Checking Whether a Variable Is Set: isset( ) : isset « Data Type « PHP

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PHP » Data Type » isset

Checking Whether a Variable Is Set: isset( )


 

<?

    $foo = 1;

    if (isset($foo)) {

            echo "Foo is set\n";

    } else {

            echo "Foo is not set\n";

    }



    if (isset($bar)) {

            echo "Bar is set\n";

    } else {

            echo "Bar is not set\n";

    }

?>

Related examples in the same category

1.	Checking PHP's global authentication variables
2.	Using the isset() function to see whether an array element is defined for a given index.
3.	bool isset ( mixed var [, mixed var [, ...]] ) returns true if its parameter has been set
4.	Viewing the username cookie

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