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finding file in directory

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I have a service that is ftp-pushing one file per day into my site and I need to write some PHP to set the filename as a variable.

Here's the structure of a file's name--


The first part 'rva-1' will always be that. The second part '20060313' is obviously the current date and I can easily calculate that. The last part 'zip' will also always be that.

The problem is the '1107'. That is a time stamp and will likely always be different.

I suppose I need to create an array by searching the directory with something like
$array = scandir(/tmp);

That could be completely the wrong way to start, can someone give me a hand on how to find out first if that file is in there yet, and if so, to set a var of $fileName with the file's name...

Thanks in advance!

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To check if the file is actually in the directory I would try something like this, which is the best I can think of right now - anyone else have any better ideas?
// Set some vars
$dir = "/public/uploads/";
$found = 0;
$date = date("Ymd");

// Open a known directory, and proceed to read its contents and check for the presence of a partial filename
if(is_dir($dir)) {
   if($dh = opendir($dir)) {
       while((($file = readdir($dh)) !== false) && $found == 0) {
           if(strpos($file,"rva-1.$date.")) {
              $found = 1;
              $filename = $file;

if(isset($filename)) echo "Todays file was found, it is called <b>$filename</b>";

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