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WordPress

upgrade_all()

Since
1.0.1
Source
wp-admin/includes/upgrade.php:715
Functions to be called in installation and upgrade scripts.

Description

Contains conditional checks to determine which upgrade scripts to run, based on database version and WP version being updated-to.

Compatibility

WordPress
since 1.0.1
PHP
7.4–8.6-dev
  • 6.7.10
  • 6.8.11
  • 6.9.10
  • 7.0.7
  • 7.1.3

Present in every tracked release (6.7.10 to 7.1.3), and compiles on PHP 7.4 through 8.6-dev.

Performance profile

How much work a call to upgrade_all() 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

Reads stored settings via update_option(), cached per request but not free on a cold cache.

Scaling
Scales with input

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

Instructions
13–36

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 226.

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

  • optionoption read or writeupdate_option()called directly
  • serializeserialisationmaybe_unserialize()one call below upgrade_all()
  • hookthird-party callbacksdo_action()one call below upgrade_all()
  • transienttransientdelete_transient()one call below upgrade_all()
  • cacheobject cachewp_cache_get()one call below upgrade_all()

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

What one call costs · 6 distinct outcomes

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

WhenInstructionsCalls it makes
!->next_token()13->set_bookmark(), ->next_token(), ->get_tag()
!->next_token() && !->is_tag_closer()16->set_bookmark(), ->next_token(), ->get_tag(), ->is_tag_closer()
->next_token()17->set_bookmark(), ->next_token(), ->get_token_name(), ->get_tag()
->next_token() && !->is_tag_closer()20->set_bookmark(), ->next_token(), ->get_token_name(), ->get_tag(), ->is_tag_closer()
!->next_token() && ->is_tag_closer()32->set_bookmark(), ->next_token(), ->get_tag(), ->is_tag_closer(), ->set_bookmark()
->next_token() && ->is_tag_closer()36->set_bookmark(), ->next_token(), ->get_token_name(), ->get_tag(), ->is_tag_closer(), ->set_bookmark()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 226 instructions, 13–36 executed per call, 44 branches. The work does not change between versions.

An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.

Uses · 45

Show all 45

Used by · 1

Source code

View on Trac View on GitHub 

function upgrade_all() {	global $wp_current_db_version, $wp_db_version; 	$wp_current_db_version = (int) __get_option( 'db_version' ); 	// We are up to date. Nothing to do.	if ( $wp_db_version === $wp_current_db_version ) {		return;	} 	// If the version is not set in the DB, try to guess the version.	if ( empty( $wp_current_db_version ) ) {		$wp_current_db_version = 0; 		// If the template option exists, we have 1.5.		$template = __get_option( 'template' );		if ( ! empty( $template ) ) {			$wp_current_db_version = 2541;		}	} 	if ( $wp_current_db_version < 6039 ) {		upgrade_230_options_table();	} 	populate_options(); 	if ( $wp_current_db_version < 2541 ) {		upgrade_100();		upgrade_101();		upgrade_110();		upgrade_130();	} 	if ( $wp_current_db_version < 3308 ) {		upgrade_160();	} 	if ( $wp_current_db_version < 4772 ) {		upgrade_210();	} 	if ( $wp_current_db_version < 4351 ) {		upgrade_old_slugs();	} 	if ( $wp_current_db_version < 5539 ) {		upgrade_230();	} 	if ( $wp_current_db_version < 6124 ) {		upgrade_230_old_tables();	} 	if ( $wp_current_db_version < 7499 ) {		upgrade_250();	} 	if ( $wp_current_db_version < 7935 ) {		upgrade_252();	} 	if ( $wp_current_db_version < 8201 ) {		upgrade_260();	} 	if ( $wp_current_db_version < 8989 ) {		upgrade_270();	} 	if ( $wp_current_db_version < 10360 ) {		upgrade_280();	} 	if ( $wp_current_db_version < 11958 ) {		upgrade_290();	} 	if ( $wp_current_db_version < 15260 ) {		upgrade_300();

Changelog

Introduced in 1.0.1. Unchanged from 6.7.10 through 7.1.3.

  1. 6.7.10
  2. 6.8.11
  3. 6.9.10
  4. 7.0.7
  5. 7.1.3

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

About this page

Parsed data
Generated from the wordpress-develop 6.9.10 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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