php输出json数据

<?php
// 创建一个关联数组
$data = array(
    "name" => "John Doe",
    "age" => 30,
    "city" => "New York"
);

// 设置正确的Content-Type头部
header('Content-Type: application/json');

// 将数组转换为JSON格式并输出
echo json_encode($data);
?>

$data = array(
    "name" => "John Doe",
    "age" => 30,
    "city" => "New York"
);

header('Content-Type: application/json; charset=utf-8');

echo json_encode($data, JSON_UNESCAPED_UNICODE);

$data = array(
    "name" => "John Doe",
    "age" => 30,
    "city" => "New York"
);

if (empty($data)) {
    echo json_encode(array("error" => "No data to output"));
} else {
    header('Content-Type: application/json');
    echo json_encode($data);
}

fetch('your-php-script.php')
    .then(response => response.json())
    .then(data => {
        console.log(data);
    })
    .catch(error => {
        console.error('Error parsing JSON:', error);
    });