How can the use of mysql_error() help in troubleshooting PHP code, especially when dealing with database operations?

Using mysql_error() can help in troubleshooting PHP code by providing detailed error messages when dealing with database operations. This function can help identify issues such as incorrect SQL queries, connection problems, or permission errors. By displaying the error message, developers can quickly pinpoint the problem and make necessary adjustments to their code. 

// Example of using mysql_error() to troubleshoot database operations
$conn = mysqli_connect("localhost", "username", "password", "database");

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

// Perform database operations
$query = "SELECT * FROM users";
$result = mysqli_query($conn, $query);

if (!$result) {
    die("Query failed: " . mysql_error());
}

// Process results
while ($row = mysqli_fetch_assoc($result)) {
    echo $row['username'] . "<br>";
}

// Close connection
mysqli_close($conn);

Keywords

mysql_error troubleshooting PHP code database operations error handling

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