内核更新

core/convention.php

@@ -274,10 +274,6 @@ return [
         'datetime_format' => 'Y-m-d H:i:s',
         // 是否需要进行SQL性能分析
         'sql_explain'     => false,
-        // Builder类
-        'builder'         => '',
-        // Query类
-        'query'           => '\\think\\db\\Query',
     ],
 
     //分页配置

core/helper.php

@@ -495,15 +495,16 @@ if (!function_exists('redirect')) {
      * @param mixed         $url 重定向地址 支持Url::build方法的地址
      * @param array|integer $params 额外参数
      * @param integer       $code 状态码
+     * @param array         $with 隐式传参
      * @return \think\response\Redirect
      */
-    function redirect($url = [], $params = [], $code = 302)
+    function redirect($url = [], $params = [], $code = 302, $with = [])
     {
         if (is_integer($params)) {
             $code   = $params;
             $params = [];
         }
-        return Response::create($url, 'redirect', $code)->params($params);
+        return Response::create($url, 'redirect', $code)->params($params)->with($with);
     }
 }
 

core/library/think/Model.php

@@ -189,7 +189,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         }
         // 全局作用域
         if ($baseQuery && method_exists($this, 'base')) {
-            call_user_func_array([$this, 'base'], [& self::$links[$model]]);
+            call_user_func_array([$this, 'base'], [ & self::$links[$model]]);
         }
         // 返回当前模型的数据库查询对象
         return self::$links[$model];
@@ -328,7 +328,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         } elseif (is_string($this->autoWriteTimestamp) && in_array(strtolower($this->autoWriteTimestamp), [
             'datetime',
             'date',
-                'timestamp'
+            'timestamp',
         ])
         ) {
             $value = $this->formatDateTime($_SERVER['REQUEST_TIME'], $this->dateFormat);
@@ -350,7 +350,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
     {
         if (false !== strpos($format, '\\')) {
             $time = new $format($time);
-        } elseif (!$timestamp) {
+        } elseif (!$timestamp && false !== $format) {
             $time = date($format, $time);
         }
         return $time;
@@ -441,7 +441,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
             if (is_string($this->autoWriteTimestamp) && in_array(strtolower($this->autoWriteTimestamp), [
                 'datetime',
                 'date',
-                    'timestamp'
+                'timestamp',
             ])
             ) {
                 $value = $this->formatDateTime(strtotime($value), $this->dateFormat);
@@ -1018,6 +1018,21 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         return $this;
     }
 
+    /**
+     * 设置只读字段
+     * @access public
+     * @param mixed $field 只读字段
+     * @return $this
+     */
+    public function readonly($field)
+    {
+        if (is_string($field)) {
+            $field = explode(',', $field);
+        }
+        $this->readonly = $field;
+        return $this;
+    }
+
     /**
      * 是否为更新数据
      * @access public
@@ -1219,7 +1234,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         if (isset(self::$event[$this->class][$event])) {
             foreach (self::$event[$this->class][$event] as $callback) {
                 if (is_callable($callback)) {
-                    $result = call_user_func_array($callback, [& $params]);
+                    $result = call_user_func_array($callback, [ & $params]);
                     if (false === $result) {
                         return false;
                     }
@@ -1275,6 +1290,10 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      */
     public static function get($data = null, $with = [], $cache = false)
     {
+        if (true === $with || is_int($with)) {
+            $cache = $with;
+            $with  = [];
+        }
         $query = static::parseQuery($data, $with, $cache);
         return $query->find($data);
     }
@@ -1290,6 +1309,10 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      */
     public static function all($data = null, $with = [], $cache = false)
     {
+        if (true === $with || is_int($with)) {
+            $cache = $with;
+            $with  = [];
+        }
         $query = static::parseQuery($data, $with, $cache);
         return $query->select($data);
     }
@@ -1309,7 +1332,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
             $result = $result->where($data);
             $data   = null;
         } elseif ($data instanceof \Closure) {
-            call_user_func_array($data, [& $result]);
+            call_user_func_array($data, [ & $result]);
             $data = null;
         } elseif ($data instanceof Query) {
             $result = $data->with($with)->cache($cache);
@@ -1332,7 +1355,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
             $query->where($data);
             $data = null;
         } elseif ($data instanceof \Closure) {
-            call_user_func_array($data, [& $query]);
+            call_user_func_array($data, [ & $query]);
             $data = null;
         } elseif (is_null($data)) {
             return 0;

