Stopwords removal

script.php

<?php
 
if (count($argv) != 4) {
	echo("Usage: text file, stop words file, output file.\n");
	exit;
}
 
if (!file_exists($argv[1])) {
	exit("Unable to open file $argv[1]!\n");
}
 
if (!file_exists($argv[2])) {
	exit("Unable to open file $argv[2]!\n");
}
 
$post = file_get_contents($argv[1]);
$stop_words = file($argv[2]);
 
foreach ($stop_words as $word) {
	$word = rtrim($word);
	$post = preg_replace("/\b$word\b/i", "", $post);
}
 
$post = preg_replace("/\d/", "", $post);
$post = preg_replace("/[?;:!,.'\"]/", "", $post);
 
$output = fopen($argv[3], 'w') or
	exit("Unable to open file $argv[3]\n!");
fwrite($output, $post);
fclose($output);
?>