wppaste
WordPress

get_tag_feed_link( int|WP_Term|object $tag, string $feed = '' ): string

Since
2.3.0
Source
wp-includes/link-template.php:1020
Retrieves the permalink for a tag feed.

Compatibility

WordPress
since 2.3.0
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

$tagint|WP_Term|object
The ID or term object whose feed link will be retrieved.
$feedstringoptional
Feed type. Possible values include 'rss2', 'atom'.
Default is the value of get_default_feed().Default: ''

Return value

string
The feed permalink for the given tag.

Performance profile

How much work a call to get_tag_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
Heavy

Reaches the database via get_term().

Scaling
Constant

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

Instructions
8

Executed per call on PHP 8.5. The body compiles to 8.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
2

2 places in core call this, so the cost is paid more often than your own code shows.

What it touches

  • querycontent queryget_term()one call below get_tag_feed_link()
  • optionoption read or writeget_option()one call below get_tag_feed_link()
  • hookthird-party callbacksapply_filters()one call below get_tag_feed_link()

Further down the call graph this can also reach cache, 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_tag_feed_link() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
always8get_term_feed_link()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 8 instructions, 8 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 · 1

Used by · 2

Source code

View on Trac View on GitHub 

function get_tag_feed_link( $tag, $feed = '' ) {	return get_term_feed_link( $tag, 'post_tag', $feed );}

Changelog

Introduced in 2.3.0. 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 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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