core/library/think/Url.php

@@ -153,7 +153,8 @@ class Url
         // 检测域名
         $domain = self::parseDomain($url, $domain);
         // URL组装
-        $url             = $domain . (self::$root ?: Request::instance()->root()) . '/' . ltrim($url, '/');
+        $url = $domain . rtrim(self::$root ?: Request::instance()->root(), '/') . '/' . ltrim($url, '/');
+
         self::$bindCheck = false;
         return $url;
     }

core/library/think/Validate.php

@@ -656,7 +656,7 @@ class Validate
         if (!in_array($rule, ['ipv4', 'ipv6'])) {
             $rule = 'ipv4';
         }
-        return $this->filter($value, FILTER_VALIDATE_IP, 'ipv6' == $rule ? FILTER_FLAG_IPV6 : FILTER_FLAG_IPV4);
+        return $this->filter($value, [FILTER_VALIDATE_IP, 'ipv6' == $rule ? FILTER_FLAG_IPV6 : FILTER_FLAG_IPV4]);
     }
 
     /**
@@ -872,6 +872,7 @@ class Validate
             list($rule, $param) = explode(',', $rule);
         } elseif (is_array($rule)) {
             $param = isset($rule[1]) ? $rule[1] : null;
+            $rule  = $rule[0];
         } else {
             $param = null;
         }

core/library/think/db/Builder.php

@@ -250,7 +250,10 @@ abstract class Builder
                     // 使用闭包查询
                     $query = new Query($this->connection);
                     call_user_func_array($value, [ & $query]);
-                    $str[] = ' ' . $key . ' ( ' . $this->buildWhere($query->getOptions('where'), $options) . ' )';
+                    $whereClause = $this->buildWhere($query->getOptions('where'), $options);
+                    if (!empty($whereClause)) {
+                        $str[] = ' ' . $key . ' ( ' . $whereClause . ' )';
+                    }
                 } elseif (strpos($field, '|')) {
                     // 不同字段使用相同查询条件（OR）
                     $array = explode('|', $field);

core/library/think/db/Connection.php

@@ -108,6 +108,8 @@ abstract class Connection
         'builder'         => '',
         // Query类
         'query'           => '\\think\\db\\Query',
+        // 是否需要断线重连
+        'break_reconnect' => false,
     ];
 
     // PDO连接参数
@@ -391,6 +393,9 @@ abstract class Connection
             // 返回结果集
             return $this->getResult($pdo, $procedure);
         } catch (\PDOException $e) {
+            if ($this->config['break_reconnect'] && $this->isBreak($e)) {
+                return $this->close()->query($sql, $bind, $master, $pdo);
+            }
             throw new PDOException($e, $this->config, $this->getLastsql());
         }
     }
@@ -446,6 +451,9 @@ abstract class Connection
             $this->numRows = $this->PDOStatement->rowCount();
             return $this->numRows;
         } catch (\PDOException $e) {
+            if ($this->config['break_reconnect'] && $this->isBreak($e)) {
+                return $this->close()->execute($sql, $bind);
+            }
             throw new PDOException($e, $this->config, $this->getLastsql());
         }
     }
@@ -747,8 +755,9 @@ abstract class Connection
     }
 
     /**
-     * 关闭数据库
+     * 关闭数据库（或者重新连接）
      * @access public
+     * @return $this
      */
     public function close()
     {
@@ -756,6 +765,18 @@ abstract class Connection
         $this->linkWrite = null;
         $this->linkRead  = null;
         $this->links     = [];
+        return $this;
+    }
+
+    /**
+     * 是否断线
+     * @access protected
+     * @param \PDOException  $e 异常
+     * @return bool
+     */
+    protected function isBreak($e)
+    {
+        return false;
     }
 
