Always import classes.

src/Cache/Engine/FileEngine.php

@@ -18,6 +18,10 @@
 use Cake\Utility\Inflector;
 use Exception;
 use LogicException;
+use RecursiveDirectoryIterator;
+use RecursiveIteratorIterator;
+use SplFileInfo;
+use SplFileObject;
 
 /**
  * File Storage engine for cache. Filestorage is the slowest cache storage
@@ -264,10 +268,10 @@ public function clear($check)
 
         $this->_clearDirectory($this->_config['path'], $now, $threshold);
 
-        $directory = new \RecursiveDirectoryIterator($this->_config['path']);
-        $contents = new \RecursiveIteratorIterator(
+        $directory = new RecursiveDirectoryIterator($this->_config['path']);
+        $contents = new RecursiveIteratorIterator(
             $directory,
-            \RecursiveIteratorIterator::SELF_FIRST
+            RecursiveIteratorIterator::SELF_FIRST
         );
         $cleared = [];
         foreach ($contents as $path) {
@@ -306,7 +310,7 @@ protected function _clearDirectory($path, $now, $threshold)
             }
 
             try {
-                $file = new \SplFileObject($path . $entry, 'r');
+                $file = new SplFileObject($path . $entry, 'r');
             } catch (Exception $e) {
                 continue;
             }
@@ -378,7 +382,7 @@ protected function _setKey($key, $createKey = false)
         if (!is_dir($dir)) {
             mkdir($dir, 0775, true);
         }
-        $path = new \SplFileInfo($dir . $key);
+        $path = new SplFileInfo($dir . $key);
 
         if (!$createKey && !$path->isFile()) {
             return false;
@@ -411,7 +415,7 @@ protected function _setKey($key, $createKey = false)
      */
     protected function _active()
     {
-        $dir = new \SplFileInfo($this->_config['path']);
+        $dir = new SplFileInfo($this->_config['path']);
         $path = $dir->getPathname();
         if (!is_dir($path)) {
             mkdir($path, 0775, true);
@@ -457,10 +461,10 @@ public function key($key)
     public function clearGroup($group)
     {
         $this->_File = null;
-        $directoryIterator = new \RecursiveDirectoryIterator($this->_config['path']);
-        $contents = new \RecursiveIteratorIterator(
+        $directoryIterator = new RecursiveDirectoryIterator($this->_config['path']);
+        $contents = new RecursiveIteratorIterator(
             $directoryIterator,
-            \RecursiveIteratorIterator::CHILD_FIRST
+            RecursiveIteratorIterator::CHILD_FIRST
         );
         foreach ($contents as $object) {
             $containsGroup = strpos($object->getPathname(), DS . $group . DS) !== false;

src/Collection/Collection.php

@@ -18,6 +18,7 @@
 use InvalidArgumentException;
 use IteratorIterator;
 use Serializable;
+use Traversable;
 
 /**
  * A collection is an immutable list of elements with a handful of functions to
@@ -40,7 +41,7 @@ public function __construct($items)
             $items = new ArrayIterator($items);
         }
 
-        if (!($items instanceof \Traversable)) {
+        if (!($items instanceof Traversable)) {
             $msg = 'Only an array or \Traversable is allowed for Collection';
             throw new InvalidArgumentException($msg);
         }

src/Collection/CollectionTrait.php

@@ -31,6 +31,7 @@
 use Countable;
 use LimitIterator;
 use RecursiveIteratorIterator;
+use Traversable;
 
 /**
  * Offers a handful of method to manipulate iterators
@@ -164,7 +165,7 @@ public function extract($matcher)
         if (is_string($matcher) && strpos($matcher, '{*}') !== false) {
             $extractor = $extractor
                 ->filter(function ($data) {
-                    return $data !== null && ($data instanceof \Traversable || is_array($data));
+                    return $data !== null && ($data instanceof Traversable || is_array($data));
                 })
                 ->unfold();
         }

src/Collection/ExtractTrait.php

@@ -13,6 +13,7 @@
  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
  */
 namespace Cake\Collection;
+use Traversable;
 
 /**
  * Provides utility protected methods for extracting a property or column
@@ -70,7 +71,7 @@ protected function _extract($data, $path)
             }
 
             if ($collectionTransform &&
-                !($data instanceof \Traversable || is_array($data))) {
+                !($data instanceof Traversable || is_array($data))) {
                 return null;
             }
 

src/Collection/Iterator/MapReduce.php

@@ -15,6 +15,8 @@
 
 use ArrayIterator;
 use IteratorAggregate;
+use LogicException;
+use Traversable;
 
