Laravel验证用户名不能以特定字符串开头

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class UsernamePrefix implements Rule
{
    protected $prefix;

    public function __construct($prefix)
    {
        $this->prefix = $prefix;
    }

    public function passes($attribute, $value)
    {
        return !str_starts_with($value, $this->prefix);
    }

    public function message()
    {
        return 'The :attribute cannot start with '.$this->prefix;
    }
}

use App\Rules\UsernamePrefix;
use Illuminate\Support\Facades\Validator;

$validator = Validator::make($request->all(), [
    'username' => ['required', 'string', new UsernamePrefix('admin')],
]);

if ($validator->fails()) {
    // 验证失败，处理错误逻辑
} else {
    // 验证通过，继续处理其他逻辑
}