     /**

core/library/think/db/Query.php

@@ -419,11 +419,7 @@ class Query
             }
             if (isset($cache)) {
                 // 缓存数据
-                if (isset($cache['tag'])) {
+                $this->cacheData($key, $result, $cache);
-                    Cache::tag($cache['tag'])->set($key, $result, $cache['expire']);
-                } else {
-                    Cache::set($key, $result, $cache['expire']);
-                }
             }
         } else {
             // 清空查询条件
@@ -491,11 +487,7 @@ class Query
             }
             if (isset($cache) && isset($guid)) {
                 // 缓存数据
-                if (isset($cache['tag'])) {
+                $this->cacheData($guid, $result, $cache);
-                    Cache::tag($cache['tag'])->set($guid, $result, $cache['expire']);
-                } else {
-                    Cache::set($guid, $result, $cache['expire']);
-                }
             }
         } else {
             // 清空查询条件
@@ -2070,11 +2062,18 @@ class Query
         // 执行操作
         $result = $this->execute($sql, $bind);
         if ($result) {
-            $this->trigger('after_insert', $options);
-        }
-        if ($getLastInsID) {
             $sequence  = $sequence ?: (isset($options['sequence']) ? $options['sequence'] : null);
-            return $this->getLastInsID($sequence);
+            $lastInsId = $this->getLastInsID($sequence);
+            if ($lastInsId) {
+                $pk        = $this->getPk($options);
+                $data[$pk] = $lastInsId;
+            }
+            $options['data'] = $data;
+            $this->trigger('after_insert', $options);
+
+            if ($getLastInsID) {
+                return $lastInsId;
+            }
         }
         return $result;
     }
@@ -2157,8 +2156,8 @@ class Query
         $options = $this->parseExpress();
         $data    = array_merge($options['data'], $data);
         $pk      = $this->getPk($options);
-        if (isset($options['cache']) && is_string($options['cache'])) {
+        if (isset($options['cache']) && is_string($options['cache']['key'])) {
-            $key = $options['cache'];
+            $key = $options['cache']['key'];
         }
 
         if (empty($options['where'])) {
@@ -2187,9 +2186,10 @@ class Query
             } else {
                 $options['where']['AND'] = $where;
             }
-        } elseif (is_string($pk) && isset($options['where']['AND'][$pk]) && is_scalar($options['where']['AND'][$pk])) {
+        } elseif (!isset($key) && is_string($pk) && isset($options['where']['AND'][$pk])) {
-            $key = 'think:' . $options['table'] . '|' . $options['where']['AND'][$pk];
+            $key = $this->getCacheKey($options['where']['AND'][$pk], $options);
         }
+
         // 生成UPDATE SQL语句
         $sql = $this->builder->update($data, $options);
         // 获取参数绑定
@@ -2206,6 +2206,13 @@ class Query
             // 执行操作
             $result = '' == $sql ? 0 : $this->execute($sql, $bind);
             if ($result) {
+                if (isset($where[$pk])) {
+                    $data[$pk] = $where[$pk];
+                } elseif (is_string($pk) && isset($key) && strpos($key, '|')) {
+                    list($a, $val) = explode('|', $key);
+                    $data[$pk]     = $val;
+                }
+                $options['data'] = $data;
                 $this->trigger('after_update', $options);
             }
             return $result;
@@ -2278,6 +2285,8 @@ class Query
                 // 获取实际执行的SQL语句
                 return $this->connection->getRealSql($sql, $bind);
             }
+
+            $options['data'] = $data;
             if ($resultSet = $this->trigger('before_select', $options)) {
             } else {
                 // 执行查询操作
@@ -2291,11 +2300,7 @@ class Query
 
             if (isset($cache)) {
                 // 缓存数据集
-                if (isset($cache['tag'])) {
+                $this->cacheData($key, $resultSet, $cache);
-                    Cache::tag($cache['tag'])->set($key, $resultSet, $cache['expire']);
-                } else {
-                    Cache::set($key, $resultSet, $cache['expire']);
-                }
             }
         }
 
