PHP实现的json类实例

php  /  管理员 发布于 7年前   152

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

* @author  Matt Knapp * @author  Brett Stimmerman * @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:** * // 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);* */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。

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