I would suggest using wget ([URL=http://]www.gnu.org/software/wget/wget.html[/URL]), sed ([URL=http://]www.cornerstonemag.com/sed/[/URL]), grep ([URL=http://]www.gnu.org/software/grep/grep.html[/URL]), and/or awk ([URL=http://]www.canberra.edu.au/~sam/whp/awk-guide.html[/URL])
If you need to use just PHP check out these functions for reading files: fgetss(), fgets(), fopen(), fsockopen(), popen(), strip_tags(), fread(), fgetc(), stream_get_line(), and socket_set_timeout().
You will also need PHP Regular Expression Functions ([URL=http://]us4.php.net/manual/en/ref.pcre.php[/URL]) for pattern matching.
Basicaly you just need to open the file, read through it line by line and pull the data out using a combination of line numbers, or matching strings.
$fp = fopen('http://www.website.com/page.html','r'); // open the file
while (!feof($fp)){
$content .= fread($fp,150000); // loop through the file and adding each line to $content
}
fclose($fp); // close the file
$exp = "blah blah blah"; // regular expresion to match whatever between this and that
$match = preg_match_all($exp,$content,$matches); // search $content for all matches to $exp and add them to array $matches
if ($match) {
for($i=0;$i<=count($matches);$i++)
echo strip_tags($matches[0][$i]); // print each match
}
