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Take a look at <a href="http://php.net/manual/en/function.session-set-cookie-params.php" rel="ugc">session_set_cookie_params(<wbr />)</a> - use it to set the default path for the session cookie (so it is valid across sub-domains)<br />

<pre><code class="code-1 nolinks" id="code-20-42086718-1"><span>&lt;?php</span>
<span>session_start()</span>
<span>session_set_cookie_params(0, '/', '.adaalo.com'); </span>
</code></pre>
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This question has gone stale - recommend a points split between <br />
<br />
<a href="https://www.experts-exchange.com/questions/29015191/Session-Related-Query.html?anchorAnswerId=42086722#a42086722" rel="ugc">https://www.experts-exchange.com/questions/29015191/Session-Related-Query.html?anchorAnswerId=42086722#a42086722</a><br />
<a href="https://www.experts-exchange.com/questions/29015191/Session-Related-Query.html?anchorAnswerId=42106912#a42106912" rel="ugc">https://www.experts-exchange.com/questions/29015191/Session-Related-Query.html?anchorAnswerId=42106912#a42106912</a>
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<div class="content wysiwyg-content">
My domain name is <a href="http://www.adaalo.com" rel="ugc">www.adaalo.com</a><br />
<br />
when i try to login with <a href="http://www.adaalo.com" rel="ugc">www.adaalo.com</a>&nbsp;its sucessfully login<br />
<br />
but when i select city its convert to <a href="http://www.bangalore.adaalo.com" rel="ugc">www.bangalore.adaalo.com</a>&nbsp;<br />
<br />
that time session automatically destory
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My domain name is www.adaalo.com

when i try to login with www.adaalo.com its sucessfully login

but when i select city its convert to www.bangalore.adaalo.com 

that time session automatically destory

Session Related Query

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.