尝试使用php从json获取数据时，不会返回任何结果

下午好

我目前在用PHP从json文件获取数据时遇到问题

我现在得到的是

$jsondecoded = json_decode('[{"chat":{"username":"RobloxProtectorKing","message":":slender me","time":"2018-03-20 01:56:12"}}', true);

echo ($jsondecoded[0]->chat);

如你所见。我正在尝试获取聊天信息。但是，当我尝试这样做时，它没有任何回应。我一直在试图找出原因，但遗憾的是我找不到。我一定错过了什么，但我不知道我错过了什么

高级版谢谢。

三个错误：

1） json结尾处缺少]

2） 您正在使用json_decode的“array assoc”选项，因此它不会返回对象

3） 您不能回显聊天对象

试试这个：

$jsondecoded = json_decode('[{"chat":{"username":"RobloxProtectorKing","message":":slender me","time":"2018-03-20 01:56:12"}}]');

echo ($jsondecoded[0]->chat->username);

另外，请记住，您使用了

true

作为

json_decode

的第二个参数，这意味着您要将结果转换为关联数组，请删除该

true

或将访问权限更改为：

var_dump($jsondecoded[0]['chat']);

---

您的json在json字符串的末尾添加']'无效，并且php中的打印数组使用print_r函数[0]'用于获取第一个元素，['chat']用于获取聊天键的值

$jsondecoded = json_decode('[{"chat":{"username":"RobloxProtectorKing","message":":slender me","time":"2018-03-20 01:56:12"}}]', true);

print_r ($jsondecoded[0]['chat']);

输出将像

Array
(
    [username] => RobloxProtectorKing
    [message] => :slender me
    [time] => 2018-03-20 01:56:12
)

---

下面是我的一个模板示例。希望能有帮助

<?php
/* Status Codes

return 0 = Nothing to Update (n/a)
return 1 = Successful Insert Query
return 2 = Database Connection refused
return 3 = MySQL Query Error OR Wrong URL Parameters */

/* Disable Warnings so that we can return ONLY what we want through echo. */
mysqli_report(MYSQLI_REPORT_STRICT);

// First get raw POST input
$raw_post     = file_get_contents('php://input');
// Run through url_decode..
$url_decoded  = urldecode($raw_post);
// Run through json_decode...
// false to allow for reference to oject. eg. $column->name instead of $column["name"] in the foreach.
$json_decoded = json_decode($url_decoded, false);

$pk_line_item_id  = (strlen($json_decoded[0]->value)  > 0 ? $json_decoded[0]->value : null);

// INCLUDE DB CONNECTION STRING
include 'php_pdo_mysql_connect.php';

// SQL INSERT query...
$stmt = $link->prepare(" SELECT * FROM tbl_xyz ");

//$stmt->bindParam(':pk_line_item_id', $pk_line_item_id, PDO::PARAM_INT);   // INT

// Execute this SQL statement.
$stmt->execute();

// Fetch & Populate the single returned in var $resultSet.
$resultSet = $stmt->fetchAll(); 
// Returns an array indexed by column number as returned in your result set, starting at column 0. 
// https://www.ibm.com/support/knowledgecenter/en/SSEPGG_9.7.0/com.ibm.swg.im.dbclient.php.doc/doc/t0023505.html

// If the search record was found, populate it on the html table.
if (($resultSet !== false) && ($stmt->rowCount() > 0)) {

// Set JSON headers
header('Content-type:application/json;charset=utf-8');

// Encode entire $resultSet array to JSON.
$json_encoded = json_encode($resultSet);
// Ready to return as JSON to client side JQuery / Java Script...

echo $json_encoded;

}

?>

无效的json，结尾缺少

]

。遗憾的是，这不是问题所在。我修复了它，同样的事情也发生了。4）

echo

是一个构造，不需要用括号括起来。哇。真不敢相信我会错过这么简单的事情。谢谢迪奥尼的帮助，将来会非常有用的。

<?php
/* Status Codes

return 0 = Nothing to Update (n/a)
return 1 = Successful Insert Query
return 2 = Database Connection refused
return 3 = MySQL Query Error OR Wrong URL Parameters */

/* Disable Warnings so that we can return ONLY what we want through echo. */
mysqli_report(MYSQLI_REPORT_STRICT);

// First get raw POST input
$raw_post     = file_get_contents('php://input');
// Run through url_decode..
$url_decoded  = urldecode($raw_post);
// Run through json_decode...
// false to allow for reference to oject. eg. $column->name instead of $column["name"] in the foreach.
$json_decoded = json_decode($url_decoded, false);

$pk_line_item_id  = (strlen($json_decoded[0]->value)  > 0 ? $json_decoded[0]->value : null);

// INCLUDE DB CONNECTION STRING
include 'php_pdo_mysql_connect.php';

// SQL INSERT query...
$stmt = $link->prepare(" SELECT * FROM tbl_xyz ");

//$stmt->bindParam(':pk_line_item_id', $pk_line_item_id, PDO::PARAM_INT);   // INT

// Execute this SQL statement.
$stmt->execute();

// Fetch & Populate the single returned in var $resultSet.
$resultSet = $stmt->fetchAll(); 
// Returns an array indexed by column number as returned in your result set, starting at column 0. 
// https://www.ibm.com/support/knowledgecenter/en/SSEPGG_9.7.0/com.ibm.swg.im.dbclient.php.doc/doc/t0023505.html

// If the search record was found, populate it on the html table.
if (($resultSet !== false) && ($stmt->rowCount() > 0)) {

// Set JSON headers
header('Content-type:application/json;charset=utf-8');

// Encode entire $resultSet array to JSON.
$json_encoded = json_encode($resultSet);
// Ready to return as JSON to client side JQuery / Java Script...

echo $json_encoded;

}

?>