* add phpunit as a dev dependency

 * add some basic tests for UrlHelper::rewrite_relative()
 * fix UrlHelper::rewrite_relative() to work better on non-absolute
   relative URL paths

7 files changed, 823 insertions, 0 deletions

diff --git a/vendor/sebastian/environment/ChangeLog.md b/vendor/sebastian/environment/ChangeLog.md
new file mode 100644
index 000000000..67daf0356
--- /dev/null
+++ b/vendor/sebastian/environment/ChangeLog.md
@@ -0,0 +1,169 @@
+# Changes in sebastianbergmann/environment
+
+All notable changes in `sebastianbergmann/environment` are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
+
+## [5.1.3] - 2020-09-28
+
+### Changed
+
+* Changed PHP version constraint in `composer.json` from `^7.3 || ^8.0` to `>=7.3`
+
+## [5.1.2] - 2020-06-26
+
+### Added
+
+* This component is now supported on PHP 8
+
+## [5.1.1] - 2020-06-15
+
+### Changed
+
+* Tests etc. are now ignored for archive exports
+
+## [5.1.0] - 2020-04-14
+
+### Added
+
+* `Runtime::performsJustInTimeCompilation()` returns `true` if PHP 8's JIT is active, `false` otherwise
+
+## [5.0.2] - 2020-03-31
+
+### Fixed
+
+* [#55](https://github.com/sebastianbergmann/environment/issues/55): `stty` command is executed even if no tty is available
+
+## [5.0.1] - 2020-02-19
+
+### Changed
+
+* `Runtime::getNameWithVersionAndCodeCoverageDriver()` now prioritizes PCOV over Xdebug when both extensions are loaded (just like php-code-coverage does)
+
+## [5.0.0] - 2020-02-07
+
+### Removed
+
+* This component is no longer supported on PHP 7.1 and PHP 7.2
+
+## [4.2.3] - 2019-11-20
+
+### Changed
+
+* [#50](https://github.com/sebastianbergmann/environment/pull/50): Windows improvements to console capabilities
+
+### Fixed
+
+* [#49](https://github.com/sebastianbergmann/environment/issues/49): Detection how OpCache handles docblocks does not work correctly when PHPDBG is used
+
+## [4.2.2] - 2019-05-05
+
+### Fixed
+
+* [#44](https://github.com/sebastianbergmann/environment/pull/44): `TypeError` in `Console::getNumberOfColumnsInteractive()`
+
+## [4.2.1] - 2019-04-25
+
+### Fixed
+
+* Fixed an issue in `Runtime::getCurrentSettings()`
+
+## [4.2.0] - 2019-04-25
+
+### Added
+
+* [#36](https://github.com/sebastianbergmann/environment/pull/36): `Runtime::getCurrentSettings()`
+
+## [4.1.0] - 2019-02-01
+
+### Added
+
+* Implemented `Runtime::getNameWithVersionAndCodeCoverageDriver()` method
+* [#34](https://github.com/sebastianbergmann/environment/pull/34): Support for PCOV extension
+
+## [4.0.2] - 2019-01-28
+
+### Fixed
+
+* [#33](https://github.com/sebastianbergmann/environment/issues/33): `Runtime::discardsComments()` returns true too eagerly
+
+### Removed
+
+* Removed support for Zend Optimizer+ in `Runtime::discardsComments()`
+
+## [4.0.1] - 2018-11-25
+
+### Fixed
+
+* [#31](https://github.com/sebastianbergmann/environment/issues/31): Regressions in `Console` class
+
+## [4.0.0] - 2018-10-23 [YANKED]
+
+### Fixed
+
+* [#25](https://github.com/sebastianbergmann/environment/pull/25): `Console::hasColorSupport()` does not work on Windows
+
+### Removed
+
+* This component is no longer supported on PHP 7.0
+
+## [3.1.0] - 2017-07-01
+
+### Added
+
+* [#21](https://github.com/sebastianbergmann/environment/issues/21): Equivalent of `PHP_OS_FAMILY` (for PHP < 7.2) 
+
+## [3.0.4] - 2017-06-20
+
+### Fixed
+
+* [#20](https://github.com/sebastianbergmann/environment/pull/20): PHP 7 mode of HHVM not forced
+
+## [3.0.3] - 2017-05-18
+
+### Fixed
+
+* [#18](https://github.com/sebastianbergmann/environment/issues/18): `Uncaught TypeError: preg_match() expects parameter 2 to be string, null given`
+
+## [3.0.2] - 2017-04-21
+
+### Fixed
+
+* [#17](https://github.com/sebastianbergmann/environment/issues/17): `Uncaught TypeError: trim() expects parameter 1 to be string, boolean given`
