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 ↗

2492function upgrade_network() {2493	global $wp_current_db_version, $wpdb;2494 2495	// Always clear expired transients.2496	delete_expired_transients( true );2497 2498	// 2.8.02499	if ( $wp_current_db_version < 11549 ) {2500		$wpmu_sitewide_plugins   = get_site_option( 'wpmu_sitewide_plugins' );2501		$active_sitewide_plugins = get_site_option( 'active_sitewide_plugins' );2502		if ( $wpmu_sitewide_plugins ) {2503			if ( ! $active_sitewide_plugins ) {2504				$sitewide_plugins = (array) $wpmu_sitewide_plugins;2505			} else {2506				$sitewide_plugins = array_merge( (array) $active_sitewide_plugins, (array) $wpmu_sitewide_plugins );2507			}2508 2509			update_site_option( 'active_sitewide_plugins', $sitewide_plugins );2510		}2511		delete_site_option( 'wpmu_sitewide_plugins' );2512		delete_site_option( 'deactivated_sitewide_plugins' );2513 2514		$start = 0;2515		while ( $rows = $wpdb->get_results( "SELECT meta_key, meta_value FROM {$wpdb->sitemeta} ORDER BY meta_id LIMIT $start, 20" ) ) {2516			foreach ( $rows as $row ) {2517				$value = $row->meta_value;2518				if ( ! @unserialize( $value ) ) {2519					$value = stripslashes( $value );2520				}2521				if ( $value !== $row->meta_value ) {2522					update_site_option( $row->meta_key, $value );2523				}2524			}2525			$start += 20;2526		}2527	}2528 2529	// 3.0.02530	if ( $wp_current_db_version < 13576 ) {2531		update_site_option( 'global_terms_enabled', '1' );2532	}2533 2534	// 3.3.02535	if ( $wp_current_db_version < 19390 ) {2536		update_site_option( 'initial_db_version', $wp_current_db_version );2537	}2538 2539	if ( $wp_current_db_version < 19470 ) {2540		if ( false === get_site_option( 'active_sitewide_plugins' ) ) {2541			update_site_option( 'active_sitewide_plugins', array() );2542		}2543	}2544 2545	// 3.4.02546	if ( $wp_current_db_version < 20148 ) {2547		// 'allowedthemes' keys things by stylesheet. 'allowed_themes' keyed things by name.2548		$allowedthemes  = get_site_option( 'allowedthemes' );2549		$allowed_themes = get_site_option( 'allowed_themes' );2550		if ( false === $allowedthemes && is_array( $allowed_themes ) && $allowed_themes ) {2551			$converted = array();2552			$themes    = wp_get_themes();2553			foreach ( $themes as $stylesheet => $theme_data ) {2554				if ( isset( $allowed_themes[ $theme_data->get( 'Name' ) ] ) ) {2555					$converted[ $stylesheet ] = true;2556				}2557			}2558			update_site_option( 'allowedthemes', $converted );2559			delete_site_option( 'allowed_themes' );2560		}2561	}2562 2563	// 3.5.02564	if ( $wp_current_db_version < 21823 ) {2565		update_site_option( 'ms_files_rewriting', '1' );2566	}2567 2568	// 3.5.22569	if ( $wp_current_db_version < 24448 ) {2570		$illegal_names = get_site_option( 'illegal_names' );2571		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 6.9.7 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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