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<?php $a = new DateInterval("P0Y0DT17H45M0S"); $b = new DateInterval("P0Y0DT21H15M0S"); $unique = array_unique([$a, $b], SORT_REGULAR); var_dump($a == $b); var_dump($unique);
Output for 7.4.0 - 7.4.24, 8.0.0 - 8.0.11
Warning: Cannot compare DateInterval objects in /in/jfX0I on line 4 Warning: Cannot compare DateInterval objects in /in/jfX0I on line 4 Warning: Cannot compare DateInterval objects in /in/jfX0I on line 5 bool(false) array(2) { [0]=> object(DateInterval)#1 (16) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(0) ["h"]=> int(17) ["i"]=> int(45) ["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) } [1]=> object(DateInterval)#2 (16) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(0) ["h"]=> int(21) ["i"]=> int(15) ["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) } }
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.30
bool(true) array(1) { [0]=> object(DateInterval)#1 (16) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(0) ["h"]=> int(17) ["i"]=> int(45) ["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) } }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
bool(true) array(1) { [0]=> object(DateInterval)#1 (15) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(0) ["h"]=> int(17) ["i"]=> int(45) ["s"]=> int(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) } }

preferences:
134 ms | 403 KiB | 98 Q