these properties make json an
* ideal data-interchange language.
*
* this package provides a simple encoder and decoder for json notation. it
* is intended for use with client-side javascript applications that make
* use of httprequest to perform server communication functions - data can
* be encoded into json notation for use in a client-side javascript, or
* decoded from incoming javascript requests. json format is native to
* javascript, and can be directly eval()'ed with no further parsing
* overhead
*
* all strings should be in ascii or utf-8 format!
*
* license: redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met: redistributions of source code must retain the
* above copyright notice, this list of conditions and the following
* disclaimer. redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* this software is provided ``as is'' and any express or implied
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose are disclaimed. in
* no event shall contributors be liable for any direct, indirect,
* incidental, special, exemplary, or consequential damages (including,
* but not limited to, procurement of substitute goods or services; loss
* of use, data, or profits; or business interruption) however caused and
* on any theory of liability, whether in contract, strict liability, or
* tort (including negligence or otherwise) arising in any way out of the
* use of this software, even if advised of the possibility of such
* damage.
*
* @category
* @package  services_json
* @author  michal migurski <mike-json@teczno.com>
* @author  matt knapp <mdknapp[at]gmail[dot]com>
* @author  brett stimmerman <brettstimmerman[at]gmail[dot]com>
* @copyright 2005 michal migurski
* @version  cvs: $id: json.php,v 1.31 2006/06/28 05:54:17 migurski exp $
* @license  http://www.opensource.org/licenses/bsd-license.php
* @link  http://pear.php.net/pepr/pepr-proposal-show.php?id=198
*/
/**
* marker constant for services_json::decode(), used to flag stack state
*/
define('services_json_slice', 1);
/**
* marker constant for services_json::decode(), used to flag stack state
*/
define('services_json_in_str', 2);
/**
* marker constant for services_json::decode(), used to flag stack state
*/
define('services_json_in_arr', 3);
/**
* marker constant for services_json::decode(), used to flag stack state
*/
define('services_json_in_obj', 4);
/**
* marker constant for services_json::decode(), used to flag stack state
*/
define('services_json_in_cmt', 5);
/**
* behavior switch for services_json::decode()
*/
define('services_json_loose_type', 16);
/**
* behavior switch for services_json::decode()
*/
define('services_json_suppress_errors', 32);
/**
* converts to and from json format.
*
* brief example of use:
*
* <code>
* // create a new instance of services_json
* $json = new services_json();
*
* // convert a complexe value to json notation, and send it to the browser
* $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
* $output = $json->encode($value);
*
* print($output);
* // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
*
* // accept incoming post data, assumed to be in json notation
* $input = file_get_contents('php://input', 1000000);
* $value = $json->decode($input);
* </code>
*/
class services_json
{
 /**
 * constructs a new json instance
 *
 * @param int  $use object behavior flags; combine with boolean-or
 *
 *       possible values:
 *       - services_json_loose_type: loose typing.
 *         "{...}" syntax creates associative arrays
 *         instead of objects in decode().
 *       - services_json_suppress_errors: error suppression.
 *         values which can't be encoded (e.g. resources)
 *         appear as null instead of throwing errors.