 /**
  * Implements a simplistic version of the popular Map-Reduce algorithm. Acts
@@ -111,7 +113,7 @@ class MapReduce implements IteratorAggregate
      * of the bucket that was created during the mapping phase and third one is an
      * instance of this class.
      */
-    public function __construct(\Traversable $data, callable $mapper, callable $reducer = null)
+    public function __construct(Traversable $data, callable $mapper, callable $reducer = null)
     {
         $this->_data = $data;
         $this->_mapper = $mapper;
@@ -177,7 +179,7 @@ protected function _execute()
         $this->_data = null;
 
         if (!empty($this->_intermediate) && empty($this->_reducer)) {
-            throw new \LogicException('No reducer function was provided');
+            throw new LogicException('No reducer function was provided');
         }
 
         $reducer = $this->_reducer;

src/Collection/Iterator/NestIterator.php

@@ -16,6 +16,7 @@
 
 use Cake\Collection\Collection;
 use RecursiveIterator;
+use Traversable;
 
 /**
  * A type of collection that is aware of nested items and exposes methods to
@@ -71,6 +72,6 @@ public function hasChildren()
             return !empty($children);
         }
 
-        return $children instanceof \Traversable;
+        return $children instanceof Traversable;
     }
 }

src/Collection/Iterator/SortIterator.php

@@ -15,6 +15,7 @@
 namespace Cake\Collection\Iterator;
 
 use Cake\Collection\Collection;
+use DateTime;
 
 /**
  * An iterator that will return the passed items in order. The order is given by
@@ -67,7 +68,7 @@ public function __construct($items, $callback, $dir = SORT_DESC, $type = SORT_NU
         $results = [];
         foreach ($items as $key => $value) {
             $value = $callback($value);
-            if ($value instanceof \DateTime && $type === SORT_NUMERIC) {
+            if ($value instanceof DateTime && $type === SORT_NUMERIC) {
                 $value = $value->format('U');
             }
             $results[$key] = $value;

src/Console/ConsoleInputArgument.php

@@ -15,6 +15,7 @@
 namespace Cake\Console;
 
 use Cake\Console\Exception\ConsoleException;
+use SimpleXmlElement;
 
 /**
  * An object to represent a single argument used in the command line.
@@ -177,7 +178,7 @@ public function validChoice($value)
      * @param \SimpleXmlElement $parent The parent element.
      * @return \SimpleXmlElement The parent with this argument appended.
      */
-    public function xml(\SimpleXmlElement $parent)
+    public function xml(SimpleXmlElement $parent)
     {
         $option = $parent->addChild('argument');
         $option->addAttribute('name', $this->_name);

src/Console/ConsoleInputOption.php

@@ -15,6 +15,7 @@
 namespace Cake\Console;
 
 use Cake\Console\Exception\ConsoleException;
+use SimpleXmlElement;
 
 /**
  * An object to represent a single option used in the command line.
@@ -213,7 +214,7 @@ public function validChoice($value)
      * @param \SimpleXmlElement $parent The parent element.
      * @return \SimpleXmlElement The parent with this option appended.
      */
-    public function xml(\SimpleXmlElement $parent)
+    public function xml(SimpleXmlElement $parent)
     {
         $option = $parent->addChild('option');
         $option->addAttribute('name', '--' . $this->_name);

src/Console/ConsoleInputSubcommand.php

@@ -15,6 +15,7 @@
  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
  */
 namespace Cake\Console;
+use SimpleXmlElement;
 
 /**
  * An object to represent a single subcommand used in the command line.
@@ -115,7 +116,7 @@ public function parser()
      * @param \SimpleXmlElement $parent The parent element.
      * @return \SimpleXmlElement The parent with this subcommand appended.
      */
-    public function xml(\SimpleXmlElement $parent)
+    public function xml(SimpleXmlElement $parent)
     {
         $command = $parent->addChild('command');
         $command->addAttribute('name', $this->_name);

src/Console/HelpFormatter.php

@@ -15,6 +15,7 @@
 namespace Cake\Console;
 
 use Cake\Utility\Text;
+use SimpleXmlElement;
 
 /**
  * HelpFormatter formats help for console shells. Can format to either
@@ -188,7 +189,7 @@ protected function _getMaxLength($collection)
     public function xml($string = true)
     {
         $parser = $this->_parser;
-        $xml = new \SimpleXmlElement('<shell></shell>');
+        $xml = new SimpleXmlElement('<shell></shell>');
         $xml->addChild('command', $parser->command());
         $xml->addChild('description', $parser->description());
 

src/Console/Shell.php

@@ -24,6 +24,8 @@
 use Cake\Utility\Inflector;
 use Cake\Utility\MergeVariablesTrait;
 use Cake\Utility\Text;
+use ReflectionException;
+use ReflectionMethod;
 
