How can echoing the SQL query in PHP help troubleshoot potential issues with database operations and prevent SQL injection vulnerabilities?

Echoing the SQL query in PHP can help troubleshoot potential issues with database operations by allowing developers to see exactly what query is being executed. This can help identify any syntax errors or unexpected behavior. Additionally, echoing the query can help prevent SQL injection vulnerabilities by making it easier to spot if user input is directly concatenated into the query string. 

$sql = "SELECT * FROM users WHERE username = '" . $username . "'";
echo $sql;
$result = mysqli_query($conn, $sql);

Keywords

SQL injection PHP database operations troubleshooting echoing.

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