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Null session array condition not met until page is refreshed

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When I use the following code, it doesn't print out "else if test" until after I refresh the page.


if ( !empty($_SESSION["product"]) && ($_SESSION["product"] != NULL)) {
echo "if test";
} else if {
echo "else if test";

When I use:


It shows:

array(0) { } 

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The code didn't actually make the call to unset the variables until after the not empty conditional was asked. I was misled because var_dump still printed out an empty session array. Once I changed the order of my code, it worked. 

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