Description:
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From manual page: http://www.php.net/function.svn-update#Rückgabewerte
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The return value of the svn_update function is incorrect. It should be the current revision but it seems to me, that the return value is always 1.

Test script:
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print svn_update($path, SVN_REVISION_HEAD, true);

Expected result:
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The current revison number

Actual result:
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1