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<?php var_dump((new DateTime('@123'))->format('U') === '123'); var_dump((new DateTimeImmutable('@123'))->format('U') === '123'); var_dump((new DateTime('@123.456789'))->format('U.u') === '123.456789'); var_dump((new DateTimeImmutable('@123.456789'))->format('U.u') === '123.456789');
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 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, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
bool(true) bool(true) bool(true) bool(true)
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 7.0.0 - 7.0.33
bool(true) bool(true) Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (@123.456789) at position 9 (8): Unexpected character in /in/tG4fN:6 Stack trace: #0 /in/tG4fN(6): DateTime->__construct('@123.456789') #1 {main} thrown in /in/tG4fN on line 6
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
bool(true) bool(true) Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (@123.456789) at position 9 (8): Unexpected character' in /in/tG4fN:6 Stack trace: #0 /in/tG4fN(6): DateTime->__construct('@123.456789') #1 {main} thrown in /in/tG4fN on line 6
Process exited with code 255.
Output for 5.4.0 - 5.4.45
bool(true) Fatal error: Class 'DateTimeImmutable' not found in /in/tG4fN on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/tG4fN on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/tG4fN on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/tG4fN on line 3
Process exited with code 255.

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