_convert_to_cstring  328 Zend/zend_operators.h ZEND_API void _convert_to_cstring(zval *op ZEND_FILE_LINE_DC);
_convert_to_cstring  342 Zend/zend_operators.h #define convert_to_cstring(op) if ((op)->type != IS_STRING) { _convert_to_cstring((op) ZEND_FILE_LINE_CC); }