您可以使用这个小型PHP库。它发送头文件并给你一个容易使用它的对象。

它看起来是这样的:

<?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();
?>

尝试json_encode对数据进行编码，并设置带有header的content-type (' content-type: application/json');

这个问题有很多答案，但没有一个涵盖了返回干净JSON的整个过程，以及防止JSON响应变形所需的一切。

/*
 * returnJsonHttpResponse
 * @param $success: Boolean
 * @param $data: Object or Array
 */
function returnJsonHttpResponse($success, $data)
{
    // remove any string that could create an invalid JSON 
    // such as PHP Notice, Warning, logs...
    ob_clean();

    // this will clean up any previously added headers, to start clean
    header_remove(); 

    // Set the content type to JSON and charset 
    // (charset can be set to something else)
    header("Content-type: application/json; charset=utf-8");

    // Set your HTTP response code, 2xx = SUCCESS, 
    // anything else will be error, refer to HTTP documentation
    if ($success) {
        http_response_code(200);
    } else {
        http_response_code(500);
    }
    
    // encode your PHP Object or Array into a JSON string.
    // stdClass or array
    echo json_encode($data);

    // making sure nothing is added
    exit();
}

引用:

response_remove

ob_clean

JSON内容类型

HTTP规范

http_response_code

json_encode

返回JSON的完整的PHP代码如下:

$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 );

一个返回带有HTTP状态代码的JSON响应的简单函数。

function json_response($data=null, $httpStatus=200)
{
    header_remove();

    header("Content-Type: application/json");

    http_response_code($httpStatus);

    echo json_encode($data);

    exit();
}

如上所述:

header('Content-Type: application/json');

会完成这项工作。但请记住:

即使没有使用这个报头，Ajax读取json也没有问题，除非您的json包含一些HTML标记。在这种情况下，您需要将头文件设置为application/json。 确保您的文件不是用UTF8-BOM编码的。这种格式在文件顶部添加了一个字符，因此header()调用将失败。