diff --git a/namespaces/composer.json b/namespaces/composer.json
new file mode 100644
index 0000000..c383b07
--- /dev/null
+++ b/namespaces/composer.json
@@ -0,0 +1,21 @@
+{
+ "name": "test/composer",
+ "description": "LerningToUseComposer",
+ "license": "none",
+ "autoload": {
+ "psr-4": {
+ "Test\\Composer\\": "src/",
+ "foo\\": "src/",
+ "bar\\": "src/",
+ "animate\\": "src/"
+ }
+ },
+ "authors": [
+ {
+ "name": "Aleksandr Shelkovin",
+ "email": "shelkovin.sashka@gmail.com"
+ }
+ ],
+ "minimum-stability": "alpha",
+ "require": {}
+}
diff --git a/namespaces/src/Animal.php b/namespaces/src/Animal.php
new file mode 100644
index 0000000..faa5c9d
--- /dev/null
+++ b/namespaces/src/Animal.php
@@ -0,0 +1,3 @@
+
\ No newline at end of file
diff --git a/namespaces/src/Cat.php b/namespaces/src/Cat.php
new file mode 100644
index 0000000..5f7005a
--- /dev/null
+++ b/namespaces/src/Cat.php
@@ -0,0 +1,3 @@
+
\ No newline at end of file
diff --git a/namespaces/src/Dog.php b/namespaces/src/Dog.php
new file mode 100644
index 0000000..d14d4e1
--- /dev/null
+++ b/namespaces/src/Dog.php
@@ -0,0 +1,3 @@
+
\ No newline at end of file
diff --git a/namespaces/src/file4.php b/namespaces/src/file4.php
new file mode 100644
index 0000000..e0cda35
--- /dev/null
+++ b/namespaces/src/file4.php
@@ -0,0 +1,12 @@
+\n";
+ echo canine\Dog::says(), "
\n";
+ echo \animate\Animal::breathes(), "
\n"; ?>
\ No newline at end of file
diff --git a/namespaces/src/index.php b/namespaces/src/index.php
new file mode 100644
index 0000000..e69de29
diff --git a/namespaces/vendor/autoload.php b/namespaces/vendor/autoload.php
new file mode 100644
index 0000000..15a1427
--- /dev/null
+++ b/namespaces/vendor/autoload.php
@@ -0,0 +1,25 @@
+
+ * Jordi Boggiano
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Autoload;
+
+/**
+ * ClassLoader implements a PSR-0, PSR-4 and classmap class loader.
+ *
+ * $loader = new \Composer\Autoload\ClassLoader();
+ *
+ * // register classes with namespaces
+ * $loader->add('Symfony\Component', __DIR__.'/component');
+ * $loader->add('Symfony', __DIR__.'/framework');
+ *
+ * // activate the autoloader
+ * $loader->register();
+ *
+ * // to enable searching the include path (eg. for PEAR packages)
+ * $loader->setUseIncludePath(true);
+ *
+ * In this example, if you try to use a class in the Symfony\Component
+ * namespace or one of its children (Symfony\Component\Console for instance),
+ * the autoloader will first look for the class under the component/
+ * directory, and it will then fallback to the framework/ directory if not
+ * found before giving up.
+ *
+ * This class is loosely based on the Symfony UniversalClassLoader.
