get_feed_link( string $feed = '' ): string
- Since
- 1.5.0
- Source
wp-includes/link-template.php:693
Compatibility
- WordPress
- since 1.5.0
- 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
$feedstringoptional- Feed type. Possible values include 'rss2', 'atom'.
Default is the value of get_default_feed().Default:''
Return value
string- The feed permalink.
Performance profile
How much work a call to get_feed_link() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Trivial
- Scaling
- Constant
- Instructions
- 21–41
- Plugin surface
- 1 hook
- Called by
- 4
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 56.
Third-party callbacks on 'feed_link' run inside this call, and their cost is not bounded by anything here.
4 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- hookthird-party callbacks
apply_filters()called directly
Further down the call graph this can also reach option, cache, serialize, query and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.
What one call costs · 4 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost get_feed_link() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
!empty($feed) | 21–24 | ->get_feed_permastruct(), home_url(), apply_filters() |
empty($feed) | 24–27 | ->get_feed_permastruct(), get_default_feed(), home_url(), apply_filters() |
!$feed | 34–35 | ->get_feed_permastruct(), get_default_feed(), user_trailingslashit(), home_url(), apply_filters() |
$feed | 40–41 | ->get_feed_permastruct(), ->get_comment_feed_permastruct(), get_default_feed(), user_trailingslashit(), home_url(), apply_filters() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 56 | 21–41 | 5 | |
| 8.5 | 56 | 21–41 | 5 | |
| 8.4 | 56 | 21–41 | 5 | 18 fewer instructions than PHP 8.3 |
| 8.3 | 74 | 24–53 | 5 | |
| 8.2 | 74 | 24–53 | 5 | |
| 8.1 | 74 | 24–53 | 5 | |
| 7.4 | 74 | 24–53 | 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.
Hooks and filters fired · 1
One hook fires while get_feed_link() runs, in this order:
Uses · 5
- str_contains()Polyfill for `str_contains()` function added in PHP 8.0.
- get_default_feed()Retrieves the default feed.
- home_url()Retrieves the URL for the current site where the front end is accessible.
- user_trailingslashit()Retrieves a trailing-slashed string if the site is set for adding trailing slashes.
- apply_filters()Calls the callback functions that have been added to a filter hook.
Used by · 4
- feed_links()Displays the links to the general feeds.
- get_bloginfo()Retrieves information about the current site.
- redirect_canonical()Redirects incoming links to the proper URL based on the site url.
- the_feed_link()Displays the permalink for the feed type.
Source code
function get_feed_link( $feed = '' ) { global $wp_rewrite; $permalink = $wp_rewrite->get_feed_permastruct(); if ( $permalink ) { if ( str_contains( $feed, 'comments_' ) ) { $feed = str_replace( 'comments_', '', $feed ); $permalink = $wp_rewrite->get_comment_feed_permastruct(); } if ( get_default_feed() === $feed ) { $feed = ''; } $permalink = str_replace( '%feed%', $feed, $permalink ); $permalink = preg_replace( '#/+#', '/', "/$permalink" ); $output = home_url( user_trailingslashit( $permalink, 'feed' ) ); } else { if ( empty( $feed ) ) { $feed = get_default_feed(); } if ( str_contains( $feed, 'comments_' ) ) { $feed = str_replace( 'comments_', 'comments-', $feed ); } $output = home_url( "?feed={$feed}" ); } /** * Filters the feed type permalink. * * @since 1.5.0 * * @param string $output The feed permalink. * @param string $feed The feed type. Possible values include 'rss2', 'atom', * or an empty string for the default feed type. */ return apply_filters( 'feed_link', $output, $feed );}Changelog
Introduced in 1.5.0. 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 7.1.0 tag, from
src/wp-includes/link-template.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
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