如何使用PHP创建JSON数组

我的JSON数据如下所示：

[
    {
        "email":"test@test.com",
        "firstName":"test",
        "lastName":"test",
        "value":"test@test.com",
        "tokens":"test@test.com"
    },
    {
        ...
    }
]

<?php
    session_start();
    include('connection.php');
    $userId = $_SESSION['sess_user_id'];
    $act = $_POST['action'];
    $sth = mysql_query("SELECT email, firstName, lastName, email AS value, email AS tokens FROM User");
    $rows = array();
    while($r = mysql_fetch_assoc($sth))
    {
        $rows[] = $r;
    }
    $fp = fopen('./test.json', 'w');
    fwrite($fp, json_encode($rows));
    fclose($fp);
?>

[
    {
        "email":"test@test.com",
        "firstName":"test",
        "lastName":"test",
        "value":"test@test.com",
        "tokens":[
            "test@test.com"
        ]
    }
]

用于创建json文件的php数据如下所示：

[
    {
        "email":"test@test.com",
        "firstName":"test",
        "lastName":"test",
        "value":"test@test.com",
        "tokens":"test@test.com"
    },
    {
        ...
    }
]

<?php
    session_start();
    include('connection.php');
    $userId = $_SESSION['sess_user_id'];
    $act = $_POST['action'];
    $sth = mysql_query("SELECT email, firstName, lastName, email AS value, email AS tokens FROM User");
    $rows = array();
    while($r = mysql_fetch_assoc($sth))
    {
        $rows[] = $r;
    }
    $fp = fopen('./test.json', 'w');
    fwrite($fp, json_encode($rows));
    fclose($fp);
?>

[
    {
        "email":"test@test.com",
        "firstName":"test",
        "lastName":"test",
        "value":"test@test.com",
        "tokens":[
            "test@test.com"
        ]
    }
]

我希望my JSON文件如下所示：

[
    {
        "email":"test@test.com",
        "firstName":"test",
        "lastName":"test",
        "value":"test@test.com",
        "tokens":"test@test.com"
    },
    {
        ...
    }
]

<?php
    session_start();
    include('connection.php');
    $userId = $_SESSION['sess_user_id'];
    $act = $_POST['action'];
    $sth = mysql_query("SELECT email, firstName, lastName, email AS value, email AS tokens FROM User");
    $rows = array();
    while($r = mysql_fetch_assoc($sth))
    {
        $rows[] = $r;
    }
    $fp = fopen('./test.json', 'w');
    fwrite($fp, json_encode($rows));
    fclose($fp);
?>

[
    {
        "email":"test@test.com",
        "firstName":"test",
        "lastName":"test",
        "value":"test@test.com",
        "tokens":[
            "test@test.com"
        ]
    }
]

---

我想弄明白，但我做不到。请提供帮助？

php处理的数组与javascript不同（后者区分对象和数组）

应该这样做。

为什么

[]

表示“数组”，它看起来不像

电子邮件

的值大于1。