+ *
+ * @author Fabien Potencier
+ * @author Jordi Boggiano
+ * @see https://www.php-fig.org/psr/psr-0/
+ * @see https://www.php-fig.org/psr/psr-4/
+ */
+class ClassLoader
+{
+ /** @var \Closure(string):void */
+ private static $includeFile;
+
+ /** @var string|null */
+ private $vendorDir;
+
+ // PSR-4
+ /**
+ * @var array>
+ */
+ private $prefixLengthsPsr4 = array();
+ /**
+ * @var array>
+ */
+ private $prefixDirsPsr4 = array();
+ /**
+ * @var list
+ */
+ private $fallbackDirsPsr4 = array();
+
+ // PSR-0
+ /**
+ * List of PSR-0 prefixes
+ *
+ * Structured as array('F (first letter)' => array('Foo\Bar (full prefix)' => array('path', 'path2')))
+ *
+ * @var array>>
+ */
+ private $prefixesPsr0 = array();
+ /**
+ * @var list
+ */
+ private $fallbackDirsPsr0 = array();
+
+ /** @var bool */
+ private $useIncludePath = false;
+
+ /**
+ * @var array
+ */
+ private $classMap = array();
+
+ /** @var bool */
+ private $classMapAuthoritative = false;
+
+ /**
+ * @var array
+ */
+ private $missingClasses = array();
+
+ /** @var string|null */
+ private $apcuPrefix;
+
+ /**
+ * @var array
+ */
+ private static $registeredLoaders = array();
+
+ /**
+ * @param string|null $vendorDir
+ */
+ public function __construct($vendorDir = null)
+ {
+ $this->vendorDir = $vendorDir;
+ self::initializeIncludeClosure();
+ }
+
+ /**
+ * @return array>
+ */
+ public function getPrefixes()
+ {
+ if (!empty($this->prefixesPsr0)) {
+ return call_user_func_array('array_merge', array_values($this->prefixesPsr0));
+ }
+
+ return array();
+ }
+
+ /**
+ * @return array>
+ */
+ public function getPrefixesPsr4()
+ {
+ return $this->prefixDirsPsr4;
+ }
+
+ /**
+ * @return list
+ */
+ public function getFallbackDirs()
+ {
+ return $this->fallbackDirsPsr0;
+ }
+
+ /**
+ * @return list
+ */
+ public function getFallbackDirsPsr4()
+ {
+ return $this->fallbackDirsPsr4;
+ }
+
+ /**
+ * @return array Array of classname => path
+ */
+ public function getClassMap()
+ {
+ return $this->classMap;
+ }
+
+ /**
+ * @param array $classMap Class to filename map
+ *
+ * @return void
+ */
+ public function addClassMap(array $classMap)
+ {
+ if ($this->classMap) {
+ $this->classMap = array_merge($this->classMap, $classMap);
+ } else {
+ $this->classMap = $classMap;
+ }
+ }
+
+ /**
+ * Registers a set of PSR-0 directories for a given prefix, either
+ * appending or prepending to the ones previously set for this prefix.
+ *
+ * @param string $prefix The prefix
+ * @param list|string $paths The PSR-0 root directories
+ * @param bool $prepend Whether to prepend the directories
+ *
+ * @return void
+ */
+ public function add($prefix, $paths, $prepend = false)
+ {
+ $paths = (array) $paths;
+ if (!$prefix) {
+ if ($prepend) {
+ $this->fallbackDirsPsr0 = array_merge(
+ $paths,
+ $this->fallbackDirsPsr0
+ );
+ } else {
+ $this->fallbackDirsPsr0 = array_merge(
+ $this->fallbackDirsPsr0,
+ $paths
+ );
+ }
+
+ return;
+ }
+
+ $first = $prefix[0];
+ if (!isset($this->prefixesPsr0[$first][$prefix])) {
+ $this->prefixesPsr0[$first][$prefix] = $paths;
+
+ return;
+ }
+ if ($prepend) {
+ $this->prefixesPsr0[$first][$prefix] = array_merge(
+ $paths,
+ $this->prefixesPsr0[$first][$prefix]
+ );
+ } else {
+ $this->prefixesPsr0[$first][$prefix] = array_merge(
+ $this->prefixesPsr0[$first][$prefix],
+ $paths
+ );
+ }
+ }
+
+ /**
+ * Registers a set of PSR-4 directories for a given namespace, either
+ * appending or prepending to the ones previously set for this namespace.
+ *
+ * @param string $prefix The prefix/namespace, with trailing '\\'
+ * @param list|string $paths The PSR-4 base directories
+ * @param bool $prepend Whether to prepend the directories
+ *
+ * @throws \InvalidArgumentException
+ *
+ * @return void
+ */
+ public function addPsr4($prefix, $paths, $prepend = false)
+ {
+ $paths = (array) $paths;
+ if (!$prefix) {
+ // Register directories for the root namespace.
