Question

您好我正在使用foreach循环来解析每行json数据..

完全我正在尝试从视图中获取json数据，然后将其发送到控制器，我将解析json的每一行以将其插入到我的数据库中..我正在尝试通过将数据放入循环并调用模型中存在的setCurrentAttendance（$ item）来插入数据。如果我的方法有误，请让我知道正确的方法..

php代码是：

$data = json_decode($_POST["json"]); 

        var_dump($data);

        foreach($data as $item){
            $this->codegen_model->setCurrentAttendance($item);
        }

注意

$this->codegen_model->setCurrentAttendance($item);

重定向到我的模型，我试图将$ item作为数组传递并将其插入数据库..

function setCurrentAttendance($data){
        $this->db->insert('table_name', $data); 
        if ($this->db->affected_rows() >= '1')
        {
            return TRUE;
        }

        return FALSE;
    }

json数据变量$ data是：

  "[{"roll_no":"1101","full_name":"John Smith","dayspresent":"1","totalclasses":"2","percent_att":"50","hasAttended":"P","att_date":"Thu Apr 04 2013","st_class":"1","st_section":"A"},
{"roll_no":"1102","full_name":"Ram Puri","dayspresent":"4","totalclasses":"4","percent_att":"100","hasAttended":"P","att_date":"Thu Apr 04 2013 ","st_class":"1","st_section":"A"}]"

但我收到以下错误而无法猜出为什么？

<div style="border:1px solid #990000;padding-left:20px;margin:0 0 10px 0;">

<h4>A PHP Error was encountered</h4>

<p>Severity: Warning</p>
<p>Message:  Invalid argument supplied for foreach()</p>
<p>Filename: controllers/controller_name.php</p>
<p>Line Number: 245</p>

</div>

请告诉我错误的地方。

提前致谢。

更新

json编码数据：

"[{\"roll_no\":\"1101\",\"full_name\":\"John Smith\",\"dayspresent\":\"1\",\"totalclasses\":\"2\",\"percent_att\":\"\n\t\t\t50\t\t\t\",\"hasAttended\":\"P\",\"att_date\":\"Fri Apr 05 2013 \",\"st_class\":\"1\",\"st_section\":\"A\"},{\"roll_no\":\"1102\",\"full_name\":\"Ram Puri\",\"dayspresent\":\"4\",\"totalclasses\":\"4\",\"percent_att\":\"\n\t\t\t100\t\t\t\",\"hasAttended\":\"A\",\"att_date\":\"Fri Apr 05 2013 \",\"st_class\":\"1\",\"st_section\":\"A\"}]"

Answer 1

您的JSON字符串无效。它中包含\t和\n，但它不应该。你必须先过滤掉那些：

$json = str_replace(array("\t","\n"), "", $_POST["json"]);
$data = json_decode($json); 

var_dump($data);

foreach($data as $item)
{
  $this->codegen_model->setCurrentAttendance($item);
}

请参阅：this works。

Answer 2

请使用此代码。它可能适合你。

修改

代码更新以打印每个学生的全名作为示例。

<?php $data = '{"students" : [{"roll_no":"1101","full_name":"John Smith","dayspresent":"1","totalclasses":"2","percent_att":"50","hasAttended":"P","att_date":"Fri Apr 05 2013 ","st_class":"1","st_section":"A"},{"roll_no":"1102","full_name":"Ram Puri","dayspresent":"4","totalclasses":"4","percent_att":"100","hasAttended":"A","att_date":"Fri Apr 05 2013 ","st_class":"1","st_section":"A"}]}'; $data = json_decode($data); //var_dump($data); foreach($data->students as $item){ print $item->full_name; } ?>

Codeigniter - 解析每一行json数据

2 个答案: