What is the significance of the "isset" function in the context of the PHP code shared in the thread?

The "isset" function in PHP is used to determine if a variable is set and is not NULL. In the context of the shared PHP code, the isset function is being used to check if certain form input fields are set before using their values to prevent potential errors or warnings. This helps ensure that the code runs smoothly without encountering undefined variable issues. 

if(isset($_POST['submit'])) {
    $name = isset($_POST['name']) ? $_POST['name'] : '';
    $email = isset($_POST['email']) ? $_POST['email'] : '';
    
    // Rest of the code here
}

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isset function PHP code significance

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