php json轉數組出錯

php json轉數組出錯求助
1：先輸出json

//組合醫生資訊JSON
$jsonDoctorInfo  = "{\"mecdoctor\":[";
$jsonDoctorInfo .= "{\"doctorId\":\"".$doctorId."\",\"doctorName\":\"".$strDoctorName."\", \"doctorprice\":\"".$strPrice."\",\"expertise\":\"".$strExpertise."\",\"departments\":\"".$strdepartments."\",\"doctorTitle\":\"".$strTitle."\",\"doctorPhoto\":\"".$strDoctorPhoto."\"}";
$jsonDoctorInfo .= "]}";

2：擷取並decode
$jsonGetDoctorInfoData = json_encode($jsonGetDoctorInfoData);
$objGetDoctorInfoData = json_decode($jsonGetDoctorInfoData);
輸出：

{"mecdoctor":[{"doctorId":"","doctorName":"XXXX", "doctorprice":"122","expertise":"XXXXX","departments":"醫內科","doctorTitle":"主任醫師","doctorPhoto":"hmh"}]}

3：將json轉換成數組

//解析JSON資料
function _json_decode($json){
$comment = false;
$out = '$x=';
for ($i=0; $iif (!$comment){
if ( ($json[$i] == '{') || ($json[$i] == '[') )
$out .= ' array(';
else if (($json[$i] == '}') || ($json[$i] == ']'))
$out .= ')';
else if ($json[$i] == ':')
$out .= '=>';
else
$out .= $json[$i];          
}else
$out .= $json[$i];
if($json[$i]== '"' && $json[($i-1)]!="\\")
$comment = !$comment;
}
eval($out.";");

return $x;
}

4：出現問題
Parse error: syntax error, unexpected T_DOUBLE_ARROW in /home/u945504094/public_html/config/config.inc.php(876) : eval()'d code on line 1

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------解決方案--------------------
沒有問題呀

$s = '{"mecdoctor":[{"doctorId":"","doctorName":"XXXX", "doctorprice":"122","expertise":"XXXXX","departments":"醫內科","doctorTitle":"主任醫師","doctorPhoto":"hmh"}]}';

print_r(_json_decode($s));

    function _json_decode($json){
        $comment = false;
        $out = '$x=';
        for ($i=0; $i            if (!$comment){
                if ( ($json[$i] == '{') 
------解決方案--------------------
 ($json[$i] == '[') )
                    $out .= ' array(';
                else if (($json[$i] == '}') 
------解決方案--------------------
 ($json[$i] == ']'))
                    $out .= ')';
                else if ($json[$i] == ':')
                    $out .= '=>';
                else
                    $out .= $json[$i];          
            }else
                $out .= $json[$i];
            if($json[$i]== '"' && $json[($i-1)]!="\\")
                $comment = !$comment;
        }
        eval($out.";");
         
        return $x;
    }

Array
(
    [mecdoctor] => Array
        (
            [0] => Array
                (
                    [doctorId] =>  
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