Using Isset() function in php

| By Webner

The Isset () Function:

The isset () function is used when we have to check whether a value in the variable is set or not. It returns false when variable contains null values.

For Example, values are stored in a session so that it can have access to another web page.


$_SESSION["userid"] = "1001";
$_SESSION["flag"] = "true";


Now we check whether the session values are set or not:

if(isset($_SESSION["userid"] )and $_SESSION["flag"] == "true")
echo ”userid”.$_SESSION["userid"];
echo ”flag”.$_SESSION["flag"];

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