@@ -2339,6 +2344,40 @@ class Query
         return $resultSet;
     }
 
+    /**
+     * 缓存数据
+     * @access public
+     * @param string    $key    缓存标识
+     * @param mixed     $data   缓存数据
+     * @param array     $config 缓存参数
+     */
+    protected function cacheData($key, $data, $config = [])
+    {
+        if (isset($config['tag'])) {
+            Cache::tag($config['tag'])->set($key, $data, $config['expire']);
+        } else {
+            Cache::set($key, $data, $config['expire']);
+        }
+    }
+
+    /**
+     * 生成缓存标识
+     * @access public
+     * @param mixed     $value   缓存数据
+     * @param array     $options 缓存参数
+     */
+    protected function getCacheKey($value, $options)
+    {
+        if (is_scalar($value)) {
+            $data = $value;
+        } elseif (is_array($value) && 'eq' == strtolower($value[0])) {
+            $data = $value[1];
+        }
+        if (isset($data)) {
+            return 'think:' . $options['table'] . '|' . $data;
+        }
+    }
+
     /**
      * 查找单条记录
      * @access public
@@ -2358,10 +2397,12 @@ class Query
         }
         // 分析查询表达式
         $options = $this->parseExpress();
-
+        $pk      = $this->getPk($options);
         if (!is_null($data)) {
             // AR模式分析主键条件
             $this->parsePkWhere($data, $options);
+        } elseif (!empty($options['cache']) && true === $options['cache']['key'] && is_string($pk) && isset($options['where']['AND'][$pk])) {
+            $key = $this->getCacheKey($options['where']['AND'][$pk], $options);
         }
 
         $options['limit'] = 1;
@@ -2371,12 +2412,12 @@ class Query
             $cache = $options['cache'];
             if (true === $cache['key'] && !is_null($data) && !is_array($data)) {
                 $key = 'think:' . (is_array($options['table']) ? key($options['table']) : $options['table']) . '|' . $data;
-            } else {
+            } elseif (!isset($key)) {
                 $key = is_string($cache['key']) ? $cache['key'] : md5(serialize($options));
             }
             $result = Cache::get($key);
         }
-        if (!$result) {
+        if (false === $result) {
             // 生成查询SQL
             $sql = $this->builder->select($options);
             // 获取参数绑定
@@ -2385,56 +2426,61 @@ class Query
                 // 获取实际执行的SQL语句
                 return $this->connection->getRealSql($sql, $bind);
             }
-
+            if (is_string($pk)) {
+                if (!is_array($data)) {
+                    if (isset($key) && strpos($key, '|')) {
+                        list($a, $val) = explode('|', $key);
+                        $item[$pk]     = $val;
+                    } else {
+                        $item[$pk] = $data;
+                    }
+                    $data = $item;
+                }
+            }
+            $options['data'] = $data;
             // 事件回调
             if ($result = $this->trigger('before_find', $options)) {
             } else {
                 // 执行查询
-                $result = $this->query($sql, $bind, $options['master'], $options['fetch_pdo']);
+                $resultSet = $this->query($sql, $bind, $options['master'], $options['fetch_pdo']);
 
-                if ($result instanceof \PDOStatement) {
+                if ($resultSet instanceof \PDOStatement) {
                     // 返回PDOStatement对象
-                    return $result;
+                    return $resultSet;
                 }
+                $result = isset($resultSet[0]) ? $resultSet[0] : null;
             }
 
             if (isset($cache)) {
                 // 缓存数据
-                if (isset($cache['tag'])) {
+                $this->cacheData($key, $result, $cache);
-                    Cache::tag($cache['tag'])->set($key, $result, $cache['expire']);
-                } else {
-                    Cache::set($key, $result, $cache['expire']);
-                }
             }
         }
 
         // 数据处理
-        if (!empty($result[0])) {
+        if (!empty($result)) {
-            $data = $result[0];
             if (!empty($this->model)) {
                 // 返回模型对象
                 $model  = $this->model;
-                $data  = new $model($data);
+                $result = new $model($result);
-                $data->isUpdate(true, isset($options['where']['AND']) ? $options['where']['AND'] : null);
+                $result->isUpdate(true, isset($options['where']['AND']) ? $options['where']['AND'] : null);
                 // 关联查询
                 if (!empty($options['relation'])) {
-                    $data->relationQuery($options['relation']);
+                    $result->relationQuery($options['relation']);
                 }
                 // 预载入查询
                 if (!empty($options['with'])) {
-                    $data->eagerlyResult($data, $options['with']);
+                    $result->eagerlyResult($result, $options['with']);
                 }
                 // 关联统计
                 if (!empty($options['with_count'])) {
-                    $data->relationCount($data, $options['with_count']);
+                    $result->relationCount($result, $options['with_count']);
                 }
             }
         } elseif (!empty($options['fail'])) {
             $this->throwNotFound($options);
-        } else {
-            $data = null;
         }
-        return $data;
+        return $result;
     }
 
