Live code coverage

This library should help you generate code coverage reports on a live server (it doesn't have to be a production server of course).

Install this library using:

composer require matthiasnoback/live-code-coverage

Collecting code coverage data

In your front controller (e.g. index.php), add the following:

<?php

use LiveCodeCoverage\LiveCodeCoverage;

$shutDownCodeCoverage = LiveCodeCoverage::bootstrap(
    (bool)getenv('CODE_COVERAGE_ENABLED'),
    __DIR__ . '/../var/coverage',
    __DIR__ . '/../phpunit.xml.dist'
);

// Run your web application now...

// This will save and store collected coverage data:
$shutDownCodeCoverage();

• The first argument passed to LiveCodeCoverage::bootstrap() is a boolean that will be used to determine if code coverage is enabled at all. The example shows how you can use an environment variable for that.
• The second argument is the directory where all the collected coverage data will be stored (*.cov files). If this directory doesn't exist yet, it will be created.
• The third argument is the path to a PHPUnit configuration file. Its <filter> section will be used to configure the code coverage whitelist. For example, this phpunit.xml.dist file might look something like this:

<?xml version="1.0" encoding="utf-8"?>
<phpunit>
    <filter>
        <whitelist>
            <directory suffix=".php">src</directory>
        </whitelist>
    </filter>
</phpunit>

Most configuration directives that are available in PHPUnit work for this library too. If you notice that something doesn't work, please submit an issue.

If you don't provide a PHPUnit configuration file, no filters will be applied, so you will get a coverage report for all the code in your project, including vendor and test code if applicable.

If your application is a legacy application which exit()s or die()s before execution reaches the end of your front controller, the bootstrap should be slightly different:

$shutDownCodeCoverage = LiveCodeCoverage::bootstrap(
    // ...
);
register_shutdown_function($shutDownCodeCoverage);

// Run your web application now...

Generating code coverage reports (HTML, Clover, etc.)

To merge all the coverage data and generate a report for it, install Sebastian Bergmann's phpcov tool. Run it like this (or in any other way you like):

phpcov merge --html=./coverage/html ./var/coverage

Downsides

Please note that collecting code coverage data will make your application run much slower. Just see for yourself if that's acceptable.