Question
What are the PHP requirements for WHMCS?
Answer
The requirements for WHMCS V 8.0 and above will be in the chart below. There's also links on the WHMCS website for older versions of WHMCS.
| Requirement | Minimum | Recommended |
|---|---|---|
| PHP Version | 7.2 | Latest 7.3 or 7.4 Release |
| PHP Memory Limit | 64MB | 128MB** |
| PHP Database Extension | PDO | PDO |
| PHP Extensions | Curl with SSL GD2 Image Library |
Iconv MBString |
| MySQL Version | 5.2.0 | Latest 5.7 |
| Ioncube Loaders | 10.2.0 or later | The latest 10.x Ioncube for your PHP version |
https://docs.whmcs.com/System_Requirements
https://docs.whmcs.com/PHP_Version_Support_Matrix