Babby's first program

<?php

parse_str($argv[1]); #get thread, format 'C:\php\php.exe -f 4chan.php -- thread=xxxxxxxx'

while($chan = file_get_contents("http://boards.4chan.org/b/thread/".$thread)){ # while not 404'ed
    if(!preg_match_all("/(i\\.4cdn\\.org\\/b\\/[\\d]+\\.[a-z][a-z][a-z][a-z]?)/i", $chan, $linkarray)) { #check for any image links, if while check failed it provides secondary death
        die("Failed or 404");
    }

    $dedup = array_unique($linkarray[1]); #there are two links to each file

    foreach($dedup as $value) {
        preg_match("/i\\.4cdn\\.org\\/b\\/([\\d]+\\.[a-z][a-z][a-z][a-z]?)/i", $value, $valarray); #Capture 'filename.extention'
        if(file_exists("/b/img/".$valarray[1])) { #if file exists
            continue;
        }else{ #if file does not exist
            file_put_contents("/b/img/".$valarray[1], file_get_contents("http://".$value)); #put file
            echo($valarray[1].": Done.\n");
        }
    }

    echo("Looping in 5s to check again.\n");

    sleep(5); #wait a bit
}
echo("Done.\n");
?>