UNSW ProgComp: Problem 3 - 2007

<?php

$input = <<<END
10 15
Time
flies
like
an
arrow
but
fruit
flies
like
a
banana
Groucho
Marx
END;

//number of word, width
$input = explode("\n", $input);
$first_line = explode(" ", array_shift($input));
$width = $first_line[1];
//ignore the word count

foreach($input as $key => $value){
    $echo_key = $key+1;
    echo str_pad($value, $width-strlen($echo_key), '.', STR_PAD_RIGHT).$echo_key."\n";
}