What is the recommended way to check if a session variable is registered in PHP 5?

To check if a session variable is registered in PHP 5, you can use the isset() function to determine if the variable is set in the $_SESSION superglobal array. This function will return true if the variable is set and false if it is not. 

// Check if a session variable is registered
if(isset($_SESSION['variable_name'])) {
    // Variable is registered
    echo "Session variable is set.";
} else {
    // Variable is not registered
    echo "Session variable is not set.";
}

Keywords

PHP 5 session variable check isset session variable registration

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