Answers:
通常,没有它会没事,但是您可以并且应该设置Content-Type标头:
<?PHP
$data = /** whatever you're serializing **/;
header('Content-Type: application/json');
echo json_encode($data);
如果不使用特定的框架,通常会允许一些请求参数来修改输出行为。通常,对于快速故障排除而言,不发送标头,或者有时将数据有效载荷print_r盯上它可能很有用(尽管在大多数情况下,它不是必需的)。
header('Content-type:application/json;charset=utf-8');
返回JSON的完整清晰的PHP代码很完整:
$option = $_GET['option'];
if ( $option == 1 ) {
$data = [ 'a', 'b', 'c' ];
// will encode to JSON array: ["a","b","c"]
// accessed as example in JavaScript like: result[1] (returns "b")
} else {
$data = [ 'name' => 'God', 'age' => -1 ];
// will encode to JSON object: {"name":"God","age":-1}
// accessed as example in JavaScript like: result.name or result['name'] (returns "God")
}
header('Content-type: application/json');
echo json_encode( $data );
根据手册上json_encode
的方法可以返回一个非字符串(false):
成功或
FALSE
失败时返回JSON编码的字符串。
发生这种情况时,echo json_encode($data)
将输出空字符串,这是无效的JSON。
json_encode
例如,false
如果其参数包含非UTF-8字符串,则将失败(并返回)。
应该在PHP中捕获此错误情况,例如:
<?php
header("Content-Type: application/json");
// Collect what you need in the $data variable.
$json = json_encode($data);
if ($json === false) {
// Avoid echo of empty string (which is invalid JSON), and
// JSONify the error message instead:
$json = json_encode(["jsonError" => json_last_error_msg()]);
if ($json === false) {
// This should not happen, but we go all the way now:
$json = '{"jsonError":"unknown"}';
}
// Set HTTP response status code to: 500 - Internal Server Error
http_response_code(500);
}
echo $json;
?>
然后,接收端当然应该知道jsonError属性的存在指示错误情况,应该相应地对其进行处理。
在生产模式下,最好只将一般错误状态发送给客户端,并记录更具体的错误消息以供以后调查。
charset
JSON 没有参数;请参阅tools.ietf.org/html/rfc8259#section-11末尾的注释:“没有为该注册定义'charset'参数。添加一个对合规接收者实际上没有影响。” (JSON必须按照tools.ietf.org/html/rfc8259#section-8.1作为UTF-8进行传输,因此指定将其编码为UTF-8有点多余。)
charset
从HTTP标头字符串中删除了冗余参数。
尝试使用json_encode对数据进行编码,并使用设置内容类型header('Content-type: application/json');
。
设置访问安全性也很好-只需将*替换为您希望能够访问它的域即可。
<?php
header('Access-Control-Allow-Origin: *');
header('Content-type: application/json');
$response = array();
$response[0] = array(
'id' => '1',
'value1'=> 'value1',
'value2'=> 'value2'
);
echo json_encode($response);
?>
这里有更多示例:如何绕过Access-Control-Allow-Origin?
一个简单的函数,返回带有HTTP状态代码的JSON响应。
function json_response($data=null, $httpStatus=200)
{
header_remove();
header("Content-Type: application/json");
http_response_code($httpStatus);
echo json_encode($data);
exit();
}
header_remove
,并明确设置http响应是一个好主意;虽然先设置状态再设置http_response似乎是多余的。可能还想exit
在末尾添加一条语句。我将您的函数与@trincot结合在一起:stackoverflow.com/a/35391449/339440
如果查询数据库并需要JSON格式的结果集,可以这样进行:
<?php
$db = mysqli_connect("localhost","root","","mylogs");
//MSG
$query = "SELECT * FROM logs LIMIT 20";
$result = mysqli_query($db, $query);
//Add all records to an array
$rows = array();
while($row = $result->fetch_array()){
$rows[] = $row;
}
//Return result to jTable
$qryResult = array();
$qryResult['logs'] = $rows;
echo json_encode($qryResult);
mysqli_close($db);
?>
为了帮助使用jQuery解析结果,请看一下本教程。
这是一个简单的PHP脚本,用于返回雄性雌性,并且用户ID作为json值将是您调用脚本json.php时的任何随机值。
希望这个帮助谢谢
<?php
header("Content-type: application/json");
$myObj=new \stdClass();
$myObj->user_id = rand(0, 10);
$myObj->male = rand(0, 5);
$myObj->female = rand(0, 5);
$myJSON = json_encode($myObj);
echo $myJSON;
?>
将域对象格式化为JSON的一种简单方法是使用Marshal Serializer。然后将数据传递给您,json_encode
并根据您的需要发送正确的Content-Type标头。如果您使用的是Symfony之类的框架,则无需手动设置标题。在那里,您可以使用JsonResponse。
例如,用于处理Javascript的正确Content-Type将为application/javascript
。
或者,如果您需要支持一些很旧的浏览器,最安全的选择是text/javascript
。
出于其他目的(例如移动应用),请使用application/json
Content-Type。
这是一个小例子:
<?php
...
