wppaste
WordPress

get_blog_post( int $blog_id, int $post_id ): WP_Post|null

Since
MU (3.0.0)
Source
wp-includes/ms-functions.php:140
Gets a blog post from any site on the network.

Description

This function is similar to get_post(), except that it can retrieve a post from any site on the network, not just the current site.

Compatibility

WordPress
since MU (3.0.0)
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
ID of the blog.
$post_idint
ID of the post being looked for.

Return value

WP_Post|null
WP_Post object on success, null on failure

Performance profile

How much work a call to get_blog_post() 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

Reaches the database via get_post().

Scaling
Constant

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

Instructions
12

Executed per call on PHP 8.5. The body compiles to 12.

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 it touches

  • querycontent queryget_post()called directly
  • hookthird-party callbacksdo_action()one call below get_blog_post()
  • cacheobject cachewp_cache_switch_to_blog()one call below get_blog_post()

Further down the call graph this can also reach option, 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 · 1 distinct outcome

One number would be a lie: the work depends on which branch runs. These are every distinct cost get_blog_post() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
always12switch_to_blog(), get_post(), restore_current_blog()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 12 instructions, 12 executed per call, 0 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 · 3

Source code

View on Trac View on GitHub 

function get_blog_post( $blog_id, $post_id ) {	switch_to_blog( $blog_id );	$post = get_post( $post_id );	restore_current_blog(); 	return $post;}

Changelog

Introduced in MU (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.

About this page

Parsed data
Generated from the wordpress-develop 6.8.8 tag, from src/wp-includes/ms-functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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