date_interval_read_property  636 ext/date/php_date.c zval *date_interval_read_property(zval *object, zval *member, int type, const zend_literal *key TSRMLS_DC);
date_interval_read_property 2077 ext/date/php_date.c 	date_object_handlers_interval.read_property = date_interval_read_property;