 *         by default, a deeply-nested resource will
 *         bubble up with an error, so all return values
 *         from encode() should be checked with iserror()
 */
 function services_json($use = 0)
 {
  $this->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 '';
 }
 /**
 * 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('mb_convert_encoding')) {
   return mb_convert_encoding($utf8, 'utf-16', 'utf-8');
  }
  switch(strlen($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 '';
 }
 /**
 * 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 'boolean':
    return $var ? 'true' : 'false';
   case 'null':
    return 'null';
   case 'integer':
    return (int) $var;
   case 'double':
   case 'float':
    return (float) $var;
   case 'string':
    // strings are expected to be in ascii or utf-8 format
    $ascii = '';
    $strlen_var = strlen($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 .= '\b';
       break;
      case $ord_var_c == 0x09:
       $ascii .= '\t';
       break;
      case $ord_var_c == 0x0a:
       $ascii .= '\n';
       break;
      case $ord_var_c == 0x0c:
       $ascii .= '\f';
       break;
      case $ord_var_c == 0x0d:
       $ascii .= '\r';
       break;
      case $ord_var_c == 0x22:
      case $ord_var_c == 0x2f:
      case $ord_var_c == 0x5c:
       // double quote, slash, slosh
       $ascii .= '\\'.$var{$c};
       break;
      case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7f)):
       // characters u-00000000 - u-0000007f (same as ascii)
       $ascii .= $var{$c};
       break;
      case (($ord_var_c & 0xe0) == 0xc0):
       // characters u-00000080 - u-000007ff, mask 110xxxxx
       // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       $char = pack('c*', $ord_var_c, ord($var{$c + 1}));
       $c += 1;
       $utf16 = $this->utf82utf16($char);
       $ascii .= sprintf('\u%04s', bin2hex($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('c*', $ord_var_c,
           ord($var{$c + 1}),
           ord($var{$c + 2}));
       $c += 2;
       $utf16 = $this->utf82utf16($char);
       $ascii .= sprintf('\u%04s', bin2hex($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('c*', $ord_var_c,
           ord($var{$c + 1}),
           ord($var{$c + 2}),
           ord($var{$c + 3}));
       $c += 3;
       $utf16 = $this->utf82utf16($char);
       $ascii .= sprintf('\u%04s', bin2hex($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('c*', $ord_var_c,
           ord($var{$c + 1}),
           ord($var{$c + 2}),
           ord($var{$c + 3}),
           ord($var{$c + 4}));
       $c += 4;
       $utf16 = $this->utf82utf16($char);
       $ascii .= sprintf('\u%04s', bin2hex($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('c*', $ord_var_c,
           ord($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);
       $ascii .= sprintf('\u%04s', bin2hex($utf16));
       break;
     }
    }
    return '"'.$ascii.'"';
   case 'array':
    /*
    * as per json spec if any array key is not an integer
    * we must treat the the whole array as an object. we
    * also try to catch a sparsely populated associative
    * array with numeric keys here because some js engines
    * will create an array with empty indexes up to
    * max_index which can cause memory issues and because
    * the keys, which may be relevant, will be remapped
    * otherwise.
    *
    * as per the ecma and json specification an object may
    * have any string as a property. unfortunately due to
    * a hole in the ecma specification if the key is a
    * ecma reserved word or starts with a digit the
    * parameter is only accessible using ecmascript's
    * bracket notation.
    */
    // treat as a json object
    if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
     $properties = array_map(array($this, 'name_value'),
           array_keys($var),
           array_values($var));
     foreach($properties as $property) {
      if(services_json::iserror($property)) {
       return $property;
      }
     }
     return '{' . join(',', $properties) . '}';
    }
    // treat it like a regular array
    $elements = array_map(array($this, 'encode'), $var);
    foreach($elements as $element) {
     if(services_json::iserror($element)) {
      return $element;
     }
    }
    return '[' . join(',', $elements) . ']';
   case 'object':
    $vars = get_object_vars($var);
    $properties = array_map(array($this, 'name_value'),
          array_keys($vars),
          array_values($vars));
    foreach($properties as $property) {
     if(services_json::iserror($property)) {
      return $property;
     }
    }
    return '{' . join(',', $properties) . '}';
