我正在尝试获取“wp\u\u sessions”db表中“session\u value”列下所有会话的所有值。
下面的代码完成了这项工作，但由于某种原因，它将结果复制了6次，从而得到了6个具有完全相同内容的数组。

global $wpdb;
$wooSessions = $wpdb->get_col( "SELECT session_value FROM {$wpdb->prefix}woocommerce_sessions" );
$wooCookies = implode(" ", $wooSessions);

我正在阅读文档中关于object_k的内容，理论上它会丢弃重复的键，但我不知道如何应用它。如果我在getcol括号中添加object，代码将停止工作。
这是输出变量转储（$woosessions）；给了我：

array(1) { [0]=> string(4366) "a:12:{s:4:"cart";s:2084:"a:2:{s:32:"1b4cfd194c804d1ad422a350aa2a0145…"}

array(1) { [0]=> string(4366) "a:12:{s:4:"cart";s:2084:"a:2:{s:32:"1b4cfd194c804d1ad422a350aa2a0145…"}

array(1) { [0]=> string(4366) "a:12:{s:4:"cart";s:2084:"a:2:{s:32:"1b4cfd194c804d1ad422a350aa2a0145…"}

array(1) { [0]=> string(4366) "a:12:{s:4:"cart";s:2084:"a:2:{s:32:"1b4cfd194c804d1ad422a350aa2a0145…"}

array(1) { [0]=> string(4366) "a:12:{s:4:"cart";s:2084:"a:2:{s:32:"1b4cfd194c804d1ad422a350aa2a0145…"}

array(1) { [0]=> string(4366) "a:12:{s:4:"cart";s:2084:"a:2:{s:32:"1b4cfd194c804d1ad422a350aa2a0145…"}

下面是使用session\u id和session\u key的另一个示例：

global $wpdb;
$wooSessions = $wpdb->get_results( "SELECT DISTINCT session_id, session_key FROM {$wpdb->prefix}woocommerce_sessions GROUP BY session_key" );

返回以下内容：

Array ( [0] => stdClass Object ( [session_id] => 2149 [session_key] => 76f0552cff4af84e1963815c1fc4a14d ) ) 
Array ( [0] => stdClass Object ( [session_id] => 2149 [session_key] => 76f0552cff4af84e1963815c1fc4a14d ) ) 
Array ( [0] => stdClass Object ( [session_id] => 2149 [session_key] => 76f0552cff4af84e1963815c1fc4a14d ) ) 
Array ( [0] => stdClass Object ( [session_id] => 2149 [session_key] => 76f0552cff4af84e1963815c1fc4a14d ) ) 
Array ( [0] => stdClass Object ( [session_id] => 2149 [session_key] => 76f0552cff4af84e1963815c1fc4a14d ) ) 
Array ( [0] => stdClass Object ( [session_id] => 2149 [session_key] => 76f0552cff4af84e1963815c1fc4a14d ) )

下面是选择session\u id和group by session\u id的另一个示例：

global $wpdb;
$wooSessions = $wpdb->get_results( "SELECT session_id FROM {$wpdb->prefix}woocommerce_sessions GROUP BY session_id" );

结果如下：

Array ( [0] => stdClass Object ( [session_id] => 2149 ) )
Array ( [0] => stdClass Object ( [session_id] => 2149 ) )
Array ( [0] => stdClass Object ( [session_id] => 2149 ) )
Array ( [0] => stdClass Object ( [session_id] => 2149 ) )
Array ( [0] => stdClass Object ( [session_id] => 2149 ) )
Array ( [0] => stdClass Object ( [session_id] => 2149 ) )

有什么想法能给我指明正确的方向吗？提前谢谢。