upgrade_network()

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Performance profile

How much work a call to upgrade_network() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Heavy

Reaches the database via ->get_results().

Scaling

Scales with input

The body loops, so the work grows with how much data it finds.

Instructions

26–161

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 290.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

1

1 place in core call this, so the cost is paid more often than your own code shows.

What it touches

• optionnetwork optionget_site_option()called directly
• sqldatabase query->get_results()called directly
• hookthird-party callbacksapply_filters()one call below upgrade_network()
• cacheobject cachewp_cache_delete()one call below upgrade_network()

Further down the call graph this can also reach serialize, transient and query. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.

What one call costs · 176 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost upgrade_network() can have, taken from its control-flow graph on PHP 8.5.

This body has more branch combinations than are worth enumerating, so the table covers the outcomes found first rather than every one that exists.

Uses · 10

• delete_expired_transients()Deletes all expired transients.
• get_site_option()Retrieve an option value for the current network based on name of option.
• update_site_option()Updates the value of an option that was already added for the current network.
• delete_site_option()Removes an option by name for the current network.
• wp_get_themes()Returns an array of WP_Theme objects based on the arguments.
• wp_should_upgrade_global_tables()Determine if global tables should be upgraded.
• maybe_convert_table_to_utf8mb4()If a table only contains utf8 or utf8mb4 columns, convert it to utf8mb4.
• get_main_network_id()Gets the main network ID.
• delete_network_option()Removes a network option by name.
• is_site_meta_supported()Determines whether site meta is enabled.

Used by · 1

• wp_upgrade()Runs WordPress Upgrade functions.

Source code

View on Trac ↗View on GitHub ↗

2521function upgrade_network() {2522	global $wp_current_db_version, $wpdb;2523 2524	// Always clear expired transients.2525	delete_expired_transients( true );2526 2527	// 2.8.02528	if ( $wp_current_db_version < 11549 ) {2529		$wpmu_sitewide_plugins   = get_site_option( 'wpmu_sitewide_plugins' );2530		$active_sitewide_plugins = get_site_option( 'active_sitewide_plugins' );2531		if ( $wpmu_sitewide_plugins ) {2532			if ( ! $active_sitewide_plugins ) {2533				$sitewide_plugins = (array) $wpmu_sitewide_plugins;2534			} else {2535				$sitewide_plugins = array_merge( (array) $active_sitewide_plugins, (array) $wpmu_sitewide_plugins );2536			}2537 2538			update_site_option( 'active_sitewide_plugins', $sitewide_plugins );2539		}2540		delete_site_option( 'wpmu_sitewide_plugins' );2541		delete_site_option( 'deactivated_sitewide_plugins' );2542 2543		$start = 0;2544		while ( $rows = $wpdb->get_results( "SELECT meta_key, meta_value FROM {$wpdb->sitemeta} ORDER BY meta_id LIMIT $start, 20" ) ) {2545			foreach ( $rows as $row ) {2546				$value = $row->meta_value;2547				if ( ! @unserialize( $value ) ) {2548					$value = stripslashes( $value );2549				}2550				if ( $value !== $row->meta_value ) {2551					update_site_option( $row->meta_key, $value );2552				}2553			}2554			$start += 20;2555		}2556	}2557 2558	// 3.0.02559	if ( $wp_current_db_version < 13576 ) {2560		update_site_option( 'global_terms_enabled', '1' );2561	}2562 2563	// 3.3.02564	if ( $wp_current_db_version < 19390 ) {2565		update_site_option( 'initial_db_version', $wp_current_db_version );2566	}2567 2568	if ( $wp_current_db_version < 19470 ) {2569		if ( false === get_site_option( 'active_sitewide_plugins' ) ) {2570			update_site_option( 'active_sitewide_plugins', array() );2571		}2572	}2573 2574	// 3.4.02575	if ( $wp_current_db_version < 20148 ) {2576		// 'allowedthemes' keys things by stylesheet. 'allowed_themes' keyed things by name.2577		$allowedthemes  = get_site_option( 'allowedthemes' );2578		$allowed_themes = get_site_option( 'allowed_themes' );2579		if ( false === $allowedthemes && is_array( $allowed_themes ) && $allowed_themes ) {2580			$converted = array();2581			$themes    = wp_get_themes();2582			foreach ( $themes as $stylesheet => $theme_data ) {2583				if ( isset( $allowed_themes[ $theme_data->get( 'Name' ) ] ) ) {2584					$converted[ $stylesheet ] = true;2585				}2586			}2587			update_site_option( 'allowedthemes', $converted );2588			delete_site_option( 'allowed_themes' );2589		}2590	}2591 2592	// 3.5.02593	if ( $wp_current_db_version < 21823 ) {2594		update_site_option( 'ms_files_rewriting', '1' );2595	}2596 2597	// 3.5.22598	if ( $wp_current_db_version < 24448 ) {2599		$illegal_names = get_site_option( 'illegal_names' );2600		if ( is_array( $illegal_names ) && count( $illegal_names ) === 1 ) {

Changelog

Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 7.0.4 tag, from src/wp-admin/includes/upgrade.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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