PHPС将字符串转换为带有键的嵌套数组

<?php
$jsonString = '{"name": "John", "age": 30, "cars": [{"model": "BMW 230", "mpg": 27.5}, {"model": "Ford Edge", "mpg": 24.1}]}';

// 使用json_decode函数将JSON字符串转换为PHP数组
$array = json_decode($jsonString, true);

print_r($array);
?>

Array
(
    [name] => John
    [age] => 30
    [cars] => Array
        (
            [0] => Array
                (
                    [model] => BMW 230
                    [mpg] => 27.5
                )

            [1] => Array
                (
                    [model] => Ford Edge
                    [mpg] => 24.1
                )

        )

)

$array = json_decode($jsonString, true);
if ($array === null && json_last_error() !== JSON_ERROR_NONE) {
    echo 'JSON解析错误: ' . json_last_error_msg();
}