blocks|key|4489931|text|您遇到错误的原因是因为您没有$config['sess_save_path']|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4489932|转到you+config.php并设置|4489933|$config['sess_save_path']+=+NULL;|code-block|syntax|javascript|4489934|entityMap^0|E|P|0|6|A|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

The reason you encountered the error is because you didn't have a <code>$config['sess_save_path']</code>

Go to you <code>config.php</code> and set

<pre><code>$config['sess_save_path'] = NULL;
</code></pre>

blocks|key|4489961|text|在您的config.php+$config['sess_save_path']+=+NULL中尝试此功能|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4489962|entityMap^0|E|W|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Try this in your config.php 
 <code>$config['sess_save_path'] = NULL</code>

blocks|key|4489998|text|分享一个对我有帮助的解决方案，尝试将您的配置变量设置为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4489999|$config['sess_save_path']+=+sys_get_temp_dir();|code-block|syntax|javascript|4490000|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Sharing a solution that helped me, try set your config variable like:

<pre><code>$config['sess_save_path'] = sys_get_temp_dir();
</code></pre>

blocks|key|4491046|text|当我们在CodeIgniter中使用基于目录的会话方法时，会出现此错误。如果我们使用基于数据库的会话方法，错误将会出现。使用下面的代码-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4491047|更改应用程序->config->config.php并设置|4491048|$config['sess_driver']+=+'database';
$config['sess_cookie_name']+=+'ci_session';
$config['sess_expiration']+=+7200;
$config['sess_save_path']+=+'ci_sessions';
$config['sess_match_ip']+=+FALSE;
$config['sess_time_to_update']+=+300;
$config['sess_regenerate_destroy']+=+FALSE;|code-block|syntax|javascript|4491049|运行SQL查询(&R)|4491050|CREATE+TABLE+IF+NOT+EXISTS+`ci_sessions`+(
++++++++`id`+varchar(40)+NOT+NULL,
++++++++`ip_address`+varchar(45)+NOT+NULL,
++++++++`timestamp`+int(10)+unsigned+DEFAULT+0+NOT+NULL,
++++++++`data`+blob+NOT+NULL,
++++++++PRIMARY+KEY+(id),
++++++++KEY+`ci_sessions_timestamp`+(`timestamp`)
);|4491051|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This error comes when we use directory bases session approach in CodeIgniter. If we use database based session approach error will go. Use code below -
change your application-&gt;config-&gt;config.php and set
<pre><code>$config['sess_driver'] = 'database';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = 'ci_sessions';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;
</code></pre>
&amp; Run SQL query
<pre><code>CREATE TABLE IF NOT EXISTS `ci_sessions` (
 `id` varchar(40) NOT NULL,
 `ip_address` varchar(45) NOT NULL,
 `timestamp` int(10) unsigned DEFAULT 0 NOT NULL,
 `data` blob NOT NULL,
 PRIMARY KEY (id),
 KEY `ci_sessions_timestamp` (`timestamp`)
);
</code></pre>

blocks|key|4490087|text|在config.php中，sess_save_path应该是sys_get_temp_dir();，那么它将解决mkdir():+Invalid+path的错误|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4490088|entityMap^0|D|E|U|J|1K|L|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

In config.php <code>sess_save_path</code> should be <code>sys_get_temp_dir();</code> then it will resolve the error of <code>mkdir(): Invalid path</code>

blocks|key|4490108|text|如果$config['sess_save_path']为sys_get_temp_dir()，则会话数据将存储在系统文件夹中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4490109|如果您的数据库表为具有以下config.php的ci_sessions：|4490110|$config['sess_driver']+=+'database';+$config['sess_cookie_name']+=+'ci_session';|4490111|数据将存储在数据库中。在这种情况下，您可以使用$config['sess_save_path']+=+NULL;|4490112|entityMap^0|2|P|S|I|0|0|0|28|0|N|X|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|L|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|M|$]]

If <code>$config['sess_save_path']</code> is <code>sys_get_temp_dir()</code> then session data will store in system folder.