$userCollection = [$user1, $user2, $user3];
$data = Marshal::serializeCollectionCallable(function (User $user) {
return [
'username' => $user->getUsername(),
'email' => $user->getEmail(),
'birthday' => $user->getBirthday()->format('Y-m-d'),
'followers => count($user->getFollowers()),
];
}, $userCollection);
header('Content-Type: application/json');
echo json_encode($data);
每当您尝试返回API的JSON响应时,否则请确保具有正确的标头,并且还应确保返回有效的JSON数据。
这是示例脚本,可帮助您从PHP数组或JSON文件返回JSON响应。
PHP脚本(代码):
<?php
// Set required headers
header('Content-Type: application/json; charset=utf-8');
header('Access-Control-Allow-Origin: *');
/**
* Example: First
*
* Get JSON data from JSON file and retun as JSON response
*/
// Get JSON data from JSON file
$json = file_get_contents('response.json');
// Output, response
echo $json;
/** =. =.=. =.=. =.=. =.=. =.=. =.=. =.=. =.=. =.=. =. */
/**
* Example: Second
*
* Build JSON data from PHP array and retun as JSON response
*/
// Or build JSON data from array (PHP)
$json_var = [
'hashtag' => 'HealthMatters',
'id' => '072b3d65-9168-49fd-a1c1-a4700fc017e0',
'sentiment' => [
'negative' => 44,
'positive' => 56,
],
'total' => '3400',
'users' => [
[
'profile_image_url' => 'http://a2.twimg.com/profile_images/1285770264/PGP_normal.jpg',
'screen_name' => 'rayalrumbel',
'text' => 'Tweet (A), #HealthMatters because life is cool :) We love this life and want to spend more.',
'timestamp' => '{{$timestamp}}',
],
[
'profile_image_url' => 'http://a2.twimg.com/profile_images/1285770264/PGP_normal.jpg',
'screen_name' => 'mikedingdong',
'text' => 'Tweet (B), #HealthMatters because life is cool :) We love this life and want to spend more.',
'timestamp' => '{{$timestamp}}',
],
[
'profile_image_url' => 'http://a2.twimg.com/profile_images/1285770264/PGP_normal.jpg',
'screen_name' => 'ScottMili',
'text' => 'Tweet (C), #HealthMatters because life is cool :) We love this life and want to spend more.',
'timestamp' => '{{$timestamp}}',
],
[
'profile_image_url' => 'http://a2.twimg.com/profile_images/1285770264/PGP_normal.jpg',
'screen_name' => 'yogibawa',
'text' => 'Tweet (D), #HealthMatters because life is cool :) We love this life and want to spend more.',
'timestamp' => '{{$timestamp}}',
],
],
];
// Output, response
echo json_encode($json_var);
JSON文件(JSON数据):
{
"hashtag": "HealthMatters",
"id": "072b3d65-9168-49fd-a1c1-a4700fc017e0",
"sentiment": {
"negative": 44,
"positive": 56
},
"total": "3400",
"users": [
{
"profile_image_url": "http://a2.twimg.com/profile_images/1285770264/PGP_normal.jpg",
"screen_name": "rayalrumbel",
"text": "Tweet (A), #HealthMatters because life is cool :) We love this life and want to spend more.",
"timestamp": "{{$timestamp}}"
},
{
"profile_image_url": "http://a2.twimg.com/profile_images/1285770264/PGP_normal.jpg",
"screen_name": "mikedingdong",
"text": "Tweet (B), #HealthMatters because life is cool :) We love this life and want to spend more.",
"timestamp": "{{$timestamp}}"
},
{
"profile_image_url": "http://a2.twimg.com/profile_images/1285770264/PGP_normal.jpg",
"screen_name": "ScottMili",
"text": "Tweet (C), #HealthMatters because life is cool :) We love this life and want to spend more.",
"timestamp": "{{$timestamp}}"
},
{
"profile_image_url": "http://a2.twimg.com/profile_images/1285770264/PGP_normal.jpg",
"screen_name": "yogibawa",
"text": "Tweet (D), #HealthMatters because life is cool :) We love this life and want to spend more.",
"timestamp": "{{$timestamp}}"
}
]
}
JSON Screeshot:
您可以使用这个小的PHP库。它发送标题,并给您一个易于使用的对象。
看起来像 :
<?php
// Include the json class
include('includes/json.php');
// Then create the PHP-Json Object to suits your needs
// Set a variable ; var name = {}
$Json = new json('var', 'name');
// Fire a callback ; callback({});
$Json = new json('callback', 'name');
// Just send a raw JSON ; {}
$Json = new json();
// Build data
$object = new stdClass();
$object->test = 'OK';
$arraytest = array('1','2','3');
$jsonOnly = '{"Hello" : "darling"}';
// Add some content
$Json->add('width', '565px');
$Json->add('You are logged IN');
$Json->add('An_Object', $object);
$Json->add("An_Array",$arraytest);
$Json->add("A_Json",$jsonOnly);
// Finally, send the JSON.
$Json->send();
?>