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<?php echo (new DateTimeImmutable())->modify('+ first monday')->format('Y-m-d H:i:s');
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught DateMalformedStringException: DateTimeImmutable::modify(): Failed to parse time string (+ first monday) at position 0 (+): Unexpected character in /in/iS41V:3 Stack trace: #0 /in/iS41V(3): DateTimeImmutable->modify('+ first monday') #1 {main} thrown in /in/iS41V on line 3
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Warning: DateTimeImmutable::modify(): Failed to parse time string (+ first monday) at position 0 (+): Unexpected character in /in/iS41V on line 3 Fatal error: Uncaught Error: Call to a member function format() on bool in /in/iS41V:3 Stack trace: #0 {main} thrown in /in/iS41V on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33
Warning: DateTimeImmutable::modify(): Failed to parse time string (+ first monday) at position 0 (+): Unexpected character in /in/iS41V on line 3 Fatal error: Uncaught Error: Call to a member function format() on boolean in /in/iS41V:3 Stack trace: #0 {main} thrown in /in/iS41V on line 3
Process exited with code 255.
Output for 5.6.8 - 5.6.28
Warning: DateTimeImmutable::modify(): Failed to parse time string (+ first monday) at position 0 (+): Unexpected character in /in/iS41V on line 3 Fatal error: Call to a member function format() on boolean in /in/iS41V on line 3
Process exited with code 255.
Output for 5.5.24 - 5.5.35
Warning: DateTimeImmutable::modify(): Failed to parse time string (+ first monday) at position 0 (+): Unexpected character in /in/iS41V on line 3 Fatal error: Call to a member function format() on a non-object in /in/iS41V on line 3
Process exited with code 255.
Output for 5.4.2 - 5.4.45
Fatal error: Class 'DateTimeImmutable' not found in /in/iS41V on line 3
Process exited with code 255.

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