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Developer tools · #composer
Stop unpredictable production crashes by mastering the difference between composer.json and composer.lock. Learn how to use the SAT solver and SemVer to ensure environment parity.
Learn how to eliminate environment drift in PHP by separating dependency resolution from installation using Composer's SAT solver and lock files.
Stop fighting 'Class not found' errors. Learn when to use PSR-4 for dynamic development and when to leverage Classmaps for production performance in PHP.
Commit composer.lock for apps and run composer install in CI. Update locally to move constraints, install everywhere else to reproduce the exact dependency graph with Composer 2.
Learn how to use caret (^) and tilde (~) operators in Composer to manage PHP dependencies, balancing the need for security updates with application stability.
When your team’s PHP versions drift, dependency resolution can break. Composer’s `config.platform` lets you emulate a specific PHP runtime during installs, ensuring the same lockfile everywhere. Learn how to set it up, what it does, and its trade‑offs.
Platform Requirement Parity Composer utilizes the composer.lock file to ensure environment parity by prioritizing locked versions over composer.json constraints during the install command. To prevent runtime failures, Composer validates that the local PHP version and installed extensions meet the requirements defined by the dependency graph. Conflict Resolut
Goal In continuous‑integration pipelines I want Composer to omit dev‑only packages automatically, so the vendor tree stays small and the install step is fast. Constraints The repository must stay usable for local developers who still need dev tools, and any CI tests that rely on dev packages must either be moved to the main dependency set or installed separa
A team wants reproducible dependency sets for applications while avoiding repeated security advisory notifications in CI. Composer documents install as reproducing the exact versions recorded in composer.lock and update as re-resolving version constraints against repositories and writing a new lock file. The distinction creates an unresolved decision about w
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