the biggest addition to php5 is object oriented programming aspects, specifically it acts more like java (exception handling, etc.))

"$ php wordwrap.php < input.txt > output.txt

Inside your script, however, you don't know about input.txt and output.txt. You only know that you're to process data from php://stdin and print the results to php://stdout. This allows you to create a generalized script that works in conjunction with other command-line tools.

To read from standard input, do this:

$stdin = file_get_contents('php://stdin');

To write to standard output, do this:

file_put_contents('php://stdout', $data);

This simple script rewraps text to 10 characters:

$stdin = file_get_contents('php://stdin');

$data = wordwrap($stdin, 10);

file_put_contents('php://stdout', $data);"

tidy class cleans up html!