What are the potential pitfalls of not defining default values for variables in PHP form processing?

When not defining default values for variables in PHP form processing, it can lead to errors or unexpected behavior if the form field is left blank or not set. To solve this issue, it is recommended to assign default values to the variables to ensure that they always have a value to work with. 

// Define default values for form variables
$name = isset($_POST['name']) ? $_POST['name'] : "";
$email = isset($_POST['email']) ? $_POST['email'] : "";
$message = isset($_POST['message']) ? $_POST['message'] : "";

Keywords

PHP form processing variables default values errors

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