What are the best practices for debugging PHP code that involves MySQL queries and variable assignment?

When debugging PHP code that involves MySQL queries and variable assignment, it is important to use error handling functions such as `mysqli_error()` to catch any errors in the query execution. Additionally, you can use `var_dump()` or `print_r()` to inspect the values of variables at different stages of the code to identify any issues with variable assignment. 

// Example PHP code snippet for debugging MySQL queries and variable assignment

// Connect to the database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Check connection
if (!$connection) {
    die("Connection failed: " . mysqli_connect_error());
}

// Run a sample query
$query = "SELECT * FROM users";
$result = mysqli_query($connection, $query);

// Check if query was successful
if (!$result) {
    die("Query failed: " . mysqli_error($connection));
}

// Fetch and display results
while ($row = mysqli_fetch_assoc($result)) {
    var_dump($row); // Inspect the values of the fetched row
}

// Close the connection
mysqli_close($connection);

Keywords

MySQL queries variable assignment debugging PHP functions error types

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