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run code in 200+ php & hhvm versions
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<?php $x = new DateTimeImmutable('2015-07-31'); $y = $x->modify('30 day of -1 month'); var_dump($y); var_dump($y->setDate($y->format('Y'), $y->format('n'), 30)); var_dump($y->setDate((int) $y->format('Y'), (int) $y->format('n'), 30));
based on ddPCo
Output for 7.0.0 - 7.2.0
Warning: DateTimeImmutable::modify(): Failed to parse time string (30 day of -1 month) at position 7 (o): The timezone could not be found in the database in /in/9AbEI on line 5 bool(false) Fatal error: Uncaught Error: Call to a member function setDate() on boolean in /in/9AbEI:7 Stack trace: #0 {main} thrown in /in/9AbEI on line 7
Process exited with code 255.
Output for 5.6.7 - 5.6.28
Warning: DateTimeImmutable::modify(): Failed to parse time string (30 day of -1 month) at position 7 (o): The timezone could not be found in the database in /in/9AbEI on line 5 bool(false) Fatal error: Call to a member function setDate() on boolean in /in/9AbEI on line 7
Process exited with code 255.
Output for 5.5.24 - 5.5.35
Warning: DateTimeImmutable::modify(): Failed to parse time string (30 day of -1 month) at position 7 (o): The timezone could not be found in the database in /in/9AbEI on line 5 bool(false) Fatal error: Call to a member function setDate() on a non-object in /in/9AbEI on line 7
Process exited with code 255.
Output for 5.3.18 - 5.4.45
Fatal error: Class 'DateTimeImmutable' not found in /in/9AbEI on line 3
Process exited with code 255.