What are common reasons for PHP registration form errors and how can they be resolved?

Common reasons for PHP registration form errors include incorrect form validation, missing required fields, and database connection issues. To resolve these errors, ensure that the form validation checks for all required fields, establish a successful database connection, and handle any errors that may occur during the registration process. 

<?php
// Check if form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
    // Validate form fields
    if(empty($_POST["username"]) || empty($_POST["password"])){
        echo "Please fill in all required fields.";
    } else {
        // Establish database connection
        $conn = new mysqli("localhost", "username", "password", "database");
        
        // Check for connection errors
        if($conn->connect_error){
            die("Connection failed: " . $conn->connect_error);
        }
        
        // Process registration form data
        $username = $_POST["username"];
        $password = $_POST["password"];
        
        // Insert data into database
        $sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
        if($conn->query($sql) === TRUE){
            echo "Registration successful!";
        } else {
            echo "Error: " . $sql . "<br>" . $conn->error;
        }
        
        // Close database connection
        $conn->close();
    }
}
?>

Keywords

PHP registration form errors validation troubleshooting

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