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I am creating a session variable. &nbsp;$partner_id = $_SESSION[partner]; &nbsp;I'm using it on my pages. It is set when a customer enters the site through a specific landing page. &nbsp;However, if the customer does not enter the site through that specific landing page I get an error, unknow index &quot;partner&quot;. &nbsp;How do I fix that?
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I am creating a session variable.  $partner_id = $_SESSION[partner];  I'm using it on my pages. It is set when a customer enters the site through a specific landing page.  However, if the customer does not enter the site through that specific landing page I get an error, unknow index "partner".  How do I fix that?

PHP Session Variable

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.