To checkout a single file at a particular version use svn_cat .
(PECL svn >= 0.3.0)
svn_export — Export the contents of a SVN directory
$frompath
, string $topath
[, bool $working_copy = TRUE
[, int $revision_no = -1
]] ) : boolExport the contents of either a working copy or repository into a 'clean' directory.
frompathThe path to the current repository.
topathThe path to the new repository.
working_copy
If TRUE, it will export uncommitted files from the working copy.
成功时返回 TRUE， 或者在失败时返回 FALSE。
Example #1 svn_export() example
<?php
$working_dir = '../';
$new_working_dir = '/home/user/devel/foo/trunk';
svn_export($working_dir, $new_working_dir);
?>
To checkout a single file at a particular version use svn_cat .
This functionality is very different from the actual command line svn export url [-rRevision]
If you are thinking about checkout out a single file at a particular version, keep looking because this export can not perform that functionality.