+
+## [3.0.1] - 2017-04-21
+
+### Fixed
+
+* Fixed inverted logic in `Runtime::discardsComments()`
+
+## [3.0.0] - 2017-04-21
+
+### Added
+
+* Implemented `Runtime::discardsComments()` for querying whether the PHP runtime discards annotations
+
+### Removed
+
+* This component is no longer supported on PHP 5.6
+
+[5.1.3]: https://github.com/sebastianbergmann/environment/compare/5.1.2...5.1.3
+[5.1.2]: https://github.com/sebastianbergmann/environment/compare/5.1.1...5.1.2
+[5.1.1]: https://github.com/sebastianbergmann/environment/compare/5.1.0...5.1.1
+[5.1.0]: https://github.com/sebastianbergmann/environment/compare/5.0.2...5.1.0
+[5.0.2]: https://github.com/sebastianbergmann/environment/compare/5.0.1...5.0.2
+[5.0.1]: https://github.com/sebastianbergmann/environment/compare/5.0.0...5.0.1
+[5.0.0]: https://github.com/sebastianbergmann/environment/compare/4.2.3...5.0.0
+[4.2.3]: https://github.com/sebastianbergmann/environment/compare/4.2.2...4.2.3
+[4.2.2]: https://github.com/sebastianbergmann/environment/compare/4.2.1...4.2.2
+[4.2.1]: https://github.com/sebastianbergmann/environment/compare/4.2.0...4.2.1
+[4.2.0]: https://github.com/sebastianbergmann/environment/compare/4.1.0...4.2.0
+[4.1.0]: https://github.com/sebastianbergmann/environment/compare/4.0.2...4.1.0
+[4.0.2]: https://github.com/sebastianbergmann/environment/compare/4.0.1...4.0.2
+[4.0.1]: https://github.com/sebastianbergmann/environment/compare/66691f8e2dc4641909166b275a9a4f45c0e89092...4.0.1
+[4.0.0]: https://github.com/sebastianbergmann/environment/compare/3.1.0...66691f8e2dc4641909166b275a9a4f45c0e89092
+[3.1.0]: https://github.com/sebastianbergmann/environment/compare/3.0...3.1.0
+[3.0.4]: https://github.com/sebastianbergmann/environment/compare/3.0.3...3.0.4
+[3.0.3]: https://github.com/sebastianbergmann/environment/compare/3.0.2...3.0.3
+[3.0.2]: https://github.com/sebastianbergmann/environment/compare/3.0.1...3.0.2
+[3.0.1]: https://github.com/sebastianbergmann/environment/compare/3.0.0...3.0.1
+[3.0.0]: https://github.com/sebastianbergmann/environment/compare/2.0...3.0.0
+
diff --git a/vendor/sebastian/environment/LICENSE b/vendor/sebastian/environment/LICENSE
new file mode 100644
index 000000000..c58093991
--- /dev/null
+++ b/vendor/sebastian/environment/LICENSE
@@ -0,0 +1,33 @@
+sebastian/environment
+
+Copyright (c) 2014-2020, Sebastian Bergmann <[email protected]>.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+ * Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in
+   the documentation and/or other materials provided with the
+   distribution.
+
+ * Neither the name of Sebastian Bergmann nor the names of his
+   contributors may be used to endorse or promote products derived
+   from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/sebastian/environment/README.md b/vendor/sebastian/environment/README.md
new file mode 100644
index 000000000..24a9831e4
--- /dev/null
+++ b/vendor/sebastian/environment/README.md
@@ -0,0 +1,22 @@
+# sebastian/environment
+
+[![Latest Stable Version](https://img.shields.io/packagist/v/sebastian/environment.svg?style=flat-square)](https://packagist.org/packages/sebastian/environment)
+[![Minimum PHP Version](https://img.shields.io/badge/php-%3E%3D%207.1-8892BF.svg?style=flat-square)](https://php.net/)
+[![CI Status](https://github.com/sebastianbergmann/environment/workflows/CI/badge.svg)](https://github.com/sebastianbergmann/environment/actions)
+[![Type Coverage](https://shepherd.dev/github/sebastianbergmann/environment/coverage.svg)](https://shepherd.dev/github/sebastianbergmann/environment)
+
+This component provides functionality that helps writing PHP code that has runtime-specific (PHP / HHVM) execution paths.
