php数组输出这样的json

{    "data":[        {            "article_url":"/disease/item/1",            "create_time":"2014-08-11 11:38:58",            "knowledge_id":"1",            "title":"title1"        },        {            "article_url":"/disease/item/3",            "create_time":"2014-08-11 11:38:58",            "knowledge_id":"1",            "title":"title3"        }    ],    "errcode":"0",    "errdesc":""}

/** Json数据格式化 * @param  Mixed  $data   数据 * @param  String $indent 缩进字符，默认4个空格 * @return JSON */  function jsonFormat($data, $indent=null){        // 对数组中每个元素递归进行urlencode操作，保护中文字符      array_walk_recursive($data, 'jsonFormatProtect');        // json encode      $data = json_encode($data);        // 将urlencode的内容进行urldecode      $data = urldecode($data);        // 缩进处理      $ret = '';      $pos = 0;      $length = strlen($data);      $indent = isset($indent)? $indent : '    ';      $newline = "
";      $prevchar = '';      $outofquotes = true;        for($i=0; $i<=$length; $i++){            $char = substr($data, $i, 1);            if($char=='"' && $prevchar!='\'){              $outofquotes = !$outofquotes;          }elseif(($char=='}' || $char==']') && $outofquotes){              $ret .= $newline;              $pos --;              for($j=0; $j<$pos; $j++){                  $ret .= $indent;              }          }            $ret .= $char;                    if(($char==',' || $char=='{' || $char=='[') && $outofquotes){              $ret .= $newline;              if($char=='{' || $char=='['){                  $pos ++;              }                for($j=0; $j<$pos; $j++){                  $ret .= $indent;              }          }            $prevchar = $char;      }        return $ret;  }    /** 将数组元素进行urlencode * @param String $val */  function jsonFormatProtect(&$val){      if($val!==true && $val!==false && $val!==null){          $val = urlencode($val);      }  }    header('content-type:application/json;charset=utf8');  $result = array(	'data' => array(		array(			'article_url' => '/disease/item/1',			'create_time' => '2014-08-11 11:38:58',			'knowledge_id' => 1,			'title' => 'title1'		),		array(			'article_url' => '/disease/item/3',			'create_time' => '2014-08-11 11:38:58',			'knowledge_id' => 1,			'title' => 'title3'		),	),	'errcode' => 0,	'errdesc' => '');echo jsonFormat($result);