Description:
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Support for some/all of the switches that the usual SVN executable supports would be highly appreciated. A concrete example of where this would be useful is the svn_log() function: currently it's an all-or-nothing proposition, returning every log message in all the history of the item, or returning a single log message from a single revision. The ability to use the --limit NUM switch is not only helpful: it's necessary! Otherwise, the function is extremely inefficient and, for items with revisions in the thousands, useless.

See http://svnbook.red-bean.com/en/1.2/svn.ref.html#svn.ref.svn.sw for documentation on the switches. Not all switches are supported by all functions.

Because each action supports so many switches, I think that passing them in as an array would be most suitable. More information is detailed below.

This probably requires a lot of effort, judging from the current source code, it doesn't look like the SVN libraries natively support these switches. You may want to prioritize based on the "must have" switches versus the "ah, they can wait" switches. I can provide a list, if you want, of what I consider to be "must have" switches, but you should probably use your judgment, as you'd be the one writing the code (sorry, for me, C is read-only).

Reproduce code:
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Here's a possible use-case:

$logs = svn_log(
  'http://www.example.com/svnroot',
  -2, // we want all revisions...
  array(
    'limit' => 10, // ...but only the first ten...
    'stop-on-copy' => true // ...and don't go too deep!
  )
);