     /**
@@ -2565,8 +2611,9 @@ class Query
     {
         // 分析查询表达式
         $options = $this->parseExpress();
-        if (isset($options['cache']) && is_string($options['cache'])) {
+        $pk      = $this->getPk($options);
-            $key = $options['cache'];
+        if (isset($options['cache']) && is_string($options['cache']['key'])) {
+            $key = $options['cache']['key'];
         }
 
         if (!is_null($data) && true !== $data) {
@@ -2576,6 +2623,8 @@ class Query
             }
             // AR模式分析主键条件
             $this->parsePkWhere($data, $options);
+        } elseif (!isset($key) && is_string($pk) && isset($options['where']['AND'][$pk])) {
+            $key = $this->getCacheKey($options['where']['AND'][$pk], $options);
         }
 
         if (true !== $data && empty($options['where'])) {
@@ -2599,6 +2648,12 @@ class Query
         // 执行操作
         $result = $this->execute($sql, $bind);
         if ($result) {
+            if (!is_array($data) && is_string($pk) && isset($key) && strpos($key, '|')) {
+                list($a, $val) = explode('|', $key);
+                $item[$pk]     = $val;
+                $data          = $item;
+            }
+            $options['data'] = $data;
             $this->trigger('after_delete', $options);
         }
         return $result;
@@ -2711,15 +2766,15 @@ class Query
      * 触发事件
      * @access protected
      * @param string $event   事件名
-     * @param mixed  $options 当前查询参数
+     * @param mixed  $params  额外参数
      * @return bool
      */
-    protected function trigger($event, $options = [])
+    protected function trigger($event, $params = [])
     {
         $result = false;
         if (isset(self::$event[$event])) {
             $callback = self::$event[$event];
-            $result   = call_user_func_array($callback, [$options, $this]);
+            $result   = call_user_func_array($callback, [$params, $this]);
         }
         return $result;
     }

core/library/think/db/connector/Mysql.php

@@ -129,4 +129,18 @@ class Mysql extends Connection
     {
         return true;
     }
+
+    /**
+     * 是否断线
+     * @access protected
+     * @param \PDOException  $e 异常对象
+     * @return bool
+     */
+    protected function isBreak($e)
+    {
+        if (false !== stripos($e->getMessage(), 'server has gone away')) {
+            return true;
+        }
+        return false;
+    }
 }

core/library/think/model/relation/BelongsToMany.php

@@ -54,7 +54,7 @@ class BelongsToMany extends Relation
         $localKey   = $this->localKey;
         $middle     = $this->middle;
         if ($closure) {
-            call_user_func_array($closure, [& $this->query]);
+            call_user_func_array($closure, [ & $this->query]);
         }
         // 关联查询
         $pk                              = $this->parent->getPk();
@@ -174,8 +174,8 @@ class BelongsToMany extends Relation
         return $this->belongsToManyQuery($this->middle, $this->foreignKey, $this->localKey, [
             'pivot.' . $this->localKey => [
                 'exp',
-                '=' . $this->parent->getTable() . '.' . $this->parent->getPk()
+                '=' . $this->parent->getTable() . '.' . $this->parent->getPk(),
-            ]
+            ],
         ])->fetchSql()->count();
     }
 
