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Note WordPress 2

Log sql query WP
https://wordpress.stackexchange.com/questions/144335/how-to-get-the-sql-of-the-changes-made-to-the-database-from-an-update-or-upgrade

Access wordpress admin panel in virtual machine. Frontpage seem ok. It's look like this when use Chrome on Windows access VirtualBox linux server:
dev.sc.com:8086/shop/
When access admin it redirect back. So there are some code, config that handle that.
Figure out oauthen, htaccess, DB ... rules that prevent this access.

This access is critical since it avoid using heavy chrome on slowly vbox.

https://stackoverflow.com/questions/36965352/woocommerce-finding-the-products-in-database
WooCommerce some data structure.

Programatic add product variants
https://stackoverflow.com/questions/23444319/wordpress-woocommerce-use-update-post-meta-to-add-product-attributes

Add_action vs do_action ?
https://stackoverflow.com/questions/32294815/wordpress-track-when-user-data-updated-hook-not-working

WC creating order programmatically
https://gist.github.com/stormwild/7f914183fc18458f6ab78e055538dcf0

Summary: add_action( 'foo' ) registers a callback, do_action( 'foo' ) executes that registered callback.
https://wordpress.stackexchange.com/questions/120339/difference-between-do-action-and-add-action

Determine product has child (variation product) or not
https://stackoverflow.com/questions/21075865/woocommerce-how-to-tell-if-product-post-has-variations-or-not

About HTTP_header
https://stackoverflow.com/questions/2297403/what-is-the-difference-between-http-host-and-server-name-in-php

https://developer.wordpress.org/reference/functions/post_exists/

WP_Query parameters
https://www.billerickson.net/code/wp_query-arguments/

Sync product and it's variation
https://stackoverflow.com/questions/24639288/woocommerce-products-showing-out-of-stock-message-when-not-actually-out-of-sto

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