What is the best practice for checking if a session variable is set before starting the session in PHP?

When starting a session in PHP, it's important to check if a session variable is set to avoid potential errors. One way to do this is by using the isset() function to determine if the session variable exists before attempting to access its value. 

session_start();

if(isset($_SESSION['variable_name'])){
    // Session variable is set, do something with it
} else {
    // Session variable is not set
}

Keywords

session variable isset session_start PHP best practice

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