What are the best practices for debugging PHP code, especially when dealing with form submissions and database queries?

Issue: When debugging PHP code related to form submissions and database queries, it is essential to use error reporting functions, such as error_reporting(E_ALL) and ini_set('display_errors', 1), to display any errors or warnings that may occur. Additionally, using var_dump() or print_r() functions can help to inspect variables and data structures to identify any issues in the code. Code snippet: 

<?php
// Enable error reporting
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Sample form submission handling
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST['name'];
    $email = $_POST['email'];

    // Sample database query
    $conn = new mysqli("localhost", "username", "password", "database");

    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }

    $sql = "INSERT INTO users (name, email) VALUES ('$name', '$email')";

    if ($conn->query($sql) === TRUE) {
        echo "New record created successfully";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }

    $conn->close();
}
?>

Keywords

Xdebug var_dump error_reporting SQL injection PDO

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