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PHP Parallel Lint

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This application checks syntax of PHP files in parallel. It can output in plain text, colored text, json and checksyntax formats. Additionally blame can be used to show commits that introduced the breakage.

Running parallel jobs in PHP is inspired by Nette framework tests.

The application is officially supported for use with PHP 5.3 to 8.1.

Table of contents

  1. Installation
  2. Example output
  3. History
  4. Command line options
  5. Recommended excludes for Symfony framework
  6. Excluding files from a scan based on the PHP version used
  7. How to upgrade


Install with composer as development dependency:

composer require --dev php-parallel-lint/php-parallel-lint

Alternatively you can install as a standalone composer project:

composer create-project php-parallel-lint/php-parallel-lint /path/to/folder/php-parallel-lint
/path/to/folder/php-parallel-lint/parallel-lint # running tool

For colored output, install the suggested package php-parallel-lint/php-console-highlighter:

composer require --dev php-parallel-lint/php-console-highlighter

Since v1.3.0, a PHAR file is also made available for each release. This PHAR file is published as an asset for each release and can be found on the Releases page.

Example output

Example use of tool with error


This project was originally created by @JakubOnderka and released as jakub-onderka/php-parallel-lint.

Since then, Jakub has moved on to other interests and as of January 2020, the second most active maintainer @grogy has taken over maintenance of the project and given the project - and related dependencies - a new home in the PHP Parallel Lint organisation.

It is strongly recommended for existing users of the (unmaintained) jakub-onderka/php-parallel-lint package to switch their dependency to php-parallel-lint/php-parallel-lint, see How to upgrade below.

Command line options

To run from the command line:

vendor/bin/parallel-lint --exclude .git --exclude app --exclude vendor .

Excluding files from a scan based on the PHP version used

Sometimes a particular file in a project may not comply with the project-wide minimum PHP version, like a file which is conditionally included in the project and contains PHP syntax which needs a higher PHP version to run.

This can make it complicated to run Parallel Lint in a CI context, as the excludes used in the command would have to be adjusted based on the PHP version on which the scan is being run.

PHP Parallel Lint offers a straight-forward way around this, as files can define their own minimum PHP version like so:

<?php // lint >= 7.4

// Code which contains PHP 7.4 syntax.

With this comment in place, the file will be automatically skipped when PHP Parallel Lint is run on a PHP version lower than PHP 7.4.

Note: The // lint >= 7.4 comment has to be only the first line of the file and must directly follow the PHP open tag.

How to upgrade

Are you using jakub-onderka/php-parallel-lint package? You can switch to php-parallel-lint/php-parallel-lint using:

composer remove --dev jakub-onderka/php-parallel-lint
composer require --dev php-parallel-lint/php-parallel-lint