Php 从mysqli准备的语句创建数组

我有一个简单的脚本，我试图理解为什么它不起作用，以及如何得到我想要的

我想要得到的是一个数组，称它为

$results

，并将数据存储如下

$results ->
    $row1 ->
        $field1
        $field2
        $field3
        $field4
        $field5
    $row2 ->
        $field1
        $field2
        $field3
        $field4
        $field5

等等

但我甚至不能让mysqli循环出结果，这是我的代码

require_once ('lib/constants.php');
$mysqli = new mysqli(DB_SERVER, DB_USER, DB_PASSWORD, DB_NAME) or die('Error connecting to Database.');

$query = "SELECT * FROM employees LIMIT 0, 20";

if($stmt = $mysqli->prepare($query)) {
$stmt->execute();
$row = array();
stmt_bind_assoc($stmt, $row);

while($stmt->fetch()) {
    var_dump($row);
}
}

请检查PHP.net上的方法以便更好地理解

下面是一个简单的例子

require_once ('lib/constants.php');
$mysqli = new mysqli(DB_SERVER, DB_USER, DB_PASSWORD, DB_NAME) or die('Error connecting to Database.');

$query = "SELECT * FROM employees LIMIT 0, 20";

if ($result = $mysqli->query($query)) {

    /* fetch associative array */
    while ($row = $result->fetch_assoc()) {
        echo $row['myfield'];
    }

    /* free result set */
    $result->free();
}

您应该检查而不是mysqli\u result:：fetch\u assoc

$query = "SELECT * FROM employees LIMIT 0, 20";

if ($result = $mysqli->query($query)) {
    $array_assoc = $result->fetch_all();

    /* free result set */
    $result->close();
}