function Services_JSON::encode in Album Photos 6.2

encodes an arbitrary variable into JSON format

@access public

Parameters

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 value

mixed JSON string representation of input var or an error if a problem occurs

1 call to Services_JSON::encode()

Services_JSON::name_value in php/json-php4.php

array-walking function for use in generating JSON-formatted name-value pairs

File

php/json-php4.php, line 236

Class

Services_JSON

Converts to and from JSON format.

Code

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 (double) $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 == 0x8:
            $ascii .= '\\b';
            break;
          case $ord_var_c == 0x9:
            $ascii .= '\\t';
            break;
          case $ord_var_c == 0xa:
            $ascii .= '\\n';
            break;
          case $ord_var_c == 0xc:
            $ascii .= '\\f';
            break;
          case $ord_var_c == 0xd:
            $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");
  }
}