twentyfifteen_get_link_url(): string
- Since
- Twenty Fifteen 1.0
- Source
wp-content/themes/twentyfifteen/inc/template-tags.php:246
Description
Falls back to the post permalink if no URL is found in the post.
Compatibility
- WordPress
- since Twenty Fifteen 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.
Return value
string- The Link format URL.
Performance profile
How much work a call to twentyfifteen_get_link_url() 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
- Constant
- Instructions
- 8–17
- Plugin surface
- 1 hook
- Called by
- 0
Reaches the database via get_post().
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 18.
Third-party callbacks on 'the_permalink' run inside this call, and their cost is not bounded by anything here.
Nothing in core calls this; the cost is only what you spend yourself.
What it touches
- hookthird-party callbacks
apply_filters()called directly - querycontent query
get_post()called directly - optionoption read or write
get_option()one call below twentyfifteen_get_link_url()
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 · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost twentyfifteen_get_link_url() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 8 | get_the_content(), get_url_in_content() |
| always | 17 | get_the_content(), get_url_in_content(), get_permalink(), get_post(), apply_filters() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 18 instructions, 8–17 executed per call, 1 branch. 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.
Hooks and filters fired · 1
One hook fires while twentyfifteen_get_link_url() runs, in this order:
- apply_filters( the_permalink )filterline 250 (+4 into the body)
Filters the display of the permalink for the current post.
Uses · 5
- get_url_in_content()Extracts and returns the first URL from passed content.
- get_the_content()Retrieves the post content.
- apply_filters()Calls the callback functions that have been added to a filter hook.
- get_permalink()Retrieves the full permalink for the current post or post ID.
- get_post()Retrieves post data given a post ID or post object.
Source code
function twentyfifteen_get_link_url() { $has_url = get_url_in_content( get_the_content() ); /** This filter is documented in wp-includes/link-template.php */ return $has_url ? $has_url : apply_filters( 'the_permalink', get_permalink(), get_post() ); }Changelog
Introduced in Twenty Fifteen 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 7.1.0 tag, from
src/wp-content/themes/twentyfifteen/inc/template-tags.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.