Subtitle synchroniser. Goes through the .srt file and edits the hh:mm:ss --> hh:mm:ss as per the user's specificatoins.

srt_synch.php

<?php
$begin = microtime(TRUE);

$args = parse_argv($argv);

echo PHP_EOL.'Processing the file...'.PHP_EOL;

$contents = file($args['in'], FILE_IGNORE_NEW_LINES);
$difference = $args['diff'];
$out = isset($args['out']) ? $args['out'] : $args['in'];
$count = 0;


foreach($contents as &$line)
{
	if(strpos($line, '-->') === FALSE)
	{
		continue;
	}
	
	$count++;
	list($from, $to) = array_map('trim', explode('-->', $line));
	
	$from_time = substr($from, 0, 8);
	$to_time = substr($to, 0, 8);
	
	$synched_from_time = date('H:i:s', strtotime($from_time) + $difference);
	$synched_to_time = date('H:i:s', strtotime($to_time) + $difference);
	
	$line = str_replace(array($from_time, $to_time), array($synched_from_time, $synched_to_time), $line);
}

file_put_contents($out, implode(PHP_EOL, $contents));
$end = microtime(TRUE);

echo 'Subtitle processed successfully, synched '.$count.' lines in '.($end - $begin).' seconds'.PHP_EOL;


function parse_argv(array $argv)
{
	$argc = sizeof($argv);
	$return = array();
	if($argc == 1 || !in_array('--in', $argv) || !in_array('--diff', $argv))
	{
		printf('Usage : php %s --in in.srt --diff time_in_seconds [-- out out.srt]%s', basename(__FILE__), "\n");
		exit;
	}
	for($i = 1; $i < $argc; $i += 2)
	{
		list($arg, $val) = array($argv[$i], $argv[$i + 1]);
		switch($arg)
		{
			case '--in':
			$return['in'] = $val;
			break;
			
			case '--diff':
			$return['diff'] = $val;
			break;
			
			case '--out':
			$return['out'] = $val;
			break;
		}
	}
	
	if(!is_readable($return['in']))
	{
		printf('%s is not readable, aborting...%s', basename($return['in']), PHP_EOL);
		die;
	}
	elseif(isset($return['out']))
	{
		if(file_exists($return['out']) && !is_writable($return['out']))
		{
			printf('%s is not writable, aborting...%s', basename($return['out']), PHP_EOL);
			die;
		}
		else
		{
			if(touch($return['out']) === FALSE)
			{
				printf('Failed to create %s, aborting...%s', basename($return['out']), PHP_EOL);
				die;
			}
		}
	}
	elseif(!isset($return['out']) && !is_writable($return['in']))
	{
		printf('%s is not writable, aborting...%s', basename($return['in']), PHP_EOL);
		die;
	}
	
	return $return;
}
?>