WordPress does not use sessions to hold data. It is a stateless application. This means that if you want to use sessions in your plugins or custom modifications of WordPress, you may need to do a little hack to enable sessions.
Edit your wp-config.php file (located at the root of your blog) and add the following line at the beginning of the file:
session_start();
Now you can use sessions in WordPress. Remember that for most plugins, instead of using sessions to store data you can pass variables in URLs and hidden fields or use cookies, and that is what WordPress encourages.
I was going through the logs of my web server for the last month and was shocked to see that a whopping 22.93% of the total bandwidth of a particular website of mine was used by the Yahoo crawler called Slurp (I should have known better, given the revealing name).
This is just ridiculous particularly when taking into account the fact that Yahoo sends negligible number of visitors to the website.
Search Engine market share for Yahoo is coming down anyway - it is at 6.84% currently. For most of my sites Yahoo never send more than 4% of the total traffic. This means that I have to pull the plug on Yahoo! Slurp’s free run for the time being.
So how do I stop the Yahoo! crawler?
Create a file named robots.txt in the root folder of the website with the following lines of text in it:
User-Agent: Slurp
Disallow: /
User-Agent: *
Disallow:
If you don’t want to completely block the Yahoo crawler, you can just reduce the amount of requests Slurp sends to your server. To do this use the following lines in your robot.txt file:
User-agent: Slurp
Crawl-delay: 1
This “delay value” increases the time between successive Yahoo! crawler activities, and lowers the access rate of Slurp to your server. In the official FAQ you can see the details about Yahoo! Slurp and several ways to reduce the number of requests it makes to your site. For me though, supporting the Crawler is not worth the cost.
