What role does the mysql_error function play in troubleshooting database entry issues in PHP?

The mysql_error function in PHP is used to retrieve the error message generated by the most recent MySQL function call. This can be helpful in troubleshooting database entry issues as it provides information on what went wrong during the query execution. By checking the error message returned by mysql_error, developers can identify the problem and take appropriate actions to resolve it.

// Perform a MySQL query
$result = mysql_query("SELECT * FROM users");

// Check for errors
if (!$result) {
    die("Error: " . mysql_error());
}

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

// Free the result set
mysql_free_result($result);