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标题: JSON编解码函数的php实现 [打印本页]
作者: lanneret_sky    时间: 2011-12-23 01:58
标题: JSON编解码函数的php实现
由于开发一个ajax file manager for web开源项目,数据交换使用的json格式，后来发现在低版本的php上运行会有问题，仔细调试发现json_decode和json_encode无 法正常工作，于是查阅资料，发现低版本的php没有实现这两个函数，为了兼容性，我只好自己实现一个php版的json编码解码代码，并保证和 json2.js的一致，测试调试并通过，现在将其公布出来，供有相同需求的同学使用：
  1. <?php
  2. /* * ****************************************************************************
  3.  * $base: $
  4.  *
  5.  * $Author: $
  6.  *         Berlin Qin
  7.  *
  8.  * $History: base.js $
  9.  * Berlin Qin 2011/5/15 created
  10.  *
  11.  * $contacted
  12.  * webfmt@gmail.com
  13.  * http://www.webfmt.com
  14.  *
  15.  * *************************************************************************** */
  16. /* ===========================================================================
  17.  * license
  18.  *
  19.  * You may not use this file except in compliance with the License.
     * Software distributed under the License is distributed on an "AS IS" basis,
     *   WITHOUT WARRANTY OF ANY KIND, either express or implied,except that you announce  what to you write.

     * The Initial Developer of the Original Code is Berlin Qin.
    Copyright (C) 2000-2050, Berlin Qin., All Rights Reserved.
  20.  *
  21.  *************************************************************************/

  23. function jsonDecode($json)
  24. {
  25.     $result = array();
  26.     try
  27.     {
  28.         if (PHP_VERSION_ID > 50300)
  29.         {
  30.             $result = (array) json_decode($json);
  31.         }
  32.         else
  33.         {
  34.             $json = str_replace(array("\\\\", "\\\""), array("&#92;", "&#34;"), $json);
  35.             $parts = preg_split("@(\"[^\"]*\")|([\[\]\{\},:])|\s@is", $json, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
  36.             foreach ($parts as $index => $part)
  37.             {
  38.                 if (strlen($part) == 1)
  39.                 {
  40.                     switch ($part)
  41.                     {
  42.                         case "[":
  43.                         case "{":
  44.                             $parts[$index] = "array(";
  45.                             break;
  46.                         case "]":
  47.                         case "}":
  48.                             $parts[$index] = ")";
  49.                             break;
  50.                         case ":":
  51.                             $parts[$index] = "=>";
  52.                             break;
  53.                         case ",":
  54.                             break;
  55.                         default:
  56.                             break;
  57.                     }
  58.                 }
  59.             }
  60.             $json = str_replace(array("&#92;", "&#34;", "$"), array("\\\\", "\\\"", "\\$"), implode("", $parts));
  61.             $result = eval("return $json;");
  62.         }
  63.     }
  64.     catch (Exception $e)
  65.     {
  66.         $result = array("error" => $e->getCode());
  67.     }
  68.     return $result;
  69. }

  71. function valueTostr($val)
  72. {
  73.     if (is_string($val))
  74.     {
  75.         $val = str_replace('\"', "\\\"", $val);
  76.         $val = str_replace("\\", "\\\\", $val);
  77.         $val = str_replace("/", "\\/", $val);
  78.         $val = str_replace("\t", "\\t", $val);
  79.         $val = str_replace("\n", "\\n", $val);
  80.         $val = str_replace("\r", "\\r", $val);
  81.         $val = str_replace("\b", "\\b", $val);
  82.         $val = str_replace("\f", "\\f", $val);
  83.         return '"' . $val . '"';
  84.     }
  85.     elseif (is_int($val))
  86.         return sprintf('%d', $val);
  87.     elseif (is_float($val))
  88.         return sprintf('%F', $val);
  89.     elseif (is_bool($val))
  90.         return ($val ? 'true' : 'false');
  91.     else
  92.         return 'null';
  93. }

  95. function jsonEncode($arr)
  96. {
  97.     $result = "{}";
  98.     try
  99.     {
  100.         if (PHP_VERSION_ID > 50300)
  101.         {
  102.             $result = json_encode($arr);
  103.         }
  104.         else
  105.         {
  106.             $parts = array();
  107.             $is_list = false;
  108.             if (!is_array($arr))
  109.             {
  110.                 $arr = (array) $arr;
  111.             }
  112.             $end = count($arr) - 1;
  113.             if (count($arr) > 0)
  114.             {
  115.                 if (is_numeric(key($arr)))
  116.                 {
  117.                     $result = "[";
  118.                     for ($i = 0; $i < count($arr); $i++)
  119.                     {
  120.                         if (is_array($arr[$i]))
  121.                         {
  122.                             $result = $result . jsonEncode($arr[$i]);
  123.                         }
  124.                         else
  125.                         {
  126.                             $result = $result . valueTostr($arr[$i]);
  127.                         }
  128.                         if ($i != $end)
  129.                         {
  130.                             $result = $result . ",";
  131.                         }
  132.                     }
  133.                     $result = $result . "]";
  134.                 }
  135.                 else
  136.                 {
  137.                     $result = "{";
  138.                     $i = 0;
  139.                     foreach ($arr as $key => $value)
  140.                     {
  141.                         $result = $result . '"' . $key . '":';
  142.                         if (is_array($value))
  143.                         {
  144.                             $result = $result . jsonEncode($value);
  145.                         }
  146.                         else
  147.                         {
  148.                             $result = $result . valueTostr($value);
  149.                         }
  150.                         if ($i != $end)
  151.                         {
  152.                             $result = $result . ",";
  153.                         }
  154.                         $i++;
  155.                     }
  156.                     $result = $result . "}";
  157.                 }
  158.             }
  159.             else
  160.             {
  161.                 $result = "[]";
  162.             }
  163.         }
  164.     }
  165.     catch (Exception $e)
  166.     {

  168.     }
  169.     return $result;
  170. }
  171. ?>





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