What is the purpose of using the isset() function in the code snippet?

The isset() function is used in PHP to determine if a variable is set and is not NULL. In the code snippet, isset() is used to check if the $_POST['submit'] variable is set before proceeding with the form submission logic. This helps prevent errors or warnings when trying to access a variable that may not exist. 

if(isset($_POST['submit'])) {
    // Form submission logic here
    // This block will only be executed if the submit button is clicked
}

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isset function PHP code snippet purpose

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