How can debugging techniques help identify and resolve issues related to "Undefined index" errors in PHP?

When encountering "Undefined index" errors in PHP, it means that the script is trying to access an array key that doesn't exist. To resolve this issue, you can use debugging techniques such as checking if the index exists before accessing it or initializing the array key if it doesn't exist. 

// Example code snippet to prevent "Undefined index" error
if(isset($_POST['submit'])) {
    $name = isset($_POST['name']) ? $_POST['name'] : '';
    echo $name;
}

Keywords

Debugging Undefined index PHP errors Troubleshooting Error resolution

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