Create an array from a CSV with headers as array keys.

csv-to-array.php

<?php

  if ( (isset($_POST['submit'])) && (!empty($_POST['submit'])) && (! empty($_FILES['csv_upload']['name'])) ): 
        /**
         * Map CSV items to rows.
         * @see php.net/array_map
         * @see php.net/file
         */
        $rows = array_map('str_getcsv', file($_FILES['csv_upload']['tmp_name']));

        /**
         * Map CSV headers to keys. (while simultaneously stripping them from our $rows array) 
         * @see php.net/array_shift
         */
        $keys = array_shift($rows);

        // Create a collection.
        $collection = [];
        // Create a data mapper.
        $dataMapper = [];

        // Start by looping through keys and:
        // - Create a Data Map for Indeces to Keys
        foreach ($keys as $index => $key):
            // make the key a bit more machine readable.
            $safeKey = strtolower(str_replace(' ', '_', $key));
            // remove anything in brackets.
            $safeKey = str_replace('_(kg/g)', '', $safeKey);
            // Push to dataMapper.
            $dataMapper[$index] = $safeKey;
        endforeach;

        // Loop through the rows (which don't have keys any more..).
        foreach ($rows as $row):
            /**
             * Combine the Data Mapper with the Row
             * @see php.net/array_combine
             */
            if (count($dataMapper) === count($row)):
                // Create Item with Keys and Values
                $item = array_combine($dataMapper, $row);
                // Push to our Users Collection
                array_push($collection, $item);
            endif;
        endforeach;
    endif;