Code Checker is a command-line tool that scans your source code for common formal errors – and can fix many of them automatically. It works with PHP, Latte, NEON, JSON and YAML files, checking encoding, line endings, indentation, trailing whitespace and more.

It runs as a standalone application, not as a project dependency.

Documentation can be found on the website. If you like it, please make a donation now. Thank you!

Install it globally via Composer:

composer global require nette/code-checker

Make sure your global Composer bin directory is in your PATH. The code-checker command is then available from anywhere, on any operating system.

Alternatively, install it as a standalone project:

composer create-project nette/code-checker

It requires PHP 8.0 or higher.

By default, Code Checker runs in read-only mode and only reports the problems it finds:

code-checker

To actually repair the files, add --fix. Back up your files first, or run it on a clean working tree so you can review the changes afterwards with git diff:

code-checker --fix

You can limit the scan to a specific path, skip files, or run faster syntax-only checks:

code-checker -d src --ignore "temp/*"
code-checker --only-syntax

In read-only mode the tool exits with code 0 when everything is fine and 1 when any problem is found, so it fits nicely into CI pipelines.

Full list of options:

Usage: code-checker [options]

Options:
    -d <path>             Folder or file to scan (default: current directory)
    -i | --ignore <mask>  Files to ignore
    -f | --fix            Fix the files
    -l | --eol            Normalize line endings to the system default
    --only-syntax         Check syntax only (faster)
    --no-progress         Do not show progress dots
    --version             Show version

• checks the syntax of PHP, Latte, NEON and JSON files
• removes the BOM
• verifies that files are valid UTF-8
• checks for control characters
• detects malformed phpDoc comments around annotations (e.g. /* @var instead of /** @var)
• checks that PHP files declare strict_types=1
• enforces tabs for indentation in PHP, CSS, JS and TS files, and spaces in YAML
• removes trailing whitespace and blank lines at the end of files
• normalizes line endings to the system default (with the -l parameter)