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Recursively diffs two paths (PECL svn:0.1-0.2)
array svn_diff ( string path1, int rev1, string path2, int rev2 )

Recursively diffs two paths, path1 and path2.


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



First path to diff. This can be a URL to a file/directory in an SVN repository or a local file/directory path.


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() or dirname(__FILE__).


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.


First path's revision number. Use SVN_REVISON_HEAD to specify the most recent revision.


Second path to diff. See path1 for description.


Second path's revision number. See rev2 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(). 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.



This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.


Example 2494. Basic example

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

list($diff, $errors) = svn_diff(
if (!
$diff) exit;
$contents = '';
while (!
feof($diff)) {
$contents .= fread($diff, 8192);

The above example will output:

---        (.../foo) (revision 23)
+++ (.../foo) (revision 27)
// further diff output

Example 2495. 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):

function svn_diff_same_item($path, $rev1, $rev2) {
svn_diff($path, $rev1, $path, $rev2);

Example 2496. Portably diffing two local files

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

function svn_diff_local($path1, $rev1, $path2, $rev2) {
$path1 = str_replace('\\', '/', realpath($path1));
$path2 = str_replace('\\', '/', realpath($path2));
svn_diff($path1, $rev1, $path2, $rev2);