Below you will find historical support information for both osTicket and the version(s) of PHP that those osTicket versions supported. This is maintained for reference and is not an “official” list. This list will change once the forthcoming v2.0 is released.
1.18: support active
1.17: support active
1.16: support ended Jun 12, 2023
1.15: support ended Sep 30, 2022
1.14: support ended Feb 8, 2022
1.12: support ended Nov 17, 2020
1.11: support ended Apr 24, 2019
1.10: support ended Nov 19, 2019
1.9: support ended Feb 06, 2019
1.8: support ended Nov 1, 2016
1.18.2: supports PHP 8.2 -8.4, 8.4 recommended
1.18: supports PHP 8.0, 8.1 recommended
1.17.6: supports PHP 8.2-8.4, 8.2 recommended
1.17: supports PHP 8.0, 8.1 recommended
1.16: supports PHP 7.2 – 7.4
1.15: supports PHP 7.2 – 7.4
1.14: supports PHP 5.6 – 7.3, 7.4 unofficially
1.12: supports PHP 5.6 – 7.2
If you find something inaccurate about this list please let me know.