xstr             3331 ext/odbc/php_odbc.c #define EMPTY_TO_NULL(xstr) \
xstr             3332 ext/odbc/php_odbc.c 	if ((int)strlen((xstr)) == 0) (xstr) = NULL
xstr              258 main/php_streams.h #define php_stream_from_zval(xstr, ppzval)	ZEND_FETCH_RESOURCE2((xstr), php_stream *, (ppzval), -1, "stream", php_file_le_stream(), php_file_le_pstream())
xstr              259 main/php_streams.h #define php_stream_from_zval_no_verify(xstr, ppzval)	(xstr) = (php_stream*)zend_fetch_resource((ppzval) TSRMLS_CC, -1, "stream", NULL, 2, php_file_le_stream(), php_file_le_pstream())