Downloading images through the use of code

I have a question for a friend of mine (yes, it's actually for a friend of mine). Here is my code below. First of all, am I correct in assuming I could download a file and parse it using fopen("url")? Secondly, if I find an IMG tag, how would I go about grabbing the file that is contained in the SRC of that image tag? Would another simple fopen() and fput() to another file work with that, or is there an easier way? $file = fopen("http://url"); while(!feof($file)) { $newline = fgets($file); if(str_replace("IMG SRC", "", $newline) != $newline) { /*do stuff*/ } } Thanks a lot everyone! Liam...