+ if ($prepend) {
+ $this->fallbackDirsPsr4 = array_merge(
+ $paths,
+ $this->fallbackDirsPsr4
+ );
+ } else {
+ $this->fallbackDirsPsr4 = array_merge(
+ $this->fallbackDirsPsr4,
+ $paths
+ );
+ }
+ } elseif (!isset($this->prefixDirsPsr4[$prefix])) {
+ // Register directories for a new namespace.
+ $length = strlen($prefix);
+ if ('\\' !== $prefix[$length - 1]) {
+ throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
+ }
+ $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
+ $this->prefixDirsPsr4[$prefix] = $paths;
+ } elseif ($prepend) {
+ // Prepend directories for an already registered namespace.
+ $this->prefixDirsPsr4[$prefix] = array_merge(
+ $paths,
+ $this->prefixDirsPsr4[$prefix]
+ );
+ } else {
+ // Append directories for an already registered namespace.
+ $this->prefixDirsPsr4[$prefix] = array_merge(
+ $this->prefixDirsPsr4[$prefix],
+ $paths
+ );
+ }
+ }
+
+ /**
+ * Registers a set of PSR-0 directories for a given prefix,
+ * replacing any others previously set for this prefix.
+ *
+ * @param string $prefix The prefix
+ * @param list|string $paths The PSR-0 base directories
+ *
+ * @return void
+ */
+ public function set($prefix, $paths)
+ {
+ if (!$prefix) {
+ $this->fallbackDirsPsr0 = (array) $paths;
+ } else {
+ $this->prefixesPsr0[$prefix[0]][$prefix] = (array) $paths;
+ }
+ }
+
+ /**
+ * Registers a set of PSR-4 directories for a given namespace,
+ * replacing any others previously set for this namespace.
+ *
+ * @param string $prefix The prefix/namespace, with trailing '\\'
+ * @param list|string $paths The PSR-4 base directories
+ *
+ * @throws \InvalidArgumentException
+ *
+ * @return void
+ */
+ public function setPsr4($prefix, $paths)
+ {
+ if (!$prefix) {
+ $this->fallbackDirsPsr4 = (array) $paths;
+ } else {
+ $length = strlen($prefix);
+ if ('\\' !== $prefix[$length - 1]) {
+ throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
+ }
+ $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
+ $this->prefixDirsPsr4[$prefix] = (array) $paths;
+ }
+ }
+
+ /**
+ * Turns on searching the include path for class files.
+ *
+ * @param bool $useIncludePath
+ *
+ * @return void
+ */
+ public function setUseIncludePath($useIncludePath)
+ {
+ $this->useIncludePath = $useIncludePath;
+ }
+
+ /**
+ * Can be used to check if the autoloader uses the include path to check
+ * for classes.
+ *
+ * @return bool
+ */
+ public function getUseIncludePath()
+ {
+ return $this->useIncludePath;
+ }
+
+ /**
+ * Turns off searching the prefix and fallback directories for classes
+ * that have not been registered with the class map.
+ *
+ * @param bool $classMapAuthoritative
+ *
+ * @return void
+ */
+ public function setClassMapAuthoritative($classMapAuthoritative)
+ {
+ $this->classMapAuthoritative = $classMapAuthoritative;
+ }
+
+ /**
+ * Should class lookup fail if not found in the current class map?
+ *
+ * @return bool
+ */
+ public function isClassMapAuthoritative()
+ {
+ return $this->classMapAuthoritative;
+ }
+
+ /**
+ * APCu prefix to use to cache found/not-found classes, if the extension is enabled.
+ *
+ * @param string|null $apcuPrefix
+ *
+ * @return void
+ */
+ public function setApcuPrefix($apcuPrefix)
+ {
+ $this->apcuPrefix = function_exists('apcu_fetch') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) ? $apcuPrefix : null;
+ }
+
+ /**
+ * The APCu prefix in use, or null if APCu caching is not enabled.
