Add XDebug 3.x workaround

Author: mmoll

.travis.yml

@@ -38,7 +38,12 @@ script:
   - vendor/bin/phpstan analyse --no-progress # Run PHPStan
   - vendor/bin/psalm --show-info=false # run psalm
   - if [ "${DEPENDENCIES}" = "highest" ]; then vendor/bin/phan; fi; # Run phan
-  - if [ "${TRAVIS_PHP_VERSION}" != "7.3" ]; then php -d zend_extension=xdebug.so vendor/bin/phpunit --coverage-clover=coverage.xml; fi; # Generate Code coverage report
+  # Generate Code coverage report
+  - |
+    if [ "${TRAVIS_PHP_VERSION}" == "7.4" ] && [ "${DEPENDENCIES}" = "highest" ]; then
+      echo 'xdebug.mode = "coverage"' >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
+      php -d zend_extension=xdebug.so vendor/bin/phpunit --coverage-clover=coverage.xml
+    fi
 
 jobs:
   include:

tests/bootstrap.php

@@ -37,3 +37,20 @@ static function ($v) use ($myStandardName): bool {
 );
 
 putenv("PHPCS_IGNORE_TESTS={$ignoredStandardsStr}");
+
+/*
+ * PHPUnit 9.3 is the first version which supports Xdebug 3, but we're using older versions.
+ *
+ * For now, until a fix is pulled into the whole stack, this will allow older PHPUnit
+ * versions to run with Xdebug 3 for code coverage.
+ */
+
+if ((\extension_loaded('xdebug') === true) && (\version_compare((string) \phpversion('xdebug'), '3', '>=') === true)) {
+    if (defined('XDEBUG_CC_UNUSED') === false) {
+        define('XDEBUG_CC_UNUSED', null);
+    }
+
+    if (defined('XDEBUG_CC_DEAD_CODE') === false) {
+        define('XDEBUG_CC_DEAD_CODE', null);
+    }
+}