_preload_old_requests_classes_and_interfaces( string $to )
- Since
- 6.2.0
- Source
wp-admin/includes/update-core.php:1948
Description
This function preloads the old Requests code into memory before the upgrade process deletes the files. Why? Requests code is loaded into memory via an autoloader, meaning when a class or interface is needed If a request is in process, Requests could attempt to access code. If the file is not there, a fatal error could occur. If the file was replaced, the new code is not compatible with the old, resulting in a fatal error. Preloading ensures the code is in memory before the code is updated.
Compatibility
- WordPress
- since 6.2.0
- 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.
Parameters
$tostring- Path to old WordPress installation.
Performance profile
How much work a call to _preload_old_requests_classes_and_interfaces() 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
- Trivial
- Scaling
- Constant
- Instructions
- 17
- Plugin surface
- None
- Called by
- 1
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5. The body compiles to 52.
Nothing here hands control to plugin code.
1 place in core call this, so the cost is paid more often than your own code shows.
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 _preload_old_requests_classes_and_interfaces() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 17 | ->set_bookmark() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 52 | 17 | 8 | |
| 8.5 | 52 | 17 | 8 | 17 more instructions than PHP 8.4 |
| 8.4 | 35 | 11–17 | 8 | 2 fewer instructions than PHP 8.3 |
| 8.3 | 37 | 11–17 | 8 | |
| 8.2 | 37 | 11–17 | 8 | |
| 8.1 | 37 | 11–17 | 8 | |
| 7.4 | 37 | 11–17 | 8 |
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.
Used by · 1
- update_core()Upgrades the core of WordPress.
Source code
function _preload_old_requests_classes_and_interfaces( $to ) { global $_old_requests_files, $wp_filesystem, $wp_version; /* * Requests was introduced in WordPress 4.6. * * Skip preloading if the website was previously using * an earlier version of WordPress. */ if ( version_compare( $wp_version, '4.6', '<' ) ) { return; } if ( ! defined( 'REQUESTS_SILENCE_PSR0_DEPRECATIONS' ) ) { define( 'REQUESTS_SILENCE_PSR0_DEPRECATIONS', true ); } foreach ( $_old_requests_files as $name => $file ) { // Skip files that aren't interfaces or classes. if ( is_int( $name ) ) { continue; } // Skip if it's already loaded. if ( class_exists( $name ) || interface_exists( $name ) ) { continue; } // Skip if the file is missing. if ( ! $wp_filesystem->is_file( $to . $file ) ) { continue; } require_once $to . $file; }}Changelog
Introduced in 6.2.0. Unchanged from 6.7.7 through 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/update-core.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
- Something wrong on this page? Report it and it gets fixed in the next regeneration.