在php中检索answer_id

尝试下面的代码，它会向您返回答案id。

$str = "a:1:{i:0;O:8:'"stdClass'":7:{s:11:'"question_id'";s:1:'"1'";s:13:'"question_text'";s:18:'"This is question 1'";s:9:'"answerswer_id'";s:1:'"2'";s:11:'"answerswer_text'";s:4:'"asss'";s:11:'"points_base'";s:1:'"2'";s:6:'"points'";s:1:'"2'";s:15:'"custom_response'";s:0:'"'";}}";
$arry = unserialize($str);
echo $arry[0]->answer_id;

问题是您的序列化字符串包含反斜杠，这会扰乱序列化对象。解决方案：删除反斜杠并取消字符串的序列化，你就会得到你的对象：

    <?php

        $strSerializedWithSlashes       = 'a:1:{i:0;O:8:'"stdClass'":7:{s:11:'"question_id'";s:1:'"1'";s:13:'"question_text'";s:18:'"This is question 1'";s:9:'"answerswer_id'";s:1:'"2'";s:11:'"answerswer_text'";s:4:'"asss'";s:11:'"points_base'";s:1:'"2'";s:6:'"points'";s:1:'"2'";s:15:'"custom_response'";s:0:'"'";}}';
        $strSerializedWithoutSlashes    = str_replace("''", "", $strSerializedWithSlashes);
        $objUnSerialized                = unserialize($strSerializedWithoutSlashes);
        var_dump($objUnSerialized);

        // DUMPS::
        array (size=1)
          0 => 
            object(stdClass)[1]
              public 'question_id' => string '1' (length=1)
              public 'question_text' => string 'This is question 1' (length=18)
              public 'answer_id' => string '2' (length=1)
              public 'answer_text' => string 'asss' (length=4)
              public 'points_base' => string '2' (length=1)
              public 'points' => string '2' (length=1)
              public 'custom_response' => string '' (length=0)

您可以在此处进行测试：https://eval.in/571535

现在；让你回答id你可以简单地这样做：

    <?php

        $objData    = $objUnSerialized[0];
        $answerID   = $objData->answer_id;
        var_dump($answerID);  // DUMPS: '2'