php - Setting a global attribute to an woocommerce product -

i add globally defined attribute product in woocommerce. tried function

   update_post_meta( get_the_id(),'_product_attributes',"pa_myglobalattribute"); 

that didn't work. tried, attribute terms , assign them globalattribute:

update_post_meta( get_the_id(), 'pa_myglobalattribute',$attribute_array); 

the attribute array retrieved over:

json_decode(json_encode(get_terms("pa_myglobalattribute")),true); 

that didn't work either.

for me, important assign global attribute product, if different user edits attribute, changes assigned products.

any suggestions?

thank you!