+
+## Installation
+
+You can add this library as a local, per-project dependency to your project using [Composer](https://getcomposer.org/):
+
+```
+composer require sebastian/environment
+```
+
+If you only need this library during development, for instance to run your project's test suite, then you should add it as a development-time dependency:
+
+```
+composer require --dev sebastian/environment
+```
diff --git a/vendor/sebastian/environment/composer.json b/vendor/sebastian/environment/composer.json
new file mode 100644
index 000000000..d50dcfd78
--- /dev/null
+++ b/vendor/sebastian/environment/composer.json
@@ -0,0 +1,40 @@
+{
+    "name": "sebastian/environment",
+    "description": "Provides functionality to handle HHVM/PHP environments",
+    "keywords": ["environment","hhvm","xdebug"],
+    "homepage": "http://www.github.com/sebastianbergmann/environment",
+    "license": "BSD-3-Clause",
+    "authors": [
+        {
+            "name": "Sebastian Bergmann",
+            "email": "[email protected]"
+        }
+    ],
+    "config": {
+        "platform": {
+            "php": "7.3.0"
+        },
+        "optimize-autoloader": true,
+        "sort-packages": true
+    },
+    "prefer-stable": true,
+    "require": {
+        "php": ">=7.3"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^9.3"
+    },
+    "suggest": {
+        "ext-posix": "*"
+    },
+    "autoload": {
+        "classmap": [
+            "src/"
+        ]
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "5.1-dev"
+        }
+    }
+}
diff --git a/vendor/sebastian/environment/src/Console.php b/vendor/sebastian/environment/src/Console.php
new file mode 100644
index 000000000..c4a2348f0
--- /dev/null
+++ b/vendor/sebastian/environment/src/Console.php
@@ -0,0 +1,189 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/environment.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Environment;
+
+use const DIRECTORY_SEPARATOR;
+use const STDIN;
+use const STDOUT;
+use function defined;
+use function fclose;
+use function fstat;
+use function function_exists;
+use function getenv;
+use function is_resource;
+use function is_string;
+use function posix_isatty;
+use function preg_match;
+use function proc_close;
+use function proc_open;
+use function sapi_windows_vt100_support;
+use function shell_exec;
+use function stream_get_contents;
+use function stream_isatty;
+use function trim;
+
+final class Console
+{
+    /**
+     * @var int
+     */
+    public const STDIN  = 0;
+
+    /**
+     * @var int
+     */
+    public const STDOUT = 1;
+
+    /**
+     * @var int
+     */
+    public const STDERR = 2;
+
+    /**
+     * Returns true if STDOUT supports colorization.
+     *
+     * This code has been copied and adapted from
+     * Symfony\Component\Console\Output\StreamOutput.
+     */
+    public function hasColorSupport(): bool
+    {
+        if ('Hyper' === getenv('TERM_PROGRAM')) {
+            return true;
+        }
+
+        if ($this->isWindows()) {
+            // @codeCoverageIgnoreStart
+            return (defined('STDOUT') && function_exists('sapi_windows_vt100_support') && @sapi_windows_vt100_support(STDOUT))
+                || false !== getenv('ANSICON')
+                || 'ON' === getenv('ConEmuANSI')
+                || 'xterm' === getenv('TERM');
+            // @codeCoverageIgnoreEnd
+        }
+
+        if (!defined('STDOUT')) {
+            // @codeCoverageIgnoreStart
+            return false;
+            // @codeCoverageIgnoreEnd
+        }
+
+        return $this->isInteractive(STDOUT);
+    }
+
+    /**
+     * Returns the number of columns of the terminal.
+     *
+     * @codeCoverageIgnore
+     */
+    public function getNumberOfColumns(): int
+    {
+        if (!$this->isInteractive(defined('STDIN') ? STDIN : self::STDIN)) {
+            return 80;
+        }
+
+        if ($this->isWindows()) {
+            return $this->getNumberOfColumnsWindows();
+        }
+
+        return $this->getNumberOfColumnsInteractive();
+    }
+
+    /**
+     * Returns if the file descriptor is an interactive terminal or not.
