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WordPress

WP_Debug_Data::check_for_updates()

Since
5.2.0
Source
wp-admin/includes/class-wp-debug-data.php:17
Calls all core functions to check for updates.

Compatibility

WordPress
since 5.2.0
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 WP_Debug_Data::check_for_updates() 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
Expensive

Reaches an outbound HTTP request via wp_remote_post().

Scaling
Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions
7

Executed per call on PHP 8.5. The body compiles to 7.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
0

Nothing in core calls this; the cost is only what you spend yourself.

What it touches

  • transienttransientget_site_transient()one call below WP_Debug_Data::check_for_updates()
  • hookthird-party callbacksapply_filters()one call below WP_Debug_Data::check_for_updates()
  • optionnetwork optionget_site_option()one call below WP_Debug_Data::check_for_updates()
  • httpoutbound HTTP requestwp_remote_post()one call below WP_Debug_Data::check_for_updates()

Further down the call graph this can also reach cache, serialize 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 · 1 distinct outcome

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

WhenInstructionsCalls it makes
always7wp_version_check(), wp_update_plugins(), wp_update_themes()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 7 instructions, 7 executed per call, 0 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 · 3

  • wp_version_check()Checks WordPress version against the newest version.
  • wp_update_plugins()Checks for available updates to plugins based on the latest versions hosted on WordPress.org.
  • wp_update_themes()Checks for available updates to themes based on the latest versions hosted on WordPress.org.

Source code

View on Trac View on GitHub 

	public static function check_for_updates() {		wp_version_check();		wp_update_plugins();		wp_update_themes();	}

Changelog

Introduced in 5.2.0. 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/class-wp-debug-data.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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