And If you have database table as ci_sessions with below config.php:

<code>$config['sess_driver'] = 'database';
$config['sess_cookie_name'] = 'ci_session';</code>

The data will store in database. In this case you can <code>$config['sess_save_path'] = NULL;</code>

blocks|key|4490170|text|这可能是由于PHP和codeIgniter版本的原因。对我来说，PHP+7.1.25和CI+3.0.4不起作用。您可以使用session_id()进行检查。会话已刷新。对于CI+3.1.2，它可以工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4490171|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

It can be due to PHP and codeIgniter version. 
For me, PHP 7.1.25 and CI 3.0.4 didn't work. You can check with session_id(). Session was refreshed.
With CI 3.1.2 it works.

blocks|key|4491203|text|我也遇到过类似的情况，我在godaddy中有一个多主机，首先我更正了.htacces文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4491204|<IfModule+mod_rewrite.c>
++++RewriteEngine+On
++++RewriteBase+/+

++++RewriteCond+%25{REQUEST_URI}+%5Esystem.*
++++RewriteRule+%5E(.*)$+/index.php?/$1+[L]

++++RewriteCond+%25{REQUEST_URI}+%5Eapplication.*
++++RewriteRule+%5E(.*)$+/index.php?/$1+[L]

++++RewriteCond+%25{REQUEST_FILENAME}+!-f
++++RewriteCond+%25{REQUEST_FILENAME}+!-d
++++RewriteRule+%5E(.*)$+index.php?/$1+[L]
</IfModule>

<IfModule+!mod_rewrite.c>+
++++ErrorDocument+404+/index.php
</IfModule>|code-block|syntax|javascript|4491205|然后更正文件config.php|4491206|$config['sess_driver']+=+'files';
$config['sess_cookie_name']+=+'ci_session';
$config['sess_expiration']+=+7200;
$config['sess_save_path']+=+sys_get_temp_dir();
$config['sess_match_ip']+=+FALSE;
$config['sess_time_to_update']+=+300;
$config['sess_regenerate_destroy']+=+FALSE;|4491207|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I had a similar case I have a multihost in godaddy and first I corrected the .htacces file

<pre><code>&lt;IfModule mod_rewrite.c&gt;
 RewriteEngine On
 RewriteBase / 

 RewriteCond %{REQUEST_URI} ^system.*
 RewriteRule ^(.*)$ /index.php?/$1 [L]

 RewriteCond %{REQUEST_URI} ^application.*
 RewriteRule ^(.*)$ /index.php?/$1 [L]

 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule ^(.*)$ index.php?/$1 [L]
&lt;/IfModule&gt;

&lt;IfModule !mod_rewrite.c&gt; 
 ErrorDocument 404 /index.php
&lt;/IfModule&gt;
</code></pre>

Then correct the file config.php

<pre><code>$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = sys_get_temp_dir();
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;
</code></pre>

blocks|key|4490251|text|1.在应用程序/+config.php文件夹中打开配置|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4490252|2.一直浏览到$config['sess_save_path']+=++NULL;行。|offset|length|style|CODE|4490253|3.将NULL值更改为BASEPATH.'sessions'|4490254|entityMap^0|0|7|Y|0|3|4|B|J|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@$D|Q|E|R|F|G]|$D|S|E|T|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|K|$]]

1.Open the config.php on application/config folder

2.Browse all the way down to the <code>$config['sess_save_path'] = NULL;</code> line.

3.Change the <code>NULL</code> value to <code>BASEPATH.'sessions'</code>

when I want to set session data in codeigniter 3 it says error like:

<pre><code>A PHP Error was encountered

Severity: Warning

Message: mkdir(): Invalid path

Filename: drivers/Session_files_driver.php

Line Number: 117

Backtrace:

File: C:\xampp\htdocs\ci-test\application\controllers\login.php
Line: 7
Function: __construct

File: C:\xampp\htdocs\ci-test\index.php
Line: 292
Function: require_once
</code></pre>

Here is the code that where want to set session data.

<pre><code>$sess_array = array(
 'id' =&gt; 1,
 'username' =&gt; 'bikramkc.kc@gmail.com'
 );
$this-&gt;session-&gt;set_userdata($sess_array);
</code></pre>

session error in codeigniter?

当我想在codeigniter 3中设置会话数据时，它会显示如下错误：A PHP Error was encounteredSeverity: WarningMessage: mkdir(): Invalid pathFilename: drivers/Session_files_driver.phpLine Numb...

问codeigniter中的会话错误？
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