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<?php $distance = -10; $dt = new DateTimeImmutable('2024-03-21 12:00:00'); var_dump($dt->modify("-{$distance} hours")); var_dump($dt->modify((-$distance) . " hours"));
Output for 8.1.27 - 8.1.33, 8.2.25 - 8.2.29, 8.3.13 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1
object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2024-03-21 22:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2024-03-21 22:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.2.16 - 8.2.24, 8.3.3 - 8.3.12
object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2024-03-21 02:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2024-03-21 22:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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