setup_userdata( int $for_user_id = 0 )
- Since
- 2.0.4
- Source
wp-includes/user.php:1601
Description
Used by wp_set_current_user() for back compat. Might be deprecated in the future.
Compatibility
- WordPress
- since 2.0.4
- 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
$for_user_idintoptional- User ID to set up global data. Default 0.Default:
0
Performance profile
How much work a call to setup_userdata() 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
- Constant
- Instructions
- 22–33
- Plugin surface
- None
- Called by
- 1
Reaches the database via get_user_by().
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 41.
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
- querycontent query
get_user_by()one call below setup_userdata()
Further down the call graph this can also reach hook. That is 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 setup_userdata() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 22–30 | get_userdata() |
| always | 25–33 | get_current_user_id(), get_userdata() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 41 instructions, 22–33 executed per call, 2 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 · 2
- get_current_user_id()Gets the current user's ID.
- get_userdata()Retrieves user info by user ID.
Used by · 1
- wp_set_current_user()Changes the current user by ID or name.
Source code
function setup_userdata( $for_user_id = 0 ) { global $user_login, $userdata, $user_level, $user_ID, $user_email, $user_url, $user_identity; if ( ! $for_user_id ) { $for_user_id = get_current_user_id(); } $user = get_userdata( $for_user_id ); if ( ! $user ) { $user_ID = 0; $user_level = 0; $userdata = null; $user_login = ''; $user_email = ''; $user_url = ''; $user_identity = ''; return; } $user_ID = (int) $user->ID; $user_level = (int) $user->user_level; $userdata = $user; $user_login = $user->user_login; $user_email = $user->user_email; $user_url = $user->user_url; $user_identity = $user->display_name;}Changelog
Introduced in 2.0.4. 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 6.8.8 tag, from
src/wp-includes/user.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.