   default:
    return ($this->use & services_json_suppress_errors)
     ? 'null'
     : 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 $value reference to an array element to be encoded
 *
 * @return string json-formatted name-value pair, like '"name":value'
 * @access private
 */
 function name_value($name, $value)
 {
  $encoded_value = $this->encode($value);
  if(services_json::iserror($encoded_value)) {
   return $encoded_value;
  }
  return $this->encode(strval($name)) . ':' . $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)
 {
  $str = preg_replace(array(
    // eliminate single line comments in '// ...' form
    '#^\s*//(.+)$#m',
    // eliminate multi-line comments in '/* ... */' form, at start of string
    '#^\s*/\*(.+)\*/#us',
    // eliminate multi-line comments in '/* ... */' form, at end of string
    '#/\*(.+)\*/\s*$#us'
   ), '', $str);
  // eliminate extraneous space
  return trim($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 'true':
    return true;
   case 'false':
    return false;
   case 'null':
    return null;
   default:
    $m = array();
    if (is_numeric($str)) {
     // lookie-loo, it's a number
     // this would work on its own, but i'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)$str;
    } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
     // strings returned in utf-8 format
     $delim = substr($str, 0, 1);
     $chrs = substr($str, 1, -1);
     $utf8 = '';
     $strlen_chrs = strlen($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 == '\b':
        $utf8 .= chr(0x08);
        ++$c;
        break;
       case $substr_chrs_c_2 == '\t':
        $utf8 .= chr(0x09);
        ++$c;
        break;
       case $substr_chrs_c_2 == '\n':
        $utf8 .= chr(0x0a);
        ++$c;
        break;
       case $substr_chrs_c_2 == '\f':
        $utf8 .= chr(0x0c);
        ++$c;
        break;
       case $substr_chrs_c_2 == '\r':
        $utf8 .= chr(0x0d);
        ++$c;
        break;
       case $substr_chrs_c_2 == '\\"':
       case $substr_chrs_c_2 == '\\\'':
       case $substr_chrs_c_2 == '\\\\':
       case $substr_chrs_c_2 == '\\/':
        if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
         ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
         $utf8 .= $chrs{++$c};
        }
        break;
       case preg_match('/\\\u[0-9a-f]{4}/i', 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 <= 0x7f):
        $utf8 .= $chrs{$c};
        break;
       case ($ord_chrs_c & 0xe0) == 0xc0:
        // characters u-00000080 - u-000007ff, mask 110xxxxx
        //see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
        $utf8 .= substr($chrs, $c, 2);
        ++$c;
        break;
       case ($ord_chrs_c & 0xf0) == 0xe0:
        // characters u-00000800 - u-0000ffff, mask 1110xxxx
        // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
        $utf8 .= substr($chrs, $c, 3);
        $c += 2;
        break;
       case ($ord_chrs_c & 0xf8) == 0xf0:
        // characters u-00010000 - u-001fffff, mask 11110xxx
        // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
        $utf8 .= substr($chrs, $c, 4);
        $c += 3;
        break;
       case ($ord_chrs_c & 0xfc) == 0xf8:
        // characters u-00200000 - u-03ffffff, mask 111110xx
        // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
        $utf8 .= substr($chrs, $c, 5);
        $c += 4;
        break;
       case ($ord_chrs_c & 0xfe) == 0xfc:
        // characters u-04000000 - u-7fffffff, mask 1111110x
        // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
        $utf8 .= substr($chrs, $c, 6);
        $c += 5;
        break;
      }
     }
     return $utf8;
    } elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
     // array, or object notation
     if ($str{0} == '[') {
      $stk = array(services_json_in_arr);
      $arr = array();
     } else {
      if ($this->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('what' => services_json_slice,
           'where' => 0,
           'delim' => false));
     $chrs = substr($str, 1, -1);
     $chrs = $this->reduce_string($chrs);
     if ($chrs == '') {
      if (reset($stk) == services_json_in_arr) {
       return $arr;
      } else {
       return $obj;
      }
     }
     //print("\nparsing {$chrs}\n");
     $strlen_chrs = strlen($chrs);
     for ($c = 0; $c <= $strlen_chrs; ++$c) {
      $top = end($stk);
      $substr_chrs_c_2 = substr($chrs, $c, 2);
      if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == services_json_slice))) {
       // found a comma that is not inside a string, array, etc.,
       // or we've reached the end of the character list
