Chukify - PHP utils to break function with large array parameter into multiple calls and combine the result

chunkify.php

<?php

class Helper {
  /**
   * Break up process for function with first large array parameter into multiple time and merge
   * Can be useful when thing are slow querying database or requesting api with large size of array at once
   */
  public static function chunkify(callable $fn, array $fnFirstParam = [], $chunkSize=1000, ...$fnRestParams) {
    $result = [];
    foreach (array_chunk($fnFirstParam, $chunkSize) as $chunk) {
      $result = array_merge($result, $fn($chunk, ...$fnRestParams));
    }
    return $result;
  }
}

example.php

<?php

class Report
{
  private $header = 'Amount';

  public function get($rawReport, $prefix, $separator) {
    return array_map($this->formatter($prefix, $separator), $rawReport);
  }

  private function formatter($prefix, $separator) {
    return function ($row) use ($prefix, $separator) {
      return $this->header . $prefix . $row . $separator;
    };
  }

}

// use it
$rawReport = ['a', 'b', 'c'];
$prefix =  ' : ';
$separator = '<br />';

$result = Helper::chunkify([new Report, 'get'], $rawReport, 1000, $prefix, $separator);
var_dump($result);

example2.php

<?php

class Call3rdPartyAPI
{
  public function getUsersInfo($userList) {
    // call api
    return $userList;  
  }
}

// let's say this 3rd party api has limit on calling this function on $userList with maximum length of 100
// and we have 1000 in our user list
$3rdPartyApiParamLimit = 100;
$result = Helper::chunkify([new Call3rdPartyAPI, 'getUsersInfo'], $1000UsersList, $3rdPartyApiParamLimit);