_convert_to_string  502 Zend/zend_operators.c 		_convert_to_string(op ZEND_FILE_LINE_CC);
_convert_to_string  243 Zend/zend_operators.h ZEND_API void ZEND_FASTCALL _convert_to_string(zval *op ZEND_FILE_LINE_DC);
_convert_to_string  274 Zend/zend_operators.h #define convert_to_string(op) if (Z_TYPE_P(op) != IS_STRING) { _convert_to_string((op) ZEND_FILE_LINE_CC); }