Question

The function below will be used to input a Facebook access token into a database. The user id will already have an associated record so the “acc_tok” field just needs to be updated.

For some reason even though the $_result value holds “1” and the function echoes out “Successful!”, a warning is appearing that says:

“Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given”. Does anyone know why it appears that the query was successful but is only returning a boolean and not something the mysql_fetch_array can work with? Thanks for reading

function setUserAccessToken($_uid, $_accTok){
        $sql = "UPDATE `user_core` SET `acc_tok`=$_accTok WHERE `id` = $_uid";
        $_result = mysql_query($sql) or die($sql."<br/><br/>".mysql_error());
        echo $_result;
        if ($_result) {
        echo ("Successful!");
            $_resultArray = mysql_fetch_array($_result);
            print_r($_resultArray);
        } else {
            echo ("Failed!");
        }
}

Answer 1

You’re doing an UPDATE query, there are no rows to fetch from the result, hence a boolean value from mysql_query() and not a resource.

From the manual:

For other type of SQL statements, INSERT, UPDATE, DELETE, DROP, etc,
mysql_query() returns TRUE on success or FALSE on error.