wppaste
WordPress

upgrade_280()

Since
2.8.0
Source
wp-admin/includes/upgrade.php:1655
Execute changes made in WordPress 2.8.

Compatibility

WordPress
since 2.8.0
PHP
7.4–8.6-dev
  • 6.7.7
  • 6.8.8
  • 6.9.7
  • 7.0.4
  • 7.1.0

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_280() 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
8–28

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 55.

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

  • serializeserialisationmaybe_unserialize()called directly
  • optionoption read or writeupdate_option()called directly
  • sqldatabase query->get_results()called directly
  • hookthird-party callbacksapply_filters()one call below upgrade_280()
  • cacheobject cachewp_cache_get()one call below upgrade_280()

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

What one call costs · 4 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost upgrade_280() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
!$wp_current_db_version && !is_multisite()8is_multisite()
$wp_current_db_version && !is_multisite()10populate_roles_280(), is_multisite()
!$wp_current_db_version && is_multisite()26is_multisite(), ->get_results(), get_current_blog_id(), clean_blog_cache()
$wp_current_db_version && is_multisite()28populate_roles_280(), is_multisite(), ->get_results(), get_current_blog_id(), clean_blog_cache()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 55 instructions, 8–28 executed per call, 7 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 · 6

Used by · 1

  • upgrade_all()Functions to be called in installation and upgrade scripts.

Source code

View on Trac View on GitHub 

function upgrade_280() {	global $wp_current_db_version, $wpdb; 	if ( $wp_current_db_version < 10360 ) {		populate_roles_280();	}	if ( is_multisite() ) {		$start = 0;		while ( $rows = $wpdb->get_results( "SELECT option_name, option_value FROM $wpdb->options ORDER BY option_id LIMIT $start, 20" ) ) {			foreach ( $rows as $row ) {				$value = maybe_unserialize( $row->option_value );				if ( $value === $row->option_value ) {					$value = stripslashes( $value );				}				if ( $value !== $row->option_value ) {					update_option( $row->option_name, $value );				}			}			$start += 20;		}		clean_blog_cache( get_current_blog_id() );	}}

Changelog

Introduced in 2.8.0. 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 7.1.0 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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