json.lib.php

Go to the documentation of this file.

<?php
/* Copyright (C) 2011-2012  Laurent Destailleur <eldy@users.sourceforge.net>
 * Copyright (C) 2011-2012  Regis Houssin   <regis.houssin@inodbox.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 * or see https://www.gnu.org/
 */

if (!function_exists('json_encode'))
{
  function json_encode($elements)
  {
    return dol_json_encode($elements);
  }
}

function dol_json_encode($elements)
{
  dol_syslog("For better performance, enable the native json in your PHP", LOG_WARNING);

  $num = 0;
  if (is_object($elements)) // Count number of properties for an object
  {
    foreach ($elements as $key => $value) $num++;
  } else {
    $num = count($elements);
  }
  //var_dump($num);

  // determine type
  if (is_numeric(key($elements)) && key($elements) == 0)
  {
    // indexed (list)
    $keysofelements = array_keys($elements); // Elements array mus have key that does not start with 0 and end with num-1, so we will use this later.
    $output = '[';
    for ($i = 0, $last = ($num - 1); $i < $num; $i++)
    {
      if (!isset($elements[$keysofelements[$i]])) continue;
      if (is_array($elements[$keysofelements[$i]]) || is_object($elements[$keysofelements[$i]])) $output .= json_encode($elements[$keysofelements[$i]]);
      else $output .= _val($elements[$keysofelements[$i]]);
      if ($i !== $last) $output .= ',';
    }
    $output .= ']';
  } else {
    // associative (object)
    $output = '{';
    $last = $num - 1;
    $i = 0;
    $tmpelements = array();
    if (is_array($elements)) $tmpelements = $elements;
    if (is_object($elements)) $tmpelements = get_object_vars($elements);
    foreach ($tmpelements as $key => $value)
    {
      $output .= '"'.$key.'":';
      if (is_array($value)) $output .= json_encode($value);
      else $output .= _val($value);
      if ($i !== $last) $output .= ',';
      ++$i;
    }
    $output .= '}';
  }

  // return
  return $output;
}

function _val($val)
{
  if (is_string($val)) {
    // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
    $ascii = '';
    $strlen_var = strlen($val);

    /*
       * 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) {
      $ord_var_c = ord($val[$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
          $ascii .= '\\'.$val[$c];
          break;

        case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
          // characters U-00000000 - U-0000007F (same as ASCII)
          $ascii .= $val[$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*', $ord_var_c, ord($val[$c + 1]));
          $c += 1;
          $utf16 = utf82utf16($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*', $ord_var_c, ord($val[$c + 1]), ord($val[$c + 2]));
          $c += 2;
          $utf16 = utf82utf16($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*', $ord_var_c, ord($val[$c + 1]), ord($val[$c + 2]), ord($val[$c + 3]));
          $c += 3;
          $utf16 = utf82utf16($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*', $ord_var_c, ord($val[$c + 1]), ord($val[$c + 2]), ord($val[$c + 3]), ord($val[$c + 4]));
          $c += 4;
          $utf16 = utf82utf16($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*', $ord_var_c, ord($val[$c + 1]), ord($val[$c + 2]), ord($val[$c + 3]), ord($val[$c + 4]), ord($val[$c + 5]));
          $c += 5;
          $utf16 = utf82utf16($char);
          $ascii .= sprintf('\u%04s', bin2hex($utf16));
          break;
      }
    }

    return '"'.$ascii.'"';
  } elseif (is_int($val)) return sprintf('%d', $val);
  elseif (is_float($val)) return sprintf('%F', $val);
  elseif (is_bool($val)) return ($val ? 'true' : 'false');
  else return 'null';
}

if (!function_exists('json_decode'))
{
  function json_decode($json, $assoc = false)
  {
    return dol_json_decode($json, $assoc);
  }
}

function dol_json_decode($json, $assoc = false)
{
  dol_syslog("For better performance, enable the native json in your PHP", LOG_WARNING);

  $comment = false;

  $out = '';
  $strLength = strlen($json); // Must stay strlen and not dol_strlen because we want technical length, not visible length
  for ($i = 0; $i < $strLength; $i++)
  {
    if (!$comment)
    {
      if (($json[$i] == '{') || ($json[$i] == '[')) $out .= 'array(';
      elseif (($json[$i] == '}') || ($json[$i] == ']')) $out .= ')';
      elseif ($json[$i] == ':') $out .= ' => ';
      else $out .= $json[$i];
    } else $out .= $json[$i];
    if ($json[$i] == '"' && $json[($i - 1)] != "\\") $comment = !$comment;
  }

  $out = _unval($out);

  $array = array();

  // Return an array
  if ($out != '') {
    try {
      eval('$array = '.$out.';');
    } catch (Exception $e) {
      $array = array();
    }
  }

  // Return an object
  if (!$assoc)
  {
    if (!empty($array))
    {
      $object = false;
      if (count($array) > 0) {
        $object = (object) array();
      }
      foreach ($array as $key => $value)
      {
        if ($key) $object->{$key} = $value;
      }

      return $object;
    }

    return false;
  }

  return $array;
}

function _unval($val)
{
  $reg = array();
  while (preg_match('/\\\u([0-9A-F]{2})([0-9A-F]{2})/i', $val, $reg))
  {
    // single, escaped unicode character
    $utf16 = chr(hexdec($reg[1])).chr(hexdec($reg[2]));
    $utf8  = utf162utf8($utf16);
    $val = preg_replace('/\\\u'.$reg[1].$reg[2].'/i', $utf8, $val);
  }
  return $val;
}

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

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 '';
}