How can PHP developers ensure proper variable handling to avoid issues like the one described in the forum thread?

Issue: PHP developers can ensure proper variable handling by always checking the existence of a variable before using it to avoid errors like undefined variable notices. One way to solve this issue is by using the isset() function to check if a variable is set before trying to access its value. Code snippet: 

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

Keywords

data validation input sanitization type coercion error reporting exception handling

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