rewinddir

Example 248. Loop through a directory until a set amount of time passes or the directory changes

<?php
$time_to_wait = 12;
// For PHP3, use: $directory = '.';
$directory = getcwd ();

$directory_stream = opendir ($directory);

// Loop through the current entries in the directory
while ($entry = readdir ($directory_stream)) {
    // Make an array that stores the filenames as keys and the file sizes as values
    $file[$entry] = filesize ($entry);
}

rewinddir ($directory_stream);

print "Please wait $time_to_wait seconds until I am done with this example.<br>
    Do not modify the contents of $directory unless
    you want to see this script generate petty warnings.<br>";

for ($x=0; $x < $time_to_wait; ++$x) {
   // Display progress
   print "<br />\n" . round (($x/$time_to_wait) * 100) . "% done...";

   // Make sure nothing has changed; complain loudly and die if it has
   while ($entry = readdir ($directory_stream)) {
      if (filesize($entry) != $file[$entry]) {
         die ("<br />Why did you have to go and change $entry? I was " . round (($x/$time_to_wait) * 100) . "% done...");
       }
   }
   rewinddir ($directory_stream);

   // Sleep for one second.
   sleep (1);

   // Cause output to be displayed immediately, instead of being buffered.
   flush ();
}

print "<br />Thanks for waiting. You made this little script so happy!";
?>