Excel Validation Rule

ExcelRule.php

<?php

namespace App\Rules\API;

use Illuminate\Contracts\Validation\Rule;

class ExcelRule implements Rule
{
    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        return $this->checkExcelFile($value->getClientOriginalExtension());
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'The file must be a file of type: csv, xlsx, xls';
    }


    /**
     * Check if file is a valid spreadsheet
     */
    public function checkExcelFile($file_ext)
    {
        $valid = [
            'csv', 'xls', 'xlsx' // add your extensions here.
        ];
        return in_array($file_ext, $valid) ? true : false;
    }
}