Help: Calling userland functions from within an extension

Hi all, I've just finished a PHP extension and now I need to know how to call a userland PHP function from it. I need to use Headers() to be able to download a file that is generated by my extension. So far I've used this function from the php-script that uses my extension, but I'd like to embed this functionallity into it. I've searched the php-sources to see the implementation of headers(), but the function that seems to do the job (at SAPI.h): SAPI_API int sapi_header_op( sapi_header_op_enum op, void *arg TSRMLS_DC); ...fails at link time complaining about an undefined symbol related to sapi_header_op_enum (which is also declared in that header). Do I need a SAPI *.so or *.a module? I apologyze if this is not the right place to ask this, if it isn't, please point me to the correct one. Thanks in advance. __________________________________ Do you Yahoo!? Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes http://hotjobs.sweepstakes.yahoo.com/signingbonus