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<?php $monthToInt = -1; printf("Month to int:\n\tType: %s; Value: %d\nDate string: %s.\n", gettype($monthToInt), $monthToInt, date('F Y-m-d H:i:s', $monthToInt));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 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 - 8.3.6
Month to int: Type: integer; Value: -1 Date string: January 1970-01-01 00:59:59.
Output for 7.3.32 - 7.3.33, 7.4.26, 8.0.13
Month to int: Type: integer; Value: -1 Date string: December 1969-12-31 23:59:59.

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283.93 ms | 402 KiB | 354 Q