Simple PHP Script allows you to handle uploaded CSV files w/ empty columns/headers

handle_csv.php

<?php
$file = file($_FILES['file-name']['tmp_name']);

$csv_rows = array_map('str_getcsv', file($_FILES['customer-csv']['tmp_name']));
$csv_header = array_filter(array_shift($csv_rows));
$merged = [];
foreach($csv_rows as $row) {
    $row = array_filter($row);
    while(count($row) !== count($csv_header)) {
	if(count($row) > count($csv_header)) {
	    unset($row[count($row) - 1]);
	}
	else {
	    $row[count($row) + 1] = null;
	}
    }
    
    $merged[] = array_combine($csv_header, $row);
}

I am aware some optimizations could be made.