+     *
+     * Normally, we want to use a resource as a parameter, yet sadly it's not always awailable,
+     * eg when running code in interactive console (`php -a`), STDIN/STDOUT/STDERR constants are not defined.
+     *
+     * @param int|resource $fileDescriptor
+     */
+    public function isInteractive($fileDescriptor = self::STDOUT): bool
+    {
+        if (is_resource($fileDescriptor)) {
+            // These functions require a descriptor that is a real resource, not a numeric ID of it
+            if (function_exists('stream_isatty') && @stream_isatty($fileDescriptor)) {
+                return true;
+            }
+
+            // Check if formatted mode is S_IFCHR
+            if (function_exists('fstat') && @stream_isatty($fileDescriptor)) {
+                $stat = @fstat(STDOUT);
+
+                return $stat ? 0020000 === ($stat['mode'] & 0170000) : false;
+            }
+
+            return false;
+        }
+
+        return function_exists('posix_isatty') && @posix_isatty($fileDescriptor);
+    }
+
+    private function isWindows(): bool
+    {
+        return DIRECTORY_SEPARATOR === '\\';
+    }
+
+    /**
+     * @codeCoverageIgnore
+     */
+    private function getNumberOfColumnsInteractive(): int
+    {
+        if (function_exists('shell_exec') && preg_match('#\d+ (\d+)#', shell_exec('stty size') ?: '', $match) === 1) {
+            if ((int) $match[1] > 0) {
+                return (int) $match[1];
+            }
+        }
+
+        if (function_exists('shell_exec') && preg_match('#columns = (\d+);#', shell_exec('stty') ?: '', $match) === 1) {
+            if ((int) $match[1] > 0) {
+                return (int) $match[1];
+            }
+        }
+
+        return 80;
+    }
+
+    /**
+     * @codeCoverageIgnore
+     */
+    private function getNumberOfColumnsWindows(): int
+    {
+        $ansicon = getenv('ANSICON');
+        $columns = 80;
+
+        if (is_string($ansicon) && preg_match('/^(\d+)x\d+ \(\d+x(\d+)\)$/', trim($ansicon), $matches)) {
+            $columns = (int) $matches[1];
+        } elseif (function_exists('proc_open')) {
+            $process = proc_open(
+                'mode CON',
+                [
+                    1 => ['pipe', 'w'],
+                    2 => ['pipe', 'w'],
+                ],
+                $pipes,
+                null,
+                null,
+                ['suppress_errors' => true]
+            );
+
+            if (is_resource($process)) {
+                $info = stream_get_contents($pipes[1]);
+
+                fclose($pipes[1]);
+                fclose($pipes[2]);
+                proc_close($process);
+
+                if (preg_match('/--------+\r?\n.+?(\d+)\r?\n.+?(\d+)\r?\n/', $info, $matches)) {
+                    $columns = (int) $matches[2];
+                }
+            }
+        }
+
+        return $columns - 1;
+    }
+}
diff --git a/vendor/sebastian/environment/src/OperatingSystem.php b/vendor/sebastian/environment/src/OperatingSystem.php
new file mode 100644
index 000000000..1f3ebca7c
--- /dev/null
+++ b/vendor/sebastian/environment/src/OperatingSystem.php
@@ -0,0 +1,53 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/environment.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Environment;
+
+use const DIRECTORY_SEPARATOR;
+use const PHP_OS;
+use const PHP_OS_FAMILY;
+use function defined;
+
+final class OperatingSystem
+{
+    /**
+     * Returns PHP_OS_FAMILY (if defined (which it is on PHP >= 7.2)).
+     * Returns a string (compatible with PHP_OS_FAMILY) derived from PHP_OS otherwise.
