json数据转换为php变量

Question

我必须使用PHP解析这个json数据并将值存储到PHP变量中.

{  
"sender": "am@email.com",  
"receiver": "ak@email.com",  
"msg_id": "msg1_am@email.com",   
"subject": "Group Discussion",   
"references": ["msg1_aman@email.com","msg1_s@email.com","msg1_v@email.com"]
}

我正在使用这个PHP代码,它无法正常工作; 请检查一下.

对于字段'sender','receiver','msg_id'和'subject,我正在使用PHP变量'$ msg_id','$ sender','$ receiver'和'$ subject'.
我试图在数组'ref_id'中存储'references'的数据.

此外,文件'dataset_f.json'具有以下方式的内容:

{ "sender":"aman@email.com","receiver":"akash@email.com","msg_id":"msg1_aman@email.com","subject": "Project Discussion","references":["msg1_aman@email.com","msg1_s@email.com","msg1_v@email.com"]}

{ "sender":"akash@email.com","receiver":"aman@email.com","msg_id":"msg1_akash@email.com","subject": "Project Discussion","references":["msg1_aman@email.com","msg1_s@email.com","msg1_v@email.com"]}

这就是为什么php代码逐行读取文件

<?php
$h1 = fopen("dataset_f.json", "r");
while(!feof($h1)){
$line = fgets($h1);
$test_case = json_decode($line);

$ref_id = array();
$msg_id = $test_case->{'msg_id'};
$sender = $test_case->{'sender'};
$receiver = $test_case->{'receiver'};
$subject = $test_case->{'subject'};
foreach($test_case as $val)
 {
    foreach($val -> references as $refer)
    {
        array_push($ref_id, $refer->ref);
    }
 }

// printing the values
$arrlen=count($ref_id);
 for($x=0;$x<$arrlen;$x++)
 { echo $ref_id[$x]." "; }
echo $msg_id." ".$sender." ".$receiver." ".$subject." <br> ";

}
?>

Answer 1

将整个文件存储为字符串,对其进行解码并将值存储在变量中.显示您使用的json.你使用 - >不正确,那对象不是数组,如果下一个参数为真,json_decode()会返回一个关联数组.ref_id将保存以逗号分隔的字符串.

dataset_f.json

{
    "sender":"am@email.com",
    "receiver":"ak@email.com",
    "msg_id":"msg1_am@email.com",
    "subject":"Group Discussion",
    "references":["msg1_aman@email.com","msg1_s@email.com","msg1_v@email.com"]
}

PHP代码

$json = file_get_contents("dataset_f.json");

$data = json_decode($json, true);

// here depends on the json

$ref_id = ( ( is_array( $data["references"] ) ? implode(", ", $data["references"]) : $data["references"] ) ); // array to string
$msg_id = $data["msg_id"];
$sender = $data["sender"];
$receiver = $data["receiver"];
$subject = $data["subject"];