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<?php var_dump(\DateInterval::createFromDateString('6 years 4 months'));
based on sQjh2
Output for 7.1.25 - 7.4.0
object(DateInterval)#1 (16) { ["y"]=> int(6) ["m"]=> int(4) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> bool(false) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) }