<?php
$file = fopen('test.txt', 'r');

$start = microtime(true);
$records = 0;
while ($line = fgets($file)) {
	list($timestamp, $event, $args) = explode(':', $line, 3);
	$args = parse_csv($args);

	$records++;
}

fclose($file);


$sec_duration = microtime(true) - $start;
$rps = number_format($records / $sec_duration, 2);
echo "$records processed in $sec_duration seconds at $rps records per second\r\n";

// returns an array of parsed csv data
function parse_csv($str) {
	$a = array();
	$quotes = false;
	$cur_val = "";
	$len = strlen($str);

	for ($i = 0; $i < $len; $i++) {
		$c = $str[$i];

		switch ($c) {
			case '"':
				if ($i < ($len - 1) && $str[$i + 1] == '"') {
					$cur_val .= '"';
					$i++;
				} else {
					$quotes = !$quotes;
				}

				break;
			case ',':
				if ($quotes) {
					$cur_val .= $c;
				} else {
					$a[] = $cur_val;
					$cur_val = "";
				}

				break;
			default:
				$cur_val .= $c;
		}
	}

	$a[] = $cur_val;

	return $a;
}