core_update_footer( string $msg = '' ): string
- Since
- 2.3.0
- Source
wp-admin/includes/update.php:247
Compatibility
- WordPress
- since 2.3.0
- 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
$msgstringoptional- Default:
''
Return value
string- The core update footer message.
Performance profile
How much work a call to core_update_footer() 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
- Moderate
- Scaling
- Constant
- Instructions
- 17–47
- Plugin surface
- None
- Called by
- 0
Reads stored settings via get_option(), cached per request but not free on a cold cache.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 91.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
What it touches
- optionoption read or write
get_option()one call below core_update_footer() - hookthird-party callbacks
apply_filters()one call below core_update_footer()
Further down the call graph this can also reach cache, serialize, transient 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 · 4 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost core_update_footer() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
!current_user_can() | 17 | current_user_can(), __(), get_bloginfo(), sprintf() |
current_user_can() | 33–44 | current_user_can(), get_preferred_from_update_core(), wp_get_wp_version(), __(), get_bloginfo(), sprintf() |
current_user_can() | 34–41 | current_user_can(), get_preferred_from_update_core(), wp_get_wp_version(), __(), get_bloginfo(), network_admin_url(), sprintf() |
current_user_can() | 38–47 | current_user_can(), get_preferred_from_update_core(), wp_get_wp_version(), network_admin_url(), __(), sprintf() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 91 | 17–47 | 7 | |
| 8.5 | 91 | 17–47 | 7 | |
| 8.4 | 91 | 17–47 | 7 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 94 | 17–50 | 7 | |
| 8.2 | 94 | 17–50 | 7 | |
| 8.1 | 94 | 17–50 | 7 | |
| 7.4 | 94 | 17–50 | 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 · 7
- current_user_can()Returns whether the current user has the specified capability.
- __()Retrieves the translation of $text.
- get_bloginfo()Retrieves information about the current site.
- get_preferred_from_update_core()Selects the first update version from the update_core option.
- wp_get_wp_version()Returns the current WordPress version.
- network_admin_url()Retrieves the URL to the admin area for the network.
- stdClass::__construct()
Source code
function core_update_footer( $msg = '' ) { if ( ! current_user_can( 'update_core' ) ) { /* translators: %s: WordPress version. */ return sprintf( __( 'Version %s' ), get_bloginfo( 'version', 'display' ) ); } $cur = get_preferred_from_update_core(); if ( ! is_object( $cur ) ) { $cur = new stdClass(); } if ( ! isset( $cur->current ) ) { $cur->current = ''; } if ( ! isset( $cur->response ) ) { $cur->response = ''; } $is_development_version = preg_match( '/alpha|beta|RC/', wp_get_wp_version() ); if ( $is_development_version ) { return sprintf( /* translators: 1: WordPress version number, 2: URL to WordPress Updates screen. */ __( 'You are using a development version (%1$s). Cool! Please <a href="%2$s">stay updated</a>.' ), get_bloginfo( 'version', 'display' ), network_admin_url( 'update-core.php' ) ); } switch ( $cur->response ) { case 'upgrade': return sprintf( '<strong><a href="%s">%s</a></strong>', network_admin_url( 'update-core.php' ), /* translators: %s: WordPress version. */ sprintf( __( 'Get Version %s' ), $cur->current ) ); case 'latest': default: /* translators: %s: WordPress version. */ return sprintf( __( 'Version %s' ), get_bloginfo( 'version', 'display' ) ); }}Changelog
Introduced in 2.3.0. 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.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.