single page web crawl in PHP

Question

I am new to PHP. Can someone help me figure out how to crawl single html page and print all the words in the source code of that page?

Answer 1

$words = explode(" ", strip_tags(file_get_contents("www.example.com"));
function trim_and_print(&$value) 
{ 
    trim($value);
    if(strlen($value > 3) 
        echo $value;
}

array_walk($words, 'trim_and_print');

this should print words with length > 3. Thanks to moteutsch for file_get_contents