Defining functions in the WordPress functions.php file

I  tried to define a function in my functions.php file as below:

function here ($place) { // dbgsa
	$debug = get_post_meta( $order_id, 'debug', true );
     $debug .= $place';
	update_post_meta($order_id, 'debug', $debug);
}

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The plan was then to call this from inside various action hook functions to have a record of how control passed through the code. So there might be something like:


Then if G was in the string I knew I went through that point in the code.   But this doesn't work.  here() doesn't appear to get entered.  Does anyone see the problem?

Thanks