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WordPress

current_user_can_for_blog( int $blog_id, string $capability, mixed $args ): bool

Since
3.0.0, 5.3.0, 5.8.0
Source
wp-includes/deprecated.php:6419
Returns whether the current user has the specified capability for a given site.

Compatibility

Deprecated in WordPress 6.7.0. Use current_user_can_for_site() instead.

WordPress
since 5.8.0
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

$blog_idint
Site ID.
$capabilitystring
Capability name.
$argsmixed
Optional further parameters, typically starting with an object ID.

Return value

bool
Whether the user has the given capability.

Performance profile

How much work a call to current_user_can_for_blog() 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

Touches nothing outside its own arguments.

Scaling
Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions
10

Executed per call on PHP 8.5. The body compiles to 10.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
0

Nothing in core calls this; the cost is only what you spend yourself.

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 current_user_can_for_blog() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
always10current_user_can_for_site()

Across PHP versions

PHPCompiledExecutedBranchesNotes
8.6-dev10100
8.510100
8.410100
8.310100
8.210100
8.1101001 more instruction than PHP 7.4
7.4990

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

Source code

View on Trac View on GitHub 

function current_user_can_for_blog( $blog_id, $capability, ...$args ) {	return current_user_can_for_site( $blog_id, $capability, ...$args );}

Changelog

Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.

  1. 6.7.7
  2. 6.8.8
  3. 6.9.7
  4. 7.0.4
  5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

6.7.0
Deprecated. Use current_user_can_for_site() instead.from the docblock
5.8.0
Wraps current_user_can() after switching to blog.from the docblock
5.3.0
Formalized the existing and already documented ...$args parameter by adding it to the function signature.from the docblock
3.0.0
Introduced.from the docblock

About this page

Parsed data
Generated from the wordpress-develop 7.1.0 tag, from src/wp-includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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