php语言的json实现
由于开发一个ajaxfilemanagerforweb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：
/
$base:$
$Author:$
BerlinQin
$History:base.js$
BerlinQin2011/5/15created
$contacted
webfmt@gmail.com
www.webfmt.com
/
/===========================================================================
license
1、OpenSourceLicenses
webfmtisdistributedundertheGPL,LGPLandMPLopensourcelicenses.
Thistriplecopyleftlicensingmodelavoidsincompatibilitywithotheropensourcelicenses.
TheseOpenSourcelicensesarespeciallyindicatedfor:
IntegratingwebfmtintoOpenSourcesoftware;
Personalandeducationaluseofwebfmt;
Integratingwebfmtincommercialsoftware,
takingcareofsatisfyingtheOpenSourcelicensesterms,
whilenotableorinterestedonsupportingwebfmtanditsdevelopment.
2、CommercialLicense–fbissourceClosedDistributionLicense-CDL
Formanycompaniesandproducts,OpenSourcelicensesarenotanoption.
ThisiswhythefbissourceClosedDistributionLicense(CDL)hasbeenintroduced.
Itisanon-copyleftlicensewhichgivescompaniescompletefreedom
whenintegratingwebfmtintotheirproductsandwebsites.
Thislicenseoffersaveryflexiblewaytointegratewebfmtinyourcommercialapplication.
ThesearethemainadvantagesitoffersoveranOpenSourcelicense:
Modificationsandenhancementsdoesn''tneedtobereleasedunderanOpenSourcelicense;
ThereisnoneedtodistributeanyOpenSourcelicensetermsalongsidewithyourproduct
andnoreferencetoithavetobedone;
Noreferencestowebfmthavetobedoneinanyfiledistributedwithyourproduct;
Thesourcecodeofwebfmtdoesn’thavetobedistributedalongsidewithyourproduct;
Youcanremoveanyfilefromwebfmtwhenintegratingitwithyourproduct.
TheCDLisalifetimelicensevalidforallreleasesofwebfmtpublishedduring
andbeforetheyearfollowww.baiyuewang.netwingitspurchase.
It''svalidforwebfmtreleasesalso.Itincludes1yearofpersonale-mailsupport.
/
functionjsonDecode($json)
{
$result=array();
try
{
if(PHP_VERSION_ID>50300)
{
$result=(array)json_decode($json);
}
else
{
$json=str_replace(array("\\\\","\\\""),array("\","""),$json);
$parts=preg_split("@(\"[^\"]\")|([\[\]\{\},:])|\s@is",$json,-1,PREG_SPLIT_NO_EMPTY|PREG_SPLIT_DELIM_CAPTURE);
foreach($partsas$index=>$part)
{
if(strlen($part)==1)
{
switch($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$result;
}
functionvalueTostr($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))
returnsprintf(''%d'',$val);
elseif(is_float($val))
returnsprintf(''%F'',$val);
elseif(is_bool($val))
return($val?''true'':''false'');
else
return''null'';
}
functionjsonEncode($arr)
{
$result="{}";
try
{
if(PHP_VERSION_ID>50300)
{
$result=json_encode($arr);
}
else
{
$parts=array();
$is_list=false;
if(!is_array($arr))
{
$arr=(array)$arr;
}
$end=count($arr)-1;
if(count($arr)>0)
{
if(is_numeric(key($arr)))
{
$result="[";
for($i=0;$i
{
if(is_array($arr[$i]))
{
$result=$result.jsonEncode($arr[$i]);
}
else
{
$result=$result.valueTostr($arr[$i]);
}
if($i!=$end)
{
$result=$result.",";
}
}
$result=$result."]";
}
else
{
$result="{";
$i=0;
foreach($arras$key=>$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;
}
?>
如果使
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