How can the use of mysql_error() and mysql_errno() functions help in debugging and resolving MySQL-related errors in PHP scripts?

The use of mysql_error() and mysql_errno() functions can help in debugging and resolving MySQL-related errors in PHP scripts by providing detailed error messages and error codes. These functions can be used to retrieve information about the last MySQL error that occurred, allowing developers to quickly identify the issue and take appropriate action to resolve it. 

// Connect to MySQL database
$conn = mysqli_connect("localhost", "username", "password", "database");

// Check connection
if (!$conn) {
    echo "Connection failed. Error: " . mysqli_connect_errno() . " - " . mysqli_connect_error();
    exit();
}

// Perform MySQL query
$query = "SELECT * FROM table";
$result = mysqli_query($conn, $query);

// Check for errors
if (!$result) {
    echo "Query failed. Error: " . mysqli_errno($conn) . " - " . mysqli_error($conn);
    exit();
}

// Process query results
while ($row = mysqli_fetch_assoc($result)) {
    // Do something with the data
}

// Close connection
mysqli_close($conn);

Keywords

mysql_error mysql_errno debugging MySQL PHP

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