+     */
+    public function getFamily(): string
+    {
+        if (defined('PHP_OS_FAMILY')) {
+            return PHP_OS_FAMILY;
+        }
+
+        if (DIRECTORY_SEPARATOR === '\\') {
+            return 'Windows';
+        }
+
+        switch (PHP_OS) {
+            case 'Darwin':
+                return 'Darwin';
+
+            case 'DragonFly':
+            case 'FreeBSD':
+            case 'NetBSD':
+            case 'OpenBSD':
+                return 'BSD';
+
+            case 'Linux':
+                return 'Linux';
+
+            case 'SunOS':
+                return 'Solaris';
+
+            default:
+                return 'Unknown';
+        }
+    }
+}
diff --git a/vendor/sebastian/environment/src/Runtime.php b/vendor/sebastian/environment/src/Runtime.php
new file mode 100644
index 000000000..311aefcb6
--- /dev/null
+++ b/vendor/sebastian/environment/src/Runtime.php
@@ -0,0 +1,317 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/environment.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Environment;
+
+use const PHP_BINARY;
+use const PHP_BINDIR;
+use const PHP_MAJOR_VERSION;
+use const PHP_SAPI;
+use const PHP_VERSION;
+use function array_map;
+use function array_merge;
+use function defined;
+use function escapeshellarg;
+use function explode;
+use function extension_loaded;
+use function getenv;
+use function ini_get;
+use function is_readable;
+use function parse_ini_file;
+use function php_ini_loaded_file;
+use function php_ini_scanned_files;
+use function phpversion;
+use function sprintf;
+use function strpos;
+
+/**
+ * Utility class for HHVM/PHP environment handling.
+ */
+final class Runtime
+{
+    /**
+     * @var string
+     */
+    private static $binary;
+
+    /**
+     * Returns true when Xdebug or PCOV is available or
+     * the runtime used is PHPDBG.
+     */
+    public function canCollectCodeCoverage(): bool
+    {
+        return $this->hasXdebug() || $this->hasPCOV() || $this->hasPHPDBGCodeCoverage();
+    }
+
+    /**
+     * Returns true when Zend OPcache is loaded, enabled,
+     * and is configured to discard comments.
+     */
+    public function discardsComments(): bool
+    {
+        if (!$this->isOpcacheActive()) {
+            return false;
+        }
+
+        if (ini_get('opcache.save_comments') !== '0') {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Returns true when Zend OPcache is loaded, enabled,
+     * and is configured to perform just-in-time compilation.
+     */
+    public function performsJustInTimeCompilation(): bool
+    {
+        if (PHP_MAJOR_VERSION < 8) {
+            return false;
+        }
+
+        if (!$this->isOpcacheActive()) {
+            return false;
+        }
+
+        if (strpos(ini_get('opcache.jit'), '0') === 0) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Returns the path to the binary of the current runtime.
+     * Appends ' --php' to the path when the runtime is HHVM.
+     */
+    public function getBinary(): string
+    {
+        // HHVM
+        if (self::$binary === null && $this->isHHVM()) {
+            // @codeCoverageIgnoreStart
+            if ((self::$binary = getenv('PHP_BINARY')) === false) {
+                self::$binary = PHP_BINARY;
+            }
+
+            self::$binary = escapeshellarg(self::$binary) . ' --php' .
+                ' -d hhvm.php7.all=1';
+            // @codeCoverageIgnoreEnd
+        }
+
+        if (self::$binary === null && PHP_BINARY !== '') {
+            self::$binary = escapeshellarg(PHP_BINARY);
+        }
+
+        if (self::$binary === null) {
+            // @codeCoverageIgnoreStart
+            $possibleBinaryLocations = [
+                PHP_BINDIR . '/php',
+                PHP_BINDIR . '/php-cli.exe',
+                PHP_BINDIR . '/php.exe',
+            ];
+
+            foreach ($possibleBinaryLocations as $binary) {
+                if (is_readable($binary)) {
+                    self::$binary = escapeshellarg($binary);
+
+                    break;
+                }
+            }
+            // @codeCoverageIgnoreEnd
+        }
+
+        if (self::$binary === null) {
+            // @codeCoverageIgnoreStart
+            self::$binary = 'php';
+            // @codeCoverageIgnoreEnd
+        }
+
+        return self::$binary;
+    }
+
+    public function getNameWithVersion(): string
+    {
+        return $this->getName() . ' ' . $this->getVersion();
+    }
+
+    public function getNameWithVersionAndCodeCoverageDriver(): string
+    {
+        if (!$this->canCollectCodeCoverage() || $this->hasPHPDBGCodeCoverage()) {
+            return $this->getNameWithVersion();
+        }
+
+        if ($this->hasPCOV()) {
+            return sprintf(
+                '%s with PCOV %s',
+                $this->getNameWithVersion(),
+                phpversion('pcov')
+            );
+        }
+
+        if ($this->hasXdebug()) {
+            return sprintf(
+                '%s with Xdebug %s',
+                $this->getNameWithVersion(),
+                phpversion('xdebug')
+            );
+        }
+    }
+
+    public function getName(): string
+    {
+        if ($this->isHHVM()) {
+            // @codeCoverageIgnoreStart
+            return 'HHVM';
+            // @codeCoverageIgnoreEnd
+        }
+
+        if ($this->isPHPDBG()) {
+            // @codeCoverageIgnoreStart
+            return 'PHPDBG';
+            // @codeCoverageIgnoreEnd
+        }
+
+        return 'PHP';
+    }
+
+    public function getVendorUrl(): string
+    {
+        if ($this->isHHVM()) {
+            // @codeCoverageIgnoreStart
+            return 'http://hhvm.com/';
+            // @codeCoverageIgnoreEnd
+        }
+
+        return 'https://secure.php.net/';
+    }
+
+    public function getVersion(): string
+    {
+        if ($this->isHHVM()) {
+            // @codeCoverageIgnoreStart
+            return HHVM_VERSION;
+            // @codeCoverageIgnoreEnd
+        }
+
+        return PHP_VERSION;
+    }
+
+    /**
+     * Returns true when the runtime used is PHP and Xdebug is loaded.
