php获取json数据

<?php
// 假设这是从某个API获取的JSON数据
$json_data = '{"name":"John","age":30,"city":"New York"}';

// 解码JSON数据为PHP对象
$person = json_decode($json_data);

// 访问解码后的数据
echo $person->name; // 输出: John
echo $person->age;  // 输出: 30
echo $person->city; // 输出: New York

// 如果需要将PHP数组编码为JSON
$person_array = array(
    'name' => 'John',
    'age' => 30,
    'city' => 'New York'
);
$json_output = json_encode($person_array);
echo $json_output; // 输出: {"name":"John","age":30,"city":"New York"}
?>

$json_data = '{"name":"John","age":30,"city":"New York"}';

// 检查JSON字符串是否有效
if (json_last_error() === JSON_ERROR_NONE) {
    $person = json_decode($json_data);
    if ($person !== null) {
        // 成功解码
    } else {
        echo "JSON数据解码失败";
    }
} else {
    echo "无效的JSON字符串";
}

$person_array = array(
    'name' => 'John',
    'age' => 30,
    'city' => 'New York'
);

$json_output = json_encode($person_array);
if ($json_output === false) {
    echo "JSON编码失败: " . json_last_error_msg();
} else {
    echo $json_output;
}