How can the use of mysql_num_rows help in debugging PHP code?

Using mysql_num_rows can help in debugging PHP code by allowing you to check the number of rows returned by a MySQL query. This can help you verify if the query is returning the expected number of results, which can indicate if there is an issue with the query itself or the data being queried. By using mysql_num_rows, you can quickly identify if there are any discrepancies in the data being retrieved and make necessary adjustments to your code. 

// Example of using mysql_num_rows to debug PHP code
$query = "SELECT * FROM users";
$result = mysql_query($query);

if (!$result) {
    die('Invalid query: ' . mysql_error());
}

$num_rows = mysql_num_rows($result);
echo "Number of rows returned: " . $num_rows;

Keywords

mysql_num_rows debugging PHP code database query results

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