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Add compatibility to 'Strict standards' in php 5.4.16
Ensure sku placeholder exists for variable products Closes #1734.
Check attribute values are posted.
Only empty the cart for logged in users.
Correct string to times and ranges. Closes #3540
Customer invoice does not need toggle. Closes #3459.
Pass item + id to order_line_item hook Closes #3518.
Bulk edit mark on hold Closes #3496.
fix notice with sku
Remove trashed and non-existant products from the cart. Closes #3457.
Fix syncing and make variable_product_sync static for admin use. Closes #3450
If admin user is logged in, link them to order notes. Closes #3433.
Correctly sanitize password. Closes #3553.
Notices
More login hooks Closes #3543.
Check for undefined attributes. Closes #3487.
Bulk and quick edit tax status/class. Closes #3530.
Filter woocommerce_checkout_customer_id Closes #3491
operator option. Closes #3528