What is the purpose of using mysql_error() in PHP when executing SQL queries?

When executing SQL queries in PHP, using mysql_error() can help in debugging by providing detailed error messages if the query fails to execute properly. This function can help identify issues such as syntax errors, connection problems, or permission errors, allowing developers to quickly troubleshoot and resolve the problem. 

$query = "SELECT * FROM users";
$result = mysqli_query($connection, $query);

if (!$result) {
    die('Error: ' . mysqli_error($connection));
}

Keywords

mysql_error PHP SQL queries error handling debugging

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