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<?php $a = new DateTime('2020-01-01 23:59:40'); $b = new DateTimeImmutable('2020-01-01 23:59:40'); var_dump($a, $b); $a->add(new DateInterval('P1D')); $c = $b->add(new DateInterval('P1D')); DateTimeImmutable::fromMutable($a); var_dump($a, $b, $c);
Output for 7.3.0 - 7.3.31, 7.3.33, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
object(DateTime)#1 (3) { ["date"]=> string(26) "2020-01-01 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2020-01-01 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } Fatal error: Uncaught Error: Call to undefined method DateTimeImmutable::fromMutable() in /in/pCRTB:11 Stack trace: #0 {main} thrown in /in/pCRTB on line 11
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 object(DateTime)#1 (3) { ["date"]=> string(26) "2020-01-01 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2020-01-01 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } Fatal error: Uncaught Error: Call to undefined method DateTimeImmutable::fromMutable() in /in/pCRTB:11 Stack trace: #0 {main} thrown in /in/pCRTB on line 11
Process exited with code 255.
Output for 7.3.32, 7.4.26, 8.0.13
object(DateTime)#1 (3) { ["date"]=> string(26) "2020-01-01 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2020-01-01 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } Fatal error: Uncaught Error: Call to undefined method DateTimeImmutable::fromMutable() in /in/pCRTB:11 Stack trace: #0 {main} thrown in /in/pCRTB on line 11
Process exited with code 255.

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