+ *
+ * @return string|null
+ */
+ public function getApcuPrefix()
+ {
+ return $this->apcuPrefix;
+ }
+
+ /**
+ * Registers this instance as an autoloader.
+ *
+ * @param bool $prepend Whether to prepend the autoloader or not
+ *
+ * @return void
+ */
+ public function register($prepend = false)
+ {
+ spl_autoload_register(array($this, 'loadClass'), true, $prepend);
+
+ if (null === $this->vendorDir) {
+ return;
+ }
+
+ if ($prepend) {
+ self::$registeredLoaders = array($this->vendorDir => $this) + self::$registeredLoaders;
+ } else {
+ unset(self::$registeredLoaders[$this->vendorDir]);
+ self::$registeredLoaders[$this->vendorDir] = $this;
+ }
+ }
+
+ /**
+ * Unregisters this instance as an autoloader.
+ *
+ * @return void
+ */
+ public function unregister()
+ {
+ spl_autoload_unregister(array($this, 'loadClass'));
+
+ if (null !== $this->vendorDir) {
+ unset(self::$registeredLoaders[$this->vendorDir]);
+ }
+ }
+
+ /**
+ * Loads the given class or interface.
+ *
+ * @param string $class The name of the class
+ * @return true|null True if loaded, null otherwise
+ */
+ public function loadClass($class)
+ {
+ if ($file = $this->findFile($class)) {
+ $includeFile = self::$includeFile;
+ $includeFile($file);
+
+ return true;
+ }
+
+ return null;
+ }
+
+ /**
+ * Finds the path to the file where the class is defined.
+ *
+ * @param string $class The name of the class
+ *
+ * @return string|false The path if found, false otherwise
+ */
+ public function findFile($class)
+ {
+ // class map lookup
+ if (isset($this->classMap[$class])) {
+ return $this->classMap[$class];
+ }
+ if ($this->classMapAuthoritative || isset($this->missingClasses[$class])) {
+ return false;
+ }
+ if (null !== $this->apcuPrefix) {
+ $file = apcu_fetch($this->apcuPrefix.$class, $hit);
+ if ($hit) {
+ return $file;
+ }
+ }
+
+ $file = $this->findFileWithExtension($class, '.php');
+
+ // Search for Hack files if we are running on HHVM
+ if (false === $file && defined('HHVM_VERSION')) {
+ $file = $this->findFileWithExtension($class, '.hh');
+ }
+
+ if (null !== $this->apcuPrefix) {
+ apcu_add($this->apcuPrefix.$class, $file);
+ }
+
+ if (false === $file) {
+ // Remember that this class does not exist.
+ $this->missingClasses[$class] = true;
+ }
+
+ return $file;
+ }
+
+ /**
+ * Returns the currently registered loaders keyed by their corresponding vendor directories.
+ *
+ * @return array
+ */
+ public static function getRegisteredLoaders()
+ {
+ return self::$registeredLoaders;
+ }
+
+ /**
+ * @param string $class
+ * @param string $ext
+ * @return string|false
+ */
+ private function findFileWithExtension($class, $ext)
+ {
+ // PSR-4 lookup
+ $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;
+
+ $first = $class[0];
+ if (isset($this->prefixLengthsPsr4[$first])) {
+ $subPath = $class;
+ while (false !== $lastPos = strrpos($subPath, '\\')) {
+ $subPath = substr($subPath, 0, $lastPos);
+ $search = $subPath . '\\';
+ if (isset($this->prefixDirsPsr4[$search])) {
+ $pathEnd = DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $lastPos + 1);
+ foreach ($this->prefixDirsPsr4[$search] as $dir) {
+ if (file_exists($file = $dir . $pathEnd)) {
+ return $file;
+ }
+ }
+ }
+ }
+ }
+
+ // PSR-4 fallback dirs
+ foreach ($this->fallbackDirsPsr4 as $dir) {
+ if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr4)) {
+ return $file;
+ }
+ }
+
+ // PSR-0 lookup
+ if (false !== $pos = strrpos($class, '\\')) {
+ // namespaced class name
+ $logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1)
+ . strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR);
+ } else {
+ // PEAR-like class name
+ $logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . $ext;
+ }
+
+ if (isset($this->prefixesPsr0[$first])) {
+ foreach ($this->prefixesPsr0[$first] as $prefix => $dirs) {
+ if (0 === strpos($class, $prefix)) {
+ foreach ($dirs as $dir) {
+ if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
+ return $file;
+ }
+ }
+ }
+ }
+ }
+
+ // PSR-0 fallback dirs
+ foreach ($this->fallbackDirsPsr0 as $dir) {
+ if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
+ return $file;
+ }
+ }
+
+ // PSR-0 include paths.
