去掉缓存驱动的length参数

library/think/cache/driver/Apc.php

@@ -23,7 +23,6 @@ class Apc
     protected $options = [
         'expire' => 0,
         'prefix' => '',
-        'length' => 0,
     ];
     /*****************************
     需要支持apc_cli模式

library/think/cache/driver/File.php

@@ -25,7 +25,6 @@ class File
         'cache_subdir'  => false,
         'path_level'    => 1,
         'prefix'        => '',
-        'length'        => 0,
         'path'          => CACHE_PATH,
         'data_compress' => false,
     ];

library/think/cache/driver/Memcache.php

@@ -23,7 +23,6 @@ class Memcache
         'expire'     => 0,
         'timeout'    => 0, // 超时时间（单位：毫秒）
         'persistent' => true,
-        'length'     => 0,
         'prefix'     => '',
     ];
 

library/think/cache/driver/Memcached.php

@@ -22,7 +22,6 @@ class Memcached
         'port'    => 11211,
         'expire'  => 0,
         'timeout' => 0, // 超时时间（单位：毫秒）
-        'length'  => 0,
         'prefix'  => '',
     ];
 

library/think/cache/driver/Redis.php

@@ -31,7 +31,6 @@ class Redis
         'timeout'    => 0,
         'expire'     => 0,
         'persistent' => false,
-        'length'     => 0,
         'prefix'     => '',
     ];
 

library/think/cache/driver/Redisd.php

@@ -70,7 +70,6 @@ class Redisd
         'timeout'    => 10,
         'expire'     => false,
         'persistent' => false,
-        'length'     => 0,
         'prefix'     => '',
         'serialize'  => \Redis::SERIALIZER_PHP,
     ];
@@ -136,7 +135,7 @@ class Redisd
         //发生错误则摘掉当前节点
         try {
             $result = $this->handler->$func($host, $port, $this->options['timeout']);
-            if($result === false) {
+            if (false === $result) {
                 $this->handler->getLastError();
             }
 

library/think/cache/driver/Sae.php

@@ -27,7 +27,6 @@ class Sae
         'expire'     => 0,
         'timeout'    => false,
         'persistent' => false,
-        'length'     => 0,
         'prefix'     => '',
     ];
 

library/think/cache/driver/Secache.php

@@ -25,7 +25,6 @@ class Secache
         'path'    => '',
         'expire'  => 0,
         'prefix'  => '',
-        'length'  => 0,
     ];
 
     /**

library/think/cache/driver/Sqlite.php

@@ -26,7 +26,6 @@ class Sqlite implements CacheInterface
         'table'      => 'sharedmemory',
         'prefix'     => '',
         'expire'     => 0,
-        'length'     => 0,
         'persistent' => false,
     ];
 

library/think/cache/driver/Wincache.php

@@ -23,7 +23,6 @@ class Wincache
     protected $options = [
         'prefix' => '',
         'expire' => 0,
-        'length' => 0,
     ];
 
     /**

library/think/cache/driver/Xcache.php

@@ -23,7 +23,6 @@ class Xcache
     protected $options = [
         'prefix' => '',
         'expire' => 0,
-        'length' => 0,
     ];
 
     /**