What best practices should be followed when migrating PHP scripts from older versions to newer versions to avoid issues like form submissions not working as expected?

When migrating PHP scripts from older versions to newer versions, it is important to ensure that any changes in syntax or functions are accounted for to avoid issues like form submissions not working as expected. One common issue is the use of the `register_globals` setting, which has been deprecated in newer versions of PHP. To fix this, you can use `$_POST` or `$_GET` superglobals to access form data instead. 

// Before migration
$username = $_POST['username'];

// After migration
$username = isset($_POST['username']) ? $_POST['username'] : '';

Keywords

PHP migration form submissions backward compatibility deprecated functions version compatibility

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