What are some best practices for debugging PHP scripts that involve database interactions, especially when encountering unknown errors?

Issue: When debugging PHP scripts that involve database interactions and encountering unknown errors, it is essential to check for syntax errors, connection issues, and properly handle SQL queries and results. Fix: 

<?php
// Establish database connection
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);

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

// Execute SQL query
$sql = "SELECT * FROM table";
$result = $conn->query($sql);

// Check for errors in query execution
if (!$result) {
    die("Error in query: " . $conn->error);
}

// Fetch and display results
while ($row = $result->fetch_assoc()) {
    echo "Name: " . $row["name"] . "<br>";
}

// Close connection
$conn->close();
?>

Keywords

MySQL PDO error handling SQL injection debugging

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