Sorts Apache HTTP logs for multiple servers behind a load balancer

ApacheLogSorter.php

<?php
// Created on 2016 April 6th @ 05:03 PM
if (count($argv) > 1) {
	$filename = $argv[1];
} else {
	error_log('No filename provided.');
	exit();
}

$file = fopen($filename, 'r');

$lines = array();
while (($line = fgets($file)) !== false) {
	$begin = strpos($line, ':[');
	$end = strpos($line, ']', $begin + 2);
	$date = substr($line, $begin + 2, ($end - $begin - 2));
	
	/* @var $dt \DateTime */
	$dt = \DateTime::createFromFormat('D M d H:i:s.u Y', $date);
	$iso8601 = $dt->format('Y-m-d H:i:s');
	
	$lines[$iso8601] = $line;
}

ksort($lines);

foreach ($lines as $date => $line) {
	echo $line;
}

fclose($file);