_upgrade_cron_array( array $cron ): array
- Since
- 2.1.0
- Source
wp-includes/cron.php:1317
Description
This function upgrades the cron info array to version 2.
Compatibility
- WordPress
- since 2.1.0
- 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
$cronarray- Cron info array from _get_cron_array().
Return value
array- An upgraded cron info array.
Performance profile
How much work a call to _upgrade_cron_array() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Heavy
- Scaling
- Scales with input
- Instructions
- 7–19
- Plugin surface
- None
- Called by
- 1
Reads stored settings via update_option(), cached per request but not free on a cold cache.
The body loops, so the work grows with what you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 40.
Nothing here hands control to plugin code.
1 place in core call this, so the cost is paid more often than your own code shows.
What it touches
- optionoption read or write
update_option()called directly - hookthird-party callbacks
apply_filters()one call below _upgrade_cron_array() - serializeserialisation
maybe_serialize()one call below _upgrade_cron_array() - cacheobject cache
wp_cache_get()one call below _upgrade_cron_array()
Further down the call graph this can also reach query and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost _upgrade_cron_array() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
isset($cron) | 7 | none |
| always | 15–19 | update_option() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 40 instructions, 7–19 executed per call, 6 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 · 1
- update_option()Updates the value of an option that was already added.
Used by · 1
- _get_cron_array()Retrieves cron info array option.
Source code
function _upgrade_cron_array( $cron ) { if ( isset( $cron['version'] ) && 2 === $cron['version'] ) { return $cron; } $new_cron = array(); foreach ( (array) $cron as $timestamp => $hooks ) { foreach ( (array) $hooks as $hook => $args ) { $key = md5( serialize( $args['args'] ) ); $new_cron[ $timestamp ][ $hook ][ $key ] = $args; } } $new_cron['version'] = 2; update_option( 'cron', $new_cron, true ); return $new_cron;}Changelog
Introduced in 2.1.0. 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 7.0.4 tag, from
src/wp-includes/cron.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.