php man page for svn_diff

SVN_DIFF(3)								 1							       SVN_DIFF(3)

svn_diff - Recursively diffs two paths

SYNOPSIS
       array svn_diff (string  $path1, int  $rev1, string  $path2, int	$rev2)

DESCRIPTION
	Recursively diffs two paths, $path1 and $path2.

       Note

	       This is not a general-purpose diff utility. Only local files that are versioned may be diffed: other files will fail.

PARAMETERS
	      o $path1
		- First path to diff. This can be a URL to a file/directory in an SVN repository or a local file/directory path.

	      Note

		     Relative  paths  will  be	resolved  as if the current working directory was the one that contains the PHP binary. To use the
		     calling script's working directory, use realpath(3) or dirname(__FILE__).

	      Warning

		      If a local file path has only backslashes and no forward slashes, this extension will fail to find the path. Always  replace
		     all backslashes with forward slashes when using this function.

	      o $rev1
		- First path's revision number. Use SVN_REVISION_HEAD to specify the most recent revision.

	      o $path2
		- Second path to diff. See $path1 for description.

	      o $rev2
		- Second path's revision number. See $rev1 for description.

RETURN VALUES
	Returns an array-list consisting of two streams: the first is the diff output and the second contains error stream output. The streams can
       be read using fread(3). Returns FALSE or NULL on error.

	The diff output will, by default, be in the form of Subversion's custom unified diff format, but an  external  diff  engine  may  be  used
       depending on Subversion's configuration.

NOTES
       Warning

	      This  function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in
	      a future release of PHP. This function should be used at your own risk.

EXAMPLES
       Example #1

	      Basic example

	       This example demonstrates the basic usage of this function, and the retrieval of contents from the stream:

	      <?php
	      list($diff, $errors) = svn_diff(
		  'http://www.example.com/svnroot/trunk/foo', SVN_REVISION_HEAD,
		  'http://www.example.com/svnroot/branches/dev/foo', SVN_REVISION_HEAD
	      );
	      if (!$diff) exit;
	      $contents = '';
	      while (!feof($diff)) {
		$contents .= fread($diff, 8192);
	      }
	      fclose($diff);
	      fclose($errors);
	      var_dump($contents);
	      ?>

	      The above example will output:

	      Index: http://www.example.com/svnroot/trunk/foo
	      ===================================================================
	      --- http://www.example.com/svnroot/trunk/foo	  (.../foo) (revision 23)
	      +++ http://www.example.com/svnroot/branches/dev/foo (.../foo) (revision 27)
	       // further diff output

       Example #2

	      Diffing two revisions of a repository path

	       This example implements a wrapper function that allows a user to easily diff two revisions of  the  same  item  using  an  external
	      repository path (the default syntax is somewhat verbose):

	      <?php
	      function svn_diff_same_item($path, $rev1, $rev2) {
		  return svn_diff($path, $rev1, $path, $rev2);
	      }
	      ?>

       Example #3

	      Portably diffing two local files

	       This  example implements a wrapper function that portably diffs two local files, compensating for the realpath(3) fix and the back-
	      slashes bug:

	      <?php
	      function svn_diff_local($path1, $rev1, $path2, $rev2) {
		  $path1 = str_replace('\', '/', realpath($path1));
		  $path2 = str_replace('\', '/', realpath($path2));
		  return svn_diff($path1, $rev1, $path2, $rev2);
	      }
	      ?>

SEE ALSO
       SVN documentation on svn diff.

PHP Documentation Group 													       SVN_DIFF(3)