wxr_authors_list( int[] $post_ids = null )
- Since
- 3.1.0
- Source
wp-admin/includes/export.php:404
Compatibility
- WordPress
- since 3.1.0
- 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
$post_idsint[]optional- Array of post IDs to filter the query by.Default:
null
Performance profile
How much work a call to wxr_authors_list() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Heavy
- Scaling
- Scales with input
- Instructions
- 25–35
- Plugin surface
- None
- Called by
- 1
Reaches the database via ->get_results().
The body loops, so the work grows with what you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 92.
Nothing here hands control to plugin code.
1 place in core call this, so the cost is paid more often than your own code shows.
What it touches
- sqldatabase query
->get_results()called directly - querycontent query
get_user_by()one call below wxr_authors_list()
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost wxr_authors_list() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
empty($post_ids) | 25–27 | ->get_results(), array_filter() |
!empty($post_ids) | 33–35 | array_map(), ->get_results(), array_filter() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 92 | 25–35 | 5 | |
| 8.5 | 92 | 25–35 | 5 | |
| 8.4 | 92 | 25–35 | 5 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 95 | 25–38 | 5 | |
| 8.2 | 95 | 25–38 | 5 | |
| 8.1 | 95 | 25–38 | 5 | |
| 7.4 | 95 | 25–38 | 5 |
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_userdata()Retrieves user info by user ID.
- wxr_cdata()Wraps given string in XML CDATA tag.
Used by · 1
- export_wp()Generates the WXR export file for download.
Source code
function wxr_authors_list( ?array $post_ids = null ) { global $wpdb; if ( ! empty( $post_ids ) ) { $post_ids = array_map( 'absint', $post_ids ); $and = 'AND ID IN ( ' . implode( ', ', $post_ids ) . ')'; } else { $and = ''; } $authors = array(); $results = $wpdb->get_results( "SELECT DISTINCT post_author FROM $wpdb->posts WHERE post_status != 'auto-draft' $and" ); foreach ( (array) $results as $result ) { $authors[] = get_userdata( $result->post_author ); } $authors = array_filter( $authors ); foreach ( $authors as $author ) { echo "\t<wp:author>"; echo '<wp:author_id>' . (int) $author->ID . '</wp:author_id>'; echo '<wp:author_login>' . wxr_cdata( $author->user_login ) . '</wp:author_login>'; echo '<wp:author_email>' . wxr_cdata( $author->user_email ) . '</wp:author_email>'; echo '<wp:author_display_name>' . wxr_cdata( $author->display_name ) . '</wp:author_display_name>'; echo '<wp:author_first_name>' . wxr_cdata( $author->first_name ) . '</wp:author_first_name>'; echo '<wp:author_last_name>' . wxr_cdata( $author->last_name ) . '</wp:author_last_name>'; echo "</wp:author>\n"; } }Changelog
Introduced in 3.1.0. 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 6.7.7 tag, from
src/wp-admin/includes/export.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.