下面给大家介绍哦php语言的json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：

<?php
/* * ****************************************************************************
* $base: $
*
* $Author: $
* Berlin Qin
*
* $History: base.js $
* Berlin Qin // created
*
* $contacted
* webfmt@gmail.com
*
*
* *************************************************************************** */
/* ===========================================================================
* license
*
* 、Open Source Licenses
* webfmt is distributed under the GPL, LGPL and MPL open source licenses.
* This triple copyleft licensing model avoids incompatibility with other open source licenses.
* These Open Source licenses are specially indicated for:
* Integrating webfmt into Open Source software;
* Personal and educational use of webfmt;
* Integrating webfmt in commercial software,
* taking care of satisfying the Open Source licenses terms,
* while not able or interested on supporting webfmt and its development.
*
* 、Commercial License – fbis source Closed Distribution License - CDL
* For many companies and products, Open Source licenses are not an option.
* This is why the fbis source Closed Distribution License (CDL) has been introduced.
* It is a non-copyleft license which gives companies complete freedom
* when integrating webfmt into their products and web sites.
* This license offers a very flexible way to integrate webfmt in your commercial application.
* These are the main advantages it offers over an Open Source license:
* Modifications and enhancements doesn't need to be released under an Open Source license;
* There is no need to distribute any Open Source license terms alongside with your product
* and no reference to it have to be done;
* No references to webfmt have to be done in any file distributed with your product;
* The source code of webfmt doesn't have to be distributed alongside with your product;
* You can remove any file from webfmt when integrating it with your product.
* The CDL is a lifetime license valid for all releases of webfmt published during
* and before the year following its purchase.
* It's valid for webfmt releases also. It includes year of personal e-mail support.
*
* ************************************************************************************************************************************************* */
function jsonDecode($json)
{
$result = array();
try
{
if (PHP_VERSION_ID > )
{
$result = (array) json_decode($json);
}
else
{
$json = str_replace(array("\\\\", "\\\""), array("&#;", "&#;"), $json);
$parts = preg_split("@(\"[^\"]*\")|([\[\]\{\},:])|\s@is", $json, -, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
foreach ($parts as $index => $part)
{
if (strlen($part) == )
{
switch ($part)
{
case "[":
case "{":
$parts[$index] = "array(";
break;
case "]":
case "}":
$parts[$index] = ")";
break;
case ":":
$parts[$index] = "=>";
break;
case ",":
break;
default:
break;
}
}
}
$json = str_replace(array("&#;", "&#;", "$"), array("\\\\", "\\\"", "\\$"), implode("", $parts));
$result = eval("return $json;");
}
}
catch (Exception $e)
{
$result = array("error" => $e->getCode());
}
return $result;
}
function valueTostr($val)
{
if (is_string($val))
{
$val = str_replace('\"', "\\\"", $val);
$val = str_replace("\\", "\\\\", $val);
$val = str_replace("/", "\\/", $val);
$val = str_replace("\t", "\\t", $val);
$val = str_replace("\n", "\\n", $val);
$val = str_replace("\r", "\\r", $val);
$val = str_replace("\b", "\\b", $val);
$val = str_replace("\f", "\\f", $val);
return '"' . $val . '"';
}
elseif (is_int($val))
return sprintf('%d', $val);
elseif (is_float($val))
return sprintf('%F', $val);
elseif (is_bool($val))
return ($val ? 'true' : 'false');
else
return 'null';
}
function jsonEncode($arr)
{
$result = "{}";
try
{
if (PHP_VERSION_ID > )
{
$result = json_encode($arr);
}
else
{
$parts = array();
$is_list = false;
if (!is_array($arr))
{
$arr = (array) $arr;
}
$end = count($arr) - ;
if (count($arr) > )
{
if (is_numeric(key($arr)))
{
$result = "[";
for ($i = ; $i < count($arr); $i++)
{
if (is_array($arr[$i]))
{
$result = $result . jsonEncode($arr[$i]);
}
else
{
$result = $result . valueTostr($arr[$i]);
}
if ($i != $end)
{
$result = $result . ",";
}
}
$result = $result . "]";
}
else
{
$result = "{";
$i = ;
foreach ($arr as $key => $value)
{
$result = $result . '"' . $key . '":';
if (is_array($value))
{
$result = $result . jsonEncode($value);
}
else
{
$result = $result . valueTostr($value);
}
if ($i != $end)
{
$result = $result . ",";
}
$i++;
}
$result = $result . "}";
}
}
else
{
$result = "[]";
}
}
}
catch (Exception $e)
{
}
return $result;
}
?>