       $slice = substr($chrs, $top['where'], ($c - $top['where']));
       array_push($stk, array('what' => services_json_slice, 'where' => ($c + 1), 'delim' => false));
       //print("found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
       if (reset($stk) == services_json_in_arr) {
        // we are in an array, so just push an element onto the stack
        array_push($arr, $this->decode($slice));
       } elseif (reset($stk) == services_json_in_obj) {
        // we are in an object, so figure
        // out the property name and set an
        // element in an associative array,
        // for now
        $parts = array();
        if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\s.*),?$/uis', $slice, $parts)) {
         // "name":value pair
         $key = $this->decode($parts[1]);
         $val = $this->decode($parts[2]);
         if ($this->use & services_json_loose_type) {
          $obj[$key] = $val;
         } else {
          $obj->$key = $val;
         }
        } elseif (preg_match('/^\s*(\w+)\s*:\s*(\s.*),?$/uis', $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{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != services_json_in_str)) {
       // found a quote, and we are not inside a string
       array_push($stk, array('what' => services_json_in_str, 'where' => $c, 'delim' => $chrs{$c}));
       //print("found start of string at {$c}\n");
      } elseif (($chrs{$c} == $top['delim']) &&
         ($top['what'] == services_json_in_str) &&
         ((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1)) {
       // found a quote, we're in a string, and it's not escaped
       // we know that it's not escaped becase there is _not_ an
       // odd number of backslashes at the end of the string so far
       array_pop($stk);
       //print("found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
      } elseif (($chrs{$c} == '[') &&
         in_array($top['what'], 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('what' => services_json_in_arr, 'where' => $c, 'delim' => false));
       //print("found start of array at {$c}\n");
      } elseif (($chrs{$c} == ']') && ($top['what'] == services_json_in_arr)) {
       // found a right-bracket, and we're in an array
       array_pop($stk);
       //print("found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
      } elseif (($chrs{$c} == '{') &&
         in_array($top['what'], 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('what' => services_json_in_obj, 'where' => $c, 'delim' => false));
       //print("found start of object at {$c}\n");
      } elseif (($chrs{$c} == '}') && ($top['what'] == services_json_in_obj)) {
       // found a right-brace, and we're in an object
       array_pop($stk);
       //print("found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
      } elseif (($substr_chrs_c_2 == '/*') &&
         in_array($top['what'], array(services_json_slice, services_json_in_arr, services_json_in_obj))) {
       // found a comment start, and we are in an array, object, or slice
       array_push($stk, array('what' => services_json_in_cmt, 'where' => $c, 'delim' => false));
       $c++;
       //print("found start of comment at {$c}\n");
      } elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == services_json_in_cmt)) {
       // found a comment end, and we're in one now
       array_pop($stk);
       $c++;
       for ($i = $top['where']; $i <= $c; ++$i)
        $chrs = substr_replace($chrs, ' ', $i, 1);
       //print("found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
      }
     }
     if (reset($stk) == services_json_in_arr) {
      return $arr;
     } elseif (reset($stk) == services_json_in_obj) {
      return $obj;
     }
    }
  }
 }
 /**
  * @todo ultimately, this should just call pear::iserror()
  */
 function iserror($data, $code = null)
 {
  if (class_exists('pear')) {
   return pear::iserror($data, $code);
  } elseif (is_object($data) && (get_class($data) == 'services_json_error' || is_subclass_of($data, 'services_json_error'))) {
   return true;
  }
  return false;
 }
}
if (class_exists('pear_error')) {
 class services_json_error extends pear_error
 {
  function services_json_error($message = 'unknown error', $code = null, $mode = null, $options = null, $userinfo = null)
  {
   parent::pear_error($message, $code, $mode, $options, $userinfo);
  }
 }
} else {
 /**
  * @todo ultimately, this class shall be descended from pear_error
  */
 class services_json_error
 {
  function services_json_error($message = 'unknown error', $code = null, $mode = null, $options = null, $userinfo = null)
  {
  }
 }
}
?>

希望本文所述对大家的php程序设计有所帮助。