bot-28/app/Rules/DecimalNumber.php

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class DecimalNumber implements Rule
{
    public function __construct(private int $integerDigits = 14, private int $decimalPlaces = 4)
    {
    }

    public function passes($attribute, $value): bool
    {
        if (!is_string($value) && !is_int($value) && !is_float($value)) {
            return false;
        }
        return preg_match(
            '/^\d{1,' . $this->integerDigits . '}(?:\.\d{1,' . $this->decimalPlaces . '})?$/D',
            (string) $value
        ) === 1;
    }

    public function message(): string
    {
        return ':attribute 格式错误，最多 ' . $this->integerDigits . ' 位整数和 ' . $this->decimalPlaces . ' 位小数';
    }
}