php version guide

Deprecated And Removed Features

Deprecations are advance warnings. Treat them as maintenance work while the current runtime still runs the application, because removals turn delayed cleanup into upgrade blockers.

Use This Reference When

Collect E_DEPRECATED notices in development and CI.
Read each intervening migration guide before upgrading.
Fix application code and assess third-party dependencies separately.

Common Audit Examples

| Audit item | Why it matters |
| --- | --- |
| Curly-brace string and array offsets | Deprecated in 7.4, removed in 8.0 |
| Dynamic properties on most classes | Deprecated in 8.2 |
| Runtime-specific extension behaviour | May change across upgrades |
| Third-party dependency constraints | Can block the target runtime |

Do not suppress deprecations globally as a substitute for fixing them. Keep production display settings separate from logging and CI visibility.

Practice

Build a Deprecation Audit

List the search, runtime, and dependency checks you would run before a PHP upgrade.

Show solution

Search known removed syntax, run tests with deprecation reporting, inspect application logs, run Composer compatibility checks, and read each migration guide in sequence.