データベースのスキーマからバリデーションルールを出すやつ

genValidationRules.php

<?php
// CC0 とします。好き勝手にするといいよ！

const USER = "UserName";
const PASS = "YourP@ssW0rd!";
const HOST = "localhost";

const TABLE = "some_table";

try{
    $pdo = new PDO('mysql:dbname=information_schema;host='.HOST.';port=3306', USER, PASS);

    $res = $pdo->query("select COLUMN_NAME,CHARACTER_MAXIMUM_LENGTH from information_schema.COLUMNS where TABLE_NAME = '".TABLE."' and DATA_TYPE = 'varchar'");

    $res->execute();

    foreach($res->fetchAll() as $row){
        echo <<<DOC
'{$row['COLUMN_NAME']}' => [
    'max:{$row['CHARACTER_MAXIMUM_LENGTH']}',
],

DOC;
    }
    
}catch(PDOException $e){
    exit($e->getMessage());
}