PHP Version Support Matrix
From WHMCS Documentation
WHMCS Version (Status) | PHP v5.2 | PHP v5.3 | PHP v5.4 | PHP v5.6 | PHP v7.0 | PHP v7.1 | PHP v7.2 |
---|---|---|---|---|---|---|---|
v6.3 (EOL) | Y | Y | Y | Y | N | N | N |
v7.0 (EOL) | N | N | N | Y | Y | N | N |
v7.1 (LTS) | N | N | N | Y | Y | N | N |
v7.2 (LTS) | N | N | N | Y | Y | N | N |
v7.3 (LTS) | N | N | N | Y | Y | N | N |
v7.4 (Active) | N | N | N | Y | Y | N | N |
v7.5 (Beta) | N | N | N | Y | Y | Y | Y |