formの間違い例

array.php

<?php
            //動かない例
            [
                "content" => [
                    "type" => "input",
                    "text" => "入力してください",
                ],
            ];
            //動く例
            [
                "content" => [
                    [
                        "type" => "input",
                        "text" => "入力してください",
                    ],
                ],
            ];