php - How to understand the 3 lines of c code? -

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 if (zend_parse_parameters(zend_num_args() tsrmls_cc, "|l", &flag) == failure) {   return;  }

especially what's zend_num_args() tsrmls_cc doing?

it looks tsrmls_cc macro might expand nothing or might expand argument comma thrown in there:

http://blog.golemon.com/2006/06/what-heck-is-tsrmlscc-anyway.html


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