无法将类stdClass的对象转换为字符串错误 [英] Object of class stdClass could not be converted to string error

问题描述

我有以下字符串:

{"Coords":[{"Accuracy":"65","Latitude":"53.277720488429026","Longitude":"-9.012038778269686","Timestamp":"Fri Jul 05 2013 11:59:34 GMT+0100 (IST)"},{"Accuracy":"65","Latitude":"53.277720488429026","Longitude":"-9.012038778269686","Timestamp":"Fri Jul 05 2013 11:59:34 GMT+0100 (IST)"},{"Accuracy":"65","Latitude":"53.27770755361785","Longitude":"-9.011979642121824","Timestamp":"Fri Jul 05 2013 12:02:09 GMT+0100 (IST)"},{"Accuracy":"65","Latitude":"53.27769091555766","Longitude":"-9.012051410095722","Timestamp":"Fri Jul 05 2013 12:02:17 GMT+0100 (IST)"},{"Accuracy":"65","Latitude":"53.27769091555766","Longitude":"-9.012051410095722","Timestamp":"Fri Jul 05 2013 12:02:17 GMT+0100 (IST)"}],"Scan":"Whatever"}

我想用php解码.该字符串是通过sql查询获得的.参见下面的代码:

Which I want to decode in php. The string is obtained via a sql query. See code below:

$TrackDetails_Query= "SELECT * FROM Tracks WHERE TrackID='".$TrackNum."' ORDER BY TrackID DESC";

        $TrackDetails_Result= mysql_query($TrackDetails_Query) or die (mysql_error());

        if (mysql_num_rows($TrackDetails_Result)==0){
                echo 'There are no tracks for the number entered';
            }
        else{
                            $traces=$row['Traces'];
                            $decoded_traces=json_decode($traces);
                            echo $decoded_traces;
            }
    }

但是我得到了错误:

Catchable fatal error: Object of class stdClass could not be converted to string

推荐答案

出现错误是因为您试图将stdClass对象转换为字符串，这是它不支持的.

You get the error because you are trying to turn a stdClass object into a string, something it doesn't support.

而不是echo $decoded_traces，请尝试var_dump($decoded_traces)-这将为您解码后的对象提供诊断视图(我想这就是您想要的).您应该会发现它是这样的

Instead of echo $decoded_traces try var_dump($decoded_traces) - that will give a diagnostic view of the object you've decoded (which I presume is what you wanted). You should find it looks like this

class stdClass#1 (2) {
  public $Coords =>
  array(5) {
    [0] =>
    class stdClass#2 (4) {
      public $Accuracy =>
      string(2) "65"
      public $Latitude =>
      string(18) "53.277720488429026"
      public $Longitude =>
      string(18) "-9.012038778269686"
      public $Timestamp =>
      string(39) "Fri Jul 05 2013 11:59:34 GMT+0100 (IST)"
    }
    [1] => (more of the same, edited for brevity)
    [2] =>
    [3] =>
    [4] =>
  }
  public $Scan =>
  string(8) "Whatever"
}

默认情况下， json_encode 将创建与上述类似的stdClass对象.如果您希望使用关联数组，请将true作为第二个参数传递给json_decode，例如$decoded_traces=json_decode($traces, true);

By default, json_encode will create stdClass objects like the above. If you would prefer an associative array, pass true as the second parameter to json_decode, e.g. $decoded_traces=json_decode($traces, true);

此外，尽管不能将stdClass转换为字符串，但是您自己的类可以-实现

As a further aside, although stdClass can't be turned into a string, your own classes can - a class which implements the __toString magic method could be converted to a string!

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