+ if ($this->useIncludePath && $file = stream_resolve_include_path($logicalPathPsr0)) {
+ return $file;
+ }
+
+ return false;
+ }
+
+ /**
+ * @return void
+ */
+ private static function initializeIncludeClosure()
+ {
+ if (self::$includeFile !== null) {
+ return;
+ }
+
+ /**
+ * Scope isolated include.
+ *
+ * Prevents access to $this/self from included files.
+ *
+ * @param string $file
+ * @return void
+ */
+ self::$includeFile = \Closure::bind(static function($file) {
+ include $file;
+ }, null, null);
+ }
+}
diff --git a/namespaces/vendor/composer/LICENSE b/namespaces/vendor/composer/LICENSE
new file mode 100644
index 0000000..f27399a
--- /dev/null
+++ b/namespaces/vendor/composer/LICENSE
@@ -0,0 +1,21 @@
+
+Copyright (c) Nils Adermann, Jordi Boggiano
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
diff --git a/namespaces/vendor/composer/autoload_classmap.php b/namespaces/vendor/composer/autoload_classmap.php
new file mode 100644
index 0000000..0fb0a2c
--- /dev/null
+++ b/namespaces/vendor/composer/autoload_classmap.php
@@ -0,0 +1,10 @@
+ $vendorDir . '/composer/InstalledVersions.php',
+);
diff --git a/namespaces/vendor/composer/autoload_namespaces.php b/namespaces/vendor/composer/autoload_namespaces.php
new file mode 100644
index 0000000..15a2ff3
--- /dev/null
+++ b/namespaces/vendor/composer/autoload_namespaces.php
@@ -0,0 +1,9 @@
+ array($baseDir . '/src'),
+ 'foo\\' => array($baseDir . '/src')
+
+);
diff --git a/namespaces/vendor/composer/autoload_real.php b/namespaces/vendor/composer/autoload_real.php
new file mode 100644
index 0000000..980342c
--- /dev/null
+++ b/namespaces/vendor/composer/autoload_real.php
@@ -0,0 +1,36 @@
+register(true);
+
+ return $loader;
+ }
+}
diff --git a/namespaces/vendor/composer/autoload_static.php b/namespaces/vendor/composer/autoload_static.php
new file mode 100644
index 0000000..f97946c
--- /dev/null
+++ b/namespaces/vendor/composer/autoload_static.php
@@ -0,0 +1,36 @@
+
+ array (
+ 'Test\\Composer\\' => 14,
+ ),
+ );
+
+ public static $prefixDirsPsr4 = array (
+ 'Test\\Composer\\' =>
+ array (
+ 0 => __DIR__ . '/../..' . '/src',
+ ),
+ );
+
+ public static $classMap = array (
+ 'Composer\\InstalledVersions' => __DIR__ . '/..' . '/composer/InstalledVersions.php',
+ );
+
+ public static function getInitializer(ClassLoader $loader)
+ {
+ return \Closure::bind(function () use ($loader) {
+ $loader->prefixLengthsPsr4 = ComposerStaticInit2e7cd1363324112d4b60799a2fbe62e1::$prefixLengthsPsr4;
+ $loader->prefixDirsPsr4 = ComposerStaticInit2e7cd1363324112d4b60799a2fbe62e1::$prefixDirsPsr4;
+ $loader->classMap = ComposerStaticInit2e7cd1363324112d4b60799a2fbe62e1::$classMap;
+
+ }, null, ClassLoader::class);
+ }
+}