theme failure
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Theme failures after PHP updates usually stem from deprecated or removed functions.
Older code often assumes behavior that no longer exists in newer PHP versions. Error logs will usually point to the exact function causing the failure. Updating syntax and replacing deprecated calls resolves most issues.
Strict typing and warnings introduced in newer PHP versions can also expose hidden bugs. The key mistake is postponing PHP compatibility testing.
The takeaway is to keep themes aligned with supported PHP versions.