xtu_mall/app/admin/validate/cms/ModelField.php

<?php
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// | 模型验证
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namespace app\admin\validate\cms;

use think\Validate;

class ModelField extends Validate
{
    //定义验证规则
    protected $rule = [
        'name|字段名称'           => 'require|regex:/^[a-zA-Z][A-Za-z0-9\_]+$/',
        'title|字段标题'          => 'require',
        'type|字段类型'           => 'require|alphaDash',
        'setting.define|字段定义' => 'require',
        'ifsystem|主表字段'       => 'in:0,1',
        'ifrequire|是否必填格'     => 'in:0,1',
        'ifsearch|是否显示搜索'     => 'in:0,1',
        'status|字段状态'         => 'in:0,1',
    ];

    //定义验证提示
    protected $message = [
        'name.regex' => '字段名称只能为字母、数字和下划线_，并且仅能字母开头',
    ];
}