How can the EVA principle be applied in PHP programming to avoid issues like the one described in the forum thread?

Issue: The EVA principle (Error, Validation, Action) can be applied in PHP programming to avoid issues like the one described in the forum thread by first checking for errors, then validating input, and finally performing the desired action. PHP Code Snippet: 

// Error handling
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if (empty($_POST["username"]) || empty($_POST["password"])) {
        echo "Username and password are required.";
        exit;
    }
}

// Validation
$username = $_POST["username"];
$password = $_POST["password"];

// Action
// Perform login action using $username and $password

Keywords

EVA principle PHP programming error handling exception handling debugging

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