What debugging techniques can be used to troubleshoot issues with PHP queries, such as echoing statements and executing them in a database console?

To troubleshoot issues with PHP queries, one can use debugging techniques such as echoing statements to check the query being executed and running the query directly in a database console to see if there are any errors. By displaying the query before execution, you can ensure that the syntax is correct and all variables are properly inserted into the query. If there are any issues, running the query in a database console can help identify any errors or discrepancies in the query.

$query = "SELECT * FROM table WHERE column = '$value'";
echo $query; // Display the query to check for any syntax errors or variable insertion issues

// Execute the query in the database console to check for errors
$result = mysqli_query($connection, $query);
if (!$result) {
    die('Query failed: ' . mysqli_error($connection));
}