PHPUnit Code Coverage Report of Web App

index.php

<?php
/**
  How to run a code coverage report on a web page: 
  Simply put this code after the vendor require and before the rest of the calling logic.

  (Assumes you have PHPUnit installed)
**/

require_once __DIR__ . "/../vendor/autoload.php";

$coverage = new PHP_CodeCoverage();
$coverage->filter()->addDirectoryToWhitelist('/path/to/code');
$coverage->start('Test');

// Generate the report even if `exit` is called
register_shutdown_function(function() use ($coverage){
    $coverage->stop();
    $writer = new PHP_CodeCoverage_Report_HTML;
    $writer->process($coverage, '/tmp/code-coverage-report');
});