+     */
+    public function hasXdebug(): bool
+    {
+        return ($this->isPHP() || $this->isHHVM()) && extension_loaded('xdebug');
+    }
+
+    /**
+     * Returns true when the runtime used is HHVM.
+     */
+    public function isHHVM(): bool
+    {
+        return defined('HHVM_VERSION');
+    }
+
+    /**
+     * Returns true when the runtime used is PHP without the PHPDBG SAPI.
+     */
+    public function isPHP(): bool
+    {
+        return !$this->isHHVM() && !$this->isPHPDBG();
+    }
+
+    /**
+     * Returns true when the runtime used is PHP with the PHPDBG SAPI.
+     */
+    public function isPHPDBG(): bool
+    {
+        return PHP_SAPI === 'phpdbg' && !$this->isHHVM();
+    }
+
+    /**
+     * Returns true when the runtime used is PHP with the PHPDBG SAPI
+     * and the phpdbg_*_oplog() functions are available (PHP >= 7.0).
+     */
+    public function hasPHPDBGCodeCoverage(): bool
+    {
+        return $this->isPHPDBG();
+    }
+
+    /**
+     * Returns true when the runtime used is PHP with PCOV loaded and enabled.
+     */
+    public function hasPCOV(): bool
+    {
+        return $this->isPHP() && extension_loaded('pcov') && ini_get('pcov.enabled');
+    }
+
+    /**
+     * Parses the loaded php.ini file (if any) as well as all
+     * additional php.ini files from the additional ini dir for
+     * a list of all configuration settings loaded from files
+     * at startup. Then checks for each php.ini setting passed
+     * via the `$values` parameter whether this setting has
+     * been changed at runtime. Returns an array of strings
+     * where each string has the format `key=value` denoting
+     * the name of a changed php.ini setting with its new value.
+     *
+     * @return string[]
+     */
+    public function getCurrentSettings(array $values): array
+    {
+        $diff  = [];
+        $files = [];
+
+        if ($file = php_ini_loaded_file()) {
+            $files[] = $file;
+        }
+
+        if ($scanned = php_ini_scanned_files()) {
+            $files = array_merge(
+                $files,
+                array_map(
+                    'trim',
+                    explode(",\n", $scanned)
+                )
+            );
+        }
+
+        foreach ($files as $ini) {
+            $config = parse_ini_file($ini, true);
+
+            foreach ($values as $value) {
+                $set = ini_get($value);
+
+                if (isset($config[$value]) && $set != $config[$value]) {
+                    $diff[] = sprintf('%s=%s', $value, $set);
+                }
+            }
+        }
+
+        return $diff;
+    }
+
+    private function isOpcacheActive(): bool
+    {
+        if (!extension_loaded('Zend OPcache')) {
+            return false;
+        }
+
+        if ((PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') && ini_get('opcache.enable_cli') === '1') {
+            return true;
+        }
+
+        if (PHP_SAPI !== 'cli' && PHP_SAPI !== 'phpdbg' && ini_get('opcache.enable') === '1') {
+            return true;
+        }
+
+        return false;
+    }
+}