Refactor: optimize multisite plugin output and reduce duplication

[kraftbj]

Summary

Manually cherry-picks the still-valid refactoring changes from closed PR #606 (which couldn't be reopened due to history divergence), adapted to the current trunk codebase.

Originally proposed by @stodorovic in #606.

Changes to plugins/multisite.php:

• Refactor the Enable/Disable cache link output in wp_super_cache_blogs_field() to use a single printf() with esc_url() and esc_html() instead of duplicated echo + wp_nonce_url() calls
• Introduce a $cache_disabled variable to eliminate the duplicated get_blog_option() call
• Use wp_create_nonce() directly in query args for cleaner, more explicit nonce handling
• Add WPCS suppression comments for $_GET accesses
• Properly sanitize the nonce value with sanitize_text_field() and wp_unslash()

See #606

Test plan

• Verify on a multisite install that the "Cached" column appears on the Network Admin > Sites page
• Verify clicking "Disable" disables caching for that site and the link changes to "Enable"
• Verify clicking "Enable" re-enables caching and the link changes back to "Disable"
• Verify the nonce check still works (manually tampering with the URL should fail)

[Copilot]

Pull request overview

This PR refactors the multisite “Cached” column action links in wp_super_cache_blogs_field() to reduce duplicated logic and make link generation/escaping more consistent, based on the still-applicable parts of closed PR #606.

Changes:

• Refactors Enable/Disable link output to a single printf() using esc_url()/esc_html().
• Avoids a duplicated get_blog_option() call by introducing $cache_disabled and deriving action/text from it.
• Adjusts nonce creation/verification and adds PHPCS suppressions around $_GET access.

Comments suppressed due to low confidence (1)

plugins/multisite.php:32

• filter_input( INPUT_GET, 'action' ) is called twice in the same block. Assign it once to a local $action variable before the conditional chain to reduce duplication and make the control flow easier to follow.

		if ( 'disable_cache' === filter_input( INPUT_GET, 'action' ) ) {
			add_blog_option( $blog_id, 'wp_super_cache_disabled', 1 );
		} elseif ( 'enable_cache' === filter_input( INPUT_GET, 'action' ) ) {
			delete_blog_option( $blog_id, 'wp_super_cache_disabled' );

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.