Setting Up PHP CS Fixer

PHP CS Fixer applies repeatable code-format rules based on configured fixers.

What It Does

PHP CS Fixer applies repeatable code-format rules based on configured fixers. The following examples distinguish a normal use case, a boundary case and a practical application.

Requirements and Compatibility

PHP 8.x and a local test environment. Apply input validation, correct error handling and the requirements of any optional libraries.

The code focuses on the core concept. Production implementation may also need routes, validation, persistence, authorization or deployment tooling.

Example 1: Basic Behavior

Install the formatter as a development dependency.

composer require --dev friendsofphp/php-cs-fixer

This is a command-line example; use it in its appropriate file or shell, not in the PHP source editor.

Example 2: Another Case

Run a non-mutating formatting check in CI.

vendor/bin/php-cs-fixer fix --dry-run --diff

This is a command-line example; use it in its appropriate file or shell, not in the PHP source editor.

Practical Example: Putting It to Use

A readable sample function using consistent spacing and type declarations.

<?php
function formatOrder(int $quantity, int $price): int
{
    return $quantity * $price;
}
echo formatOrder(2, 125);

Important Behavior and Edge Cases

A successful formatter run does not mean behavior, security or performance is correct.

Comparison with Related Functions or Approaches

Common Beginner Mistakes

Key Takeaways

• PHP CS Fixer applies repeatable code-format rules based on configured fixers.
• A successful formatter run does not mean behavior, security or performance is correct.
• Use a dry-run check in CI and apply fixes during development.

Before adapting these examples, verify the return values, test the failure paths and confirm that your application meets its security and environment requirements.