How can error handling be improved in PHP scripts using MySQL queries to prevent errors like "supplied argument is not a valid MySQL result resource"?

The issue of "supplied argument is not a valid MySQL result resource" typically occurs when a MySQL query fails to execute properly. To prevent this error, it is essential to include error handling mechanisms in your PHP scripts when executing MySQL queries. One way to improve error handling is by checking the result of the query execution and displaying an error message if the query fails. 

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

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

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

// Check if query was successful
if (!$result) {
    die("Error executing query: " . mysqli_error($connection));
}

// Process the query result
while ($row = mysqli_fetch_assoc($result)) {
    // Process each row
}

// Close the connection
mysqli_close($connection);

Keywords

PHP MySQL error handling mysqli_query valid MySQL result resource

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