Commands Out of Sync; You Can't Run This Command Now

Commands out of sync; you can't run this command now

You can't have two simultaneous queries because mysqli uses unbuffered queries by default (for prepared statements; it's the opposite for vanilla mysql_query). You can either fetch the first one into an array and loop through that, or tell mysqli to buffer the queries (using $stmt->store_result()).

See here for details.

MySqli Commands out of sync; you can't run this command now

If you get Commands out of sync; you can't run this command now in your client code, you are calling client functions in the wrong order.

This can happen, for example, if you are using mysql_use_result() and try to execute a new query before you have called mysql_free_result(). It can also happen if you try to execute two queries that return data without calling mysql_use_result() or mysql_store_result() in between.

From here:
http://dev.mysql.com/doc/refman/5.0/en/commands-out-of-sync.html

Update

If you make the a variable for the query and paste the variable directly into something like MySQL Workbench you can check the syntax prior to execution.

<?php
            function myConnection(){
              $myConnection = mysqli_connect('localhost', 'my_user', 'my_password', 'my_db');
              return $myConnection;
            }   


    function register_user($register_data) { 
        array_walk($register_data, 'array_sanitize'); 
        //Make the array readable and seperate the fields from data 
        $fields = '`' . implode('`, `', array_keys($register_data)) . '`'; 
        $data = "'" . implode("', '", $register_data) . "'"; 
        //Insert the data and email an activation email to the user 
        $query = "INSERT INTO `members` ($fields) VALUES ($data)";
                    $myNewConnection = myConnection();          

                    if($result = mysqli_query($myNewConnection, $query)){ 
        email($register_data['mem_email'], 'Activate your account', "Hello " . $register_data['mem_first_name'] . ",\n\nThank you for creating an account with H Fencing. Please use the link below to activate your account so we can confirm you identity:\n\nhttp://blah.blah.co.uk/activate.php?mem_email=" . $register_data['mem_email'] . "&email_code=" . $register_data['email_code'] . "\n\n - David & Jay "); 
        mysqli_free_result($result);
         return ("Success");
        } else {
            echo $query;
            die(mysqli_error($myNewConnection));
        } 

    }

?>  

Why I am getting the Error Commands out of sync; you can't run this command now

There are result set pending from the query:

mysqli_multi_query($connection,$query);

You need to use/store result before you can proceed with next query after:
Since you look like you don't really care about the first result set, do this after the multi query..

do
{
    $result = mysqli_store_result($connection);
    mysqli_free_result($result);
}while(mysqli_next_result());

Another alternative is to close the connection and starts it again..

mysqli_close($connection);
$connection = mysqli_connect("localhost","username","password","tbl_msgs");

It all depends on your requirements.

I get: Commands out of sync; you can't run this command now?

This is what to do, if I've understood the other answer correctly:

if ($link->multi_query($sql) === TRUE) {
    // the loop below is the fix. It just cycles through the results, ignoring them
    while(mysqli_more_results($link)) {
        mysqli_next_result($link);
        // or $link->next_result();
    }

    //...

---

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