Start by creating a new instance of ExcelToCoorindates class:

$excel_to_cordinates = new ExcelToCoordinates();

        ->setExcelPath(__DIR__ . "/../example/addresses.xlsx") // (required)  path to the excel file
        ->setAddressIterator('A') // (required) The address iterator, for better understanding please check the example excel file provided in /example
        ->setPostCodeIterator('B') // (required) The Post Code Iterator 
        ->setCountryIterator('C') // (required) The country Iterator
        ->setGoogleApiCode('') // (required) Google API Key
        ->setStartRow(1) // (required) row from where you want to start 
        ->setEndRow(2) // (required) row where converting will stop
        ->loadData() // (required) main function which will return array of geo coordinates

`composer require cirkovic/excel-to-coordinates`

* php 7.4
* ext-json