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<?php $diff = DateInterval::createFromDateString('1 year and 2 months'); print('<hr><pre>');var_dump($diff);print('</pre>');
Output for 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Fatal error: Uncaught DateMalformedIntervalStringException: Unknown or bad format (1 year and 2 months) at position 7 (a): The timezone could not be found in the database in /in/YgaPE:3 Stack trace: #0 /in/YgaPE(3): DateInterval::createFromDateString('1 year and 2 mo...') #1 {main} thrown in /in/YgaPE on line 3
Process exited with code 255.
Output for 7.2.17 - 7.2.34, 7.3.4 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29
Warning: DateInterval::createFromDateString(): Unknown or bad format (1 year and 2 months) at position 7 (a): The timezone could not be found in the database in /in/YgaPE on line 3 <hr><pre>bool(false) </pre>
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.16, 7.3.0 - 7.3.3
<hr><pre>object(DateInterval)#1 (16) { ["y"]=> int(1) ["m"]=> int(2) ["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) } </pre>

preferences:
104.2 ms | 410 KiB | 5 Q