Function names in private strings...

I hope this is the right list to post this to... I have a software project called SQL Relay with a C++ API. It has a C API which wraps the C++ API and a PHP API which wraps the C API. The PHP API has always worked for me in the past, but a few people have complained over the last few months of random, strange bugs that I could not reproduce. I originally dismissed them, then finally looked into my own code but could never find anything. At length, I randomly ran across one of the reported bugs while adding a new function to the PHP API. It appears that in some circumstances, character pointers are getting reassigned to point to PHP function names. For example: My C++ API has a private variable: char *querystring; It also has methods: void sqlrclient::prepareQuery(char *query) { ... querystring=query; ... } ... void sqlrclient::defineOutputBindVariable(char *variable, int length) { ... } ... void sqlrclient::executeQuery() { ... } Then, there is a C wrapper API for the C++ API with functions like: void sqlrc_prepareQuery(sqlrc s,char *query); void sqlrc_defineOutputBindVariable(sqlrc s,char *variable, int length); void sqlrc_executeQuery(sqlrc s); and at last, a PHP wrapper with functions named the same as the C wrapper. When I put some debug code into the C++ API and run the following PHP code: ... sqlrc_prepareQuery($s,"begin :output:=100; end;"); sqlrc_defineOutputBindVariable($s,"output",5); sqlrc_executeQuery($s) ... I find that when the C++ method prepareQuery() exits querystring=="begin :output:=100; end;" but at the start of defineOutputBindVariable(), querystring=="sqlr_defineoutputbindvariable" The private variable querystring now points to the name of that function. It happens every time, and if I leave out the call to sqlrc_defineOutputBindVariable(), queryclient stays set to the query. If I place calls to other functions between those functions, querystring still gets set to "sqlr_defineoutputbindvariable". Like there's magic associated with that function. Other people have reported the same bug to me, but with different functions and different private variables. In some cases, a variable in the C++ API's base class gets reset. I've been over all of my code with a fine-toothed comb and can't find anything that could cause something like that to happen. My Perl and Python wrappers work just fine. I suspect a bug in PHP (or some component of it) though there may be some too-obvious-to-notice bug in my PHP wrapper code. At any rate, is this a known issue? Is there some glaring error that I've made? Is there anything I can do to debug it further on my end? Thanks, David Muse david.muse@zapmedia.com