 /**
  * Base class for command-line utilities for automating programmer chores.
@@ -271,12 +273,12 @@ public function hasTask($task)
     public function hasMethod($name)
     {
         try {
-            $method = new \ReflectionMethod($this, $name);
+            $method = new ReflectionMethod($this, $name);
             if (!$method->isPublic()) {
                 return false;
             }
             return $method->getDeclaringClass()->name !== 'Cake\Console\Shell';
-        } catch (\ReflectionException $e) {
+        } catch (ReflectionException $e) {
             return false;
         }
     }

src/Controller/Component/FlashComponent.php

@@ -18,6 +18,7 @@
 use Cake\Controller\ComponentRegistry;
 use Cake\Network\Exception\InternalErrorException;
 use Cake\Utility\Inflector;
+use Exception;
 
 /**
  * The CakePHP FlashComponent provides a way for you to write a flash variable
@@ -82,7 +83,7 @@ public function set($message, array $options = [])
     {
         $options += $this->config();
 
-        if ($message instanceof \Exception) {
+        if ($message instanceof Exception) {
             $options['params'] += ['code' => $message->getCode()];
             $message = $message->getMessage();
         }

src/Database/Connection.php

@@ -24,6 +24,7 @@
 use Cake\Database\Schema\Collection as SchemaCollection;
 use Cake\Database\ValueBinder;
 use Cake\Datasource\ConnectionInterface;
+use Exception;
 
 /**
  * Represents a connection with a database server.
@@ -180,7 +181,7 @@ public function connect()
         try {
             $this->_driver->connect();
             return true;
-        } catch (\Exception $e) {
+        } catch (Exception $e) {
             throw new MissingConnectionException(['reason' => $e->getMessage()]);
         }
     }
@@ -544,7 +545,7 @@ public function transactional(callable $callback)
 
         try {
             $result = $callback($this);
-        } catch (\Exception $e) {
+        } catch (Exception $e) {
             $this->rollback();
             throw $e;
         }
@@ -575,7 +576,7 @@ public function disableConstraints(callable $callback)
 
         try {
             $result = $callback($this);
-        } catch (\Exception $e) {
+        } catch (Exception $e) {
             $this->enableForeignKeys();
             throw $e;
         }

src/Database/Dialect/MysqlDialectTrait.php

@@ -14,6 +14,7 @@
  */
 namespace Cake\Database\Dialect;
 
+use Cake\Database\Schema\MysqlSchema;
 use Cake\Database\SqlDialectTrait;
 
 /**
@@ -59,7 +60,7 @@ trait MysqlDialectTrait
     public function schemaDialect()
     {
         if (!$this->_schemaDialect) {
-            $this->_schemaDialect = new \Cake\Database\Schema\MysqlSchema($this);
+            $this->_schemaDialect = new MysqlSchema($this);
         }
         return $this->_schemaDialect;
     }

src/Database/Dialect/PostgresDialectTrait.php

@@ -15,6 +15,7 @@
 namespace Cake\Database\Dialect;
 
 use Cake\Database\Expression\FunctionExpression;
+use Cake\Database\Schema\PostgresSchema;
 use Cake\Database\SqlDialectTrait;
 
 /**
@@ -161,7 +162,7 @@ protected function _transformFunctionExpression(FunctionExpression $expression)
     public function schemaDialect()
     {
         if (!$this->_schemaDialect) {
-            $this->_schemaDialect = new \Cake\Database\Schema\PostgresSchema($this);
+            $this->_schemaDialect = new PostgresSchema($this);
         }
         return $this->_schemaDialect;
     }

src/Database/Dialect/SqliteDialectTrait.php

@@ -16,6 +16,7 @@
 
 use Cake\Database\ExpressionInterface;
 use Cake\Database\Expression\FunctionExpression;
+use Cake\Database\Schema\SqliteSchema;
 use Cake\Database\SqlDialectTrait;
 use Cake\Database\SqliteCompiler;
 
@@ -212,7 +213,7 @@ protected function _insertQueryTranslator($query)
     public function schemaDialect()
     {
         if (!$this->_schemaDialect) {
-            $this->_schemaDialect = new \Cake\Database\Schema\SqliteSchema($this);
+            $this->_schemaDialect = new SqliteSchema($this);
         }
         return $this->_schemaDialect;
     }

src/Database/Dialect/SqlserverDialectTrait.php

@@ -18,6 +18,7 @@
 use Cake\Database\Expression\OrderByExpression;
 use Cake\Database\Expression\UnaryExpression;
 use Cake\Database\Query;
+use Cake\Database\Schema\SqlserverSchema;
 use Cake\Database\SqlDialectTrait;
 use Cake\Database\SqlserverCompiler;
 use PDO;
@@ -281,7 +282,7 @@ protected function _transformFunctionExpression(FunctionExpression $expression)
      */
     public function schemaDialect()
     {
-        return new \Cake\Database\Schema\SqlserverSchema($this);
+        return new SqlserverSchema($this);
     }
 
     /**