prepaid.php

<?php

$files = glob('/Users/wgilk/Desktop/calls/*.csv');

$data = array();

foreach ($files as $file)
{
	$csv = fopen($file, 'r');

	$cols = fgetcsv($csv);

	while ($line = fgetcsv($csv))
	{
		$line = array_combine($cols, $line);

		$date = strtotime($line['Date']);

		$set =& $data[date('n', $date)][date('j', $date)];

		$set += $line['Minutes'];
	}
}

array_shift($data);
array_pop($data);

echo '<dl>';
foreach ($data as $month => $days)
{
	echo '<dt>Days: ', $d = count($days), ' – Minutes: ', $m = array_sum($days),'</dt>';

	echo "<dd>$1/day + $0.10/min: $", number_format($d + ($m * 0.10), 2), '</dd>';
	echo "<dd>$0.25/min: $", number_format($m * 0.25, 2), '</dd>';
	echo "<dd>$3/day: $", number_format($d * 3, 2), '</dd>';

}
echo '</dl>';