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detecting consecutive filenames

 
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Old 11-10-2009
detecting consecutive filenames
I have a series of filenames of the format junk_x_###.txt where x and ### are numbers. I need to detect when at least 30 consecutive files (e.g. junk_1_001.txt, junk_1_002.txt.....) are in the directory. There are sets of files with similar names that need to be grouped together and counted separately (e.g. junk_2_001.txt..., junk_3_001.txt....) and whichever cluster has more than 30 selected. I also need to allow for the consecutive filenames not beginning at 001 (e.g. junk_1_100.txt, junk_1_101.txt.....).

In essence I need to identify 30 consecutive files with identical filenames as far as junk_x_
What is the best strategy to take here? I'm trying to cluster the root of each filename, list them and then pipe to wc -l to count them but not getting the initial clustering to work well. Any suggestions for this step?
thanks
 
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LEARN ABOUT PHP

scandir

SCANDIR(3)								 1								SCANDIR(3)

scandir - List files and directories inside the specified path

SYNOPSIS

       array scandir (string  $directory, [int	$sorting_order = SCANDIR_SORT_ASCENDING], [resource  $context])

DESCRIPTION

	Returns an array of files and directories from the $directory.

PARAMETERS

	      o $directory
		- The directory that will be scanned.

	      o $sorting_order
		-  By default, the sorted order is alphabetical in ascending order. If the optional $sorting_order is set to SCANDIR_SORT_DESCEND-
		ING, then the sort order is alphabetical in descending order. If it is set to SCANDIR_SORT_NONE then the result is unsorted.

	      o $context
		- For a description of the $context parameter, refer to the streams section of the manual.

RETURN VALUES

	Returns an array of filenames on success, or FALSE on failure. If $directory is not a directory, then boolean FALSE is	returned,  and	an
       error of level E_WARNING is generated.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.4.0	|						    |
       |	|						    |
       |	| $sorting_orderconstants  were  added. Any nonzero |
       |	| value caused descending order  in  previous  ver- |
       |	| sions. So for all PHP versions, use 0 for ascend- |
       |	| ing order, and 1 for descending order. An  option |
       |	| for  SCANDIR_SORT_NONE  behavior  did  not  exist |
       |	| prior to PHP 5.4.0.				    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      A simple scandir(3) example

	      <?php
	      $dir    = '/tmp';
	      $files1 = scandir($dir);
	      $files2 = scandir($dir, 1);

	      print_r($files1);
	      print_r($files2);
	      ?>

	      The above example will output something similar to:

	      Array
	      (
		  [0] => .
		  [1] => ..
		  [2] => bar.php
		  [3] => foo.txt
		  [4] => somedir
	      )
	      Array
	      (
		  [0] => somedir
		  [1] => foo.txt
		  [2] => bar.php
		  [3] => ..
		  [4] => .
	      )

       Example #2

	      PHP 4 alternatives to scandir(3)

	      <?php
	      $dir = "/tmp";
	      $dh  = opendir($dir);
	      while (false !== ($filename = readdir($dh))) {
		  $files[] = $filename;
	      }

	      sort($files);

	      print_r($files);

	      rsort($files);

	      print_r($files);

	      ?>

	      The above example will output something similar to:

	      Array
	      (
		  [0] => .
		  [1] => ..
		  [2] => bar.php
		  [3] => foo.txt
		  [4] => somedir
	      )
	      Array
	      (
		  [0] => somedir
		  [1] => foo.txt
		  [2] => bar.php
		  [3] => ..
		  [4] => .
	      )

NOTES

       Tip

	      A URL can be used as a filename with this function if the fopen wrappers have been enabled. See fopen(3) for more details on how	to
	      specify  the filename. See the "Supported Protocols and Wrappers" for links to information about what abilities the various wrappers
	      have, notes on their usage, and information on any predefined variables they may provide.

SEE ALSO

       opendir(3), readdir(3), glob(3), is_dir(3), sort(3).

PHP Documentation Group 														SCANDIR(3)