Core_Upgrader::check_files(): bool
- Since
- 3.7.0
- Source
wp-admin/includes/class-core-upgrader.php:403
Compatibility
- WordPress
- since 3.7.0
- 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.
Return value
bool- True if the checksums match, otherwise false.
Performance profile
How much work a call to Core_Upgrader::check_files() 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
- Scaling
- Scales with input
- Instructions
- 11–31
- Plugin surface
- None
- Called by
- 1
Reaches an outbound HTTP request via wp_remote_get().
The body loops, so the work grows with how much data it finds.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 34.
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 it touches
- filesystemfilesystem access
file_exists()called directly - httpoutbound HTTP request
wp_remote_get()one call below Core_Upgrader::check_files()
Further down the call graph this can also reach hook, query, option, cache, serialize 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 · 3 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost Core_Upgrader::check_files() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 11–15 | get_core_checksums() |
is_array($checksums) && !$checksums && !$file && !file_exists() | 23–24 | get_core_checksums(), file_exists() |
is_array($checksums) && !$checksums && !$file && file_exists() && $checksum !== false | 30–31 | get_core_checksums(), file_exists(), md5_file() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 34 | 11–31 | 7 | |
| 8.5 | 34 | 11–31 | 7 | |
| 8.4 | 34 | 11–31 | 7 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 37 | 11–34 | 7 | |
| 8.2 | 37 | 11–34 | 7 | |
| 8.1 | 37 | 11–34 | 7 | |
| 7.4 | 37 | 11–34 | 7 |
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 · 2
- get_core_checksums()Gets and caches the checksums for the given version of WordPress.
- str_starts_with()Polyfill for `str_starts_with()` function added in PHP 8.0.
Used by · 1
- Core_Upgrader::upgrade()Upgrades WordPress core.
Source code
public function check_files() { global $wp_version, $wp_local_package; $checksums = get_core_checksums( $wp_version, $wp_local_package ?? 'en_US' ); if ( ! is_array( $checksums ) ) { return false; } foreach ( $checksums as $file => $checksum ) { // Skip files which get updated. if ( str_starts_with( $file, 'wp-content' ) ) { continue; } if ( ! file_exists( ABSPATH . $file ) || md5_file( ABSPATH . $file ) !== $checksum ) { return false; } } return true; }Changelog
Introduced in 3.7.0. 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/class-core-upgrader.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.