PHP 8 Migration Checklist

PHP 8 migration projects fail when teams skip dependency and compatibility planning. This checklist keeps upgrades predictable.

Migration checklist

• Inventory all runtime dependencies and unsupported libraries.
• Review framework compatibility (Laravel/Symfony version constraints).
• Identify deprecated language features and risky custom extensions.
• Create a staged upgrade path with test gates.
• Run production-like performance and regression checks.
• Plan rollback-safe deployment steps.

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