@@ -271,7 +271,7 @@ class BelongsToMany extends Relation
      * @access public
      * @param mixed $data  数据 可以使用数组、关联模型对象 或者 关联对象的主键
      * @param array $pivot 中间表额外数据
-     * @return int
+     * @return array|Pivot
      * @throws Exception
      */
     public function attach($data, $pivot = [])
@@ -301,7 +301,12 @@ class BelongsToMany extends Relation
             $ids                    = (array) $id;
             foreach ($ids as $id) {
                 $pivot[$this->foreignKey] = $id;
-                $result                   = $this->query->table($this->middle)->insert($pivot, true);
+                $this->query->table($this->middle)->insert($pivot, true);
+                $result[] = new Pivot($pivot, $this->middle);
+            }
+            if (count($result) == 1) {
+                // 返回中间表模型对象
+                $result = $result[0];
             }
             return $result;
         } else {

core/library/think/model/relation/HasMany.php

@@ -45,7 +45,7 @@ class HasMany extends Relation
     public function getRelation($subRelation = '', $closure = null)
     {
         if ($closure) {
-            call_user_func_array($closure, [& $this->query]);
+            call_user_func_array($closure, [ & $this->query]);
         }
         return $this->relation($subRelation)->select();
     }
@@ -125,7 +125,7 @@ class HasMany extends Relation
         $count    = 0;
         if (isset($result->$localKey)) {
             if ($closure) {
-                call_user_func_array($closure, [& $this->query]);
+                call_user_func_array($closure, [ & $this->query]);
             }
             $count = $this->query->where([$this->foreignKey => $result->$localKey])->count();
         }
@@ -141,14 +141,14 @@ class HasMany extends Relation
     public function getRelationCountQuery($closure)
     {
         if ($closure) {
-            call_user_func_array($closure, [& $this->query]);
+            call_user_func_array($closure, [ & $this->query]);
         }
 
         return $this->query->where([
             $this->foreignKey => [
                 'exp',
-                '=' . $this->parent->getTable() . '.' . $this->parent->getPk()
+                '=' . $this->parent->getTable() . '.' . $this->parent->getPk(),
-            ]
+            ],
         ])->fetchSql()->count();
     }
 
@@ -167,7 +167,7 @@ class HasMany extends Relation
         $foreignKey = $this->foreignKey;
         // 预载入关联查询 支持嵌套预载入
         if ($closure) {
-            call_user_func_array($closure, [& $model]);
+            call_user_func_array($closure, [ & $model]);
         }
         $list = $model->where($where)->with($subRelation)->select();
 
@@ -217,13 +217,14 @@ class HasMany extends Relation
      * @param string  $operator 比较操作符
      * @param integer $count    个数
      * @param string  $id       关联表的统计字段
+     * @param string  $joinType JOIN类型
      * @return Query
      */
-    public function has($operator = '>=', $count = 1, $id = '*')
+    public function has($operator = '>=', $count = 1, $id = '*', $joinType = 'INNER')
     {
         $table = $this->query->getTable();
         return $this->parent->db()->alias('a')
-            ->join($table . ' b', 'a.' . $this->localKey . '=b.' . $this->foreignKey, $this->joinType)
+            ->join($table . ' b', 'a.' . $this->localKey . '=b.' . $this->foreignKey, $joinType)
             ->group('b.' . $this->foreignKey)
             ->having('count(' . $id . ')' . $operator . $count);
     }

core/library/traits/controller/Jump.php

@@ -131,16 +131,17 @@ trait Jump
      * @param string         $url 跳转的URL表达式
      * @param array|integer  $params 其它URL参数
      * @param integer        $code http code
+     * @param array          $with 隐式传参
      * @return void
      */
-    protected function redirect($url, $params = [], $code = 302)
+    protected function redirect($url, $params = [], $code = 302, $with = [])
     {
         $response = new Redirect($url);
         if (is_integer($params)) {
             $code   = $params;
             $params = [];
         }
-        $response->code($code)->params($params);
+        $response->code($code)->params($params)->with($with);
         throw new HttpResponseException($response);
     }
 

core/library/traits/model/SoftDelete.php

@@ -42,7 +42,7 @@ trait SoftDelete
     {
         $model = new static();
         $field = $model->getDeleteTimeField(true);
-        return $model->db(false)->where($field, 'exp', 'is not null');
+        return $model->db(false)->whereNotNull($field);
     }
 
     /**
@@ -129,7 +129,7 @@ trait SoftDelete
     protected function base($query)
     {
         $field = $this->getDeleteTimeField(true);
-        $query->where($field, 'null');
+        $query->whereNull($field);
     }
 
     /**