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PHP 8.5 introduces features like the pipe operator for cleaner function chaining, a built-in URI extension for robust URL parsing, and the #[NoDiscard] attribute to prevent ignored return values. Key deprecations include backticks for shell commands and non-canonical cast names. The upgrade process should follow a staged approach: test locally, enable deprecation warnings in CI, deploy to staging, then production. New conveniences include array_first() and array_last() functions, improved clone() syntax for immutable objects, and persistent cURL share handles for performance optimization.

How to Upgrade to PHP 8.5 Without Breaking Your Codebase

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