global variables in wordpress or woocommerce - php

Question

public function action_save_post($post_id) {
global $wpdb;
$wooqty = $_POST['qty'];
if( !empty( $wooqty ) )
update_post_meta( $post_id, 'qty', esc_attr( $wooqty ) );
}
This will save the data from a Form field in Metabox in wordpess. I would like to use this variable $wooqty which has a value to another function.
public function action_woocommerce_add_order_item_meta($item_id, $values) {
global $wpdb;
$product_no = (int) $values['product_id'];
$qty_no = (int) $values['quantity'];
}
I would like to replace the variable $qty_no data to the $wooqty. my problem is how do i pass the variable $wooqty to this function so that i can replace the values of $qty_no.

Answer 1

Seems simple enough to me. You don't need to set a global, since it is already in Wordpress post meta data. Just call get_post_meta($product_no, 'qty', TRUE); within the function.
So, your new function will look like this:
public function action_woocommerce_add_order_item_meta($item_id, $values) {
global $wpdb;
$product_no = (int) $values['product_id'];
$qty_no = get_post_meta($product_no, 'qty', TRUE);
}
Not sure why you are globalizing $wpdb, since the function doesn't do any database operations using that variable. You should be fine with removing the global $wpdb; definition at the top of your function as well.
Furthermore, I would check $item_id variable and see if that is equal to $values['product_id'], and if it is, use that instead of refetching the product id from the $values array.
Hope I helped, if not be clearer in your question. Question seems a bit old, so you probably already got this figured out by now. But just in case you haven't.

Answer 2

so you can use the following syntax to set the global from within a function and then access it elsewhere in PHP.
function foo(){
$GLOBALS['foobar'] = 'somestring';
}
function bar(){
echo $GLOBALS['foobar'];
}
foo();
bar();
However, it's not often a good idea and there may be a better way to pass the variable to the functions. How about a third function that sets the variable locally that's called from within functions 1 and 2 for instance.