WP_REST_Server::get_headers( array $server ): array
- Since
- 4.4.0
- Source
wp-includes/rest-api/class-wp-rest-server.php:1966
Compatibility
- WordPress
- since 4.4.0
- 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
$serverarray- Associative array similar to
$_SERVER.
Return value
array- Headers extracted from the input.
Performance profile
How much work a call to WP_REST_Server::get_headers() 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
- Light
- Scaling
- Scales with input
- Instructions
- 5–6
- Plugin surface
- None
- Called by
- 1
Touches nothing outside its own arguments.
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 25.
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 one call costs · 1 distinct outcome
One number would be a lie: the work depends on which branch runs. These are every distinct cost WP_REST_Server::get_headers() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 5–6 | none |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 25 | 5–6 | 6 | |
| 8.5 | 25 | 5–6 | 6 | |
| 8.4 | 25 | 5–6 | 6 | 6 fewer instructions than PHP 8.3 |
| 8.3 | 31 | 5–6 | 6 | |
| 8.2 | 31 | 5–6 | 6 | |
| 8.1 | 31 | 5–6 | 6 | |
| 7.4 | 31 | 5–6 | 6 |
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
- str_starts_with()Polyfill for `str_starts_with()` function added in PHP 8.0.
Used by · 1
- WP_REST_Server::serve_request()Handles serving a REST API request.
Source code
public function get_headers( $server ) { $headers = array(); // CONTENT_* headers are not prefixed with HTTP_. $additional = array( 'CONTENT_LENGTH' => true, 'CONTENT_MD5' => true, 'CONTENT_TYPE' => true, ); foreach ( $server as $key => $value ) { if ( str_starts_with( $key, 'HTTP_' ) ) { $headers[ substr( $key, 5 ) ] = $value; } elseif ( 'REDIRECT_HTTP_AUTHORIZATION' === $key && empty( $server['HTTP_AUTHORIZATION'] ) ) { /* * In some server configurations, the authorization header is passed in this alternate location. * Since it would not be passed in in both places we do not check for both headers and resolve. */ $headers['AUTHORIZATION'] = $value; } elseif ( isset( $additional[ $key ] ) ) { $headers[ $key ] = $value; } } return $headers; }Changelog
Introduced in 4.4.0. 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 6.9.7 tag, from
src/wp-includes/rest-api/class-wp-rest-server.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.