PHP error guide

Composer platform requirements not satisfied: meaning and fix

error other Affects: Composer 2.x Last verified:

Error summary

Run Composer with the deployment PHP version or select package versions supporting that runtime. The active PHP interpreter does not satisfy a package platform constraint.

What it means

Run Composer with the deployment PHP version or select package versions supporting that runtime. The active PHP interpreter does not satisfy a package platform constraint.

What the error means

This message means that the active PHP interpreter does not satisfy a package platform constraint. The exact signature distinguishes composer platform requirements not satisfied from a generic application failure.

Why PHP produces it

The engine or service reports “Composer platform requirements not satisfied” because its required precondition was not met. Run Composer with the deployment PHP version or select package versions supporting that runtime.

PHP version notes

The composer platform requirements not satisfied wording here is based on Composer 2.x; punctuation and exception class names can differ on older branches or vendor builds.

Most common causes

  • The immediate input or configuration reaches the specific condition: the active PHP interpreter does not satisfy a package platform constraint
  • The code path assumes the prerequisite for composer platform requirements not satisfied has already been satisfied.
  • For composer platform requirements not satisfied, development and production differ in version, extension, permissions, paths, or service configuration.
  • An earlier operation returned an unchecked value that is consumed by the line reporting composer platform requirements not satisfied.

Minimal examples

BAD — reproduces the problem

shell 
composer install --ignore-platform-req=php

FIXED — safer pattern

shell 
php -v
composer check-platform-reqs

Step-by-step diagnosis

  1. Copy the complete “Your Composer dependencies require a PHP version ">= 8.2.0". You are running 8.1.29.” text and retain the first application stack frame.
  2. Reproduce composer platform requirements not satisfied in the same SAPI and environment listed for this page.
  3. Before changing composer platform requirements not satisfied, inspect the preceding value or directive and verify its type, path, version, and permissions.
  4. Apply the narrow correction—run Composer with the deployment PHP version or select package versions supporting that runtime—then repeat the original request once.

Fixes

Correct the failing prerequisite

Run Composer with the deployment PHP version or select package versions supporting that runtime

shell 
php -v
composer check-platform-reqs

Fail explicitly at the boundary

Validate the condition before the operation that emits composer platform requirements not satisfied, and log a safe diagnostic without credentials or full production paths.

Common mistakes when fixing it

  • Suppressing composer platform requirements not satisfied instead of correcting its upstream condition.
  • Testing composer platform requirements not satisfied only with the CLI binary when the failing request runs under FPM or Apache.
  • Changing a global setting for composer platform requirements not satisfied before confirming the site-specific effective configuration.

How to prevent it

  • Add a focused test that exercises the boundary responsible for composer platform requirements not satisfied.
  • Keep runtime versions, extensions, configuration, and deploy artifacts affecting composer platform requirements not satisfied reproducible.
  • Validate external data and service return values before they can trigger composer platform requirements not satisfied.

Web server / environment notes

cli, composer, linux, docker. The failure occurs where the active PHP interpreter does not satisfy a package platform constraint

Tags: cli,composer,linux,docker

Categories

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