twenty_twenty_one_post_thumbnail(): void
- Since
- Twenty Twenty-One 1.0
- Source
wp-content/themes/twentytwentyone/inc/template-tags.php:179
Description
Wraps the post thumbnail in an anchor element on index views, or a div element when on single views.
Compatibility
- WordPress
- since Twenty Twenty-One 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
void
Performance profile
How much work a call to twenty_twenty_one_post_thumbnail() 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
- 4–35
- Plugin surface
- None
- 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 61.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
What it touches
- hookthird-party callbacks
apply_filters()one call below twenty_twenty_one_post_thumbnail() - querycontent query
get_post()one call below twenty_twenty_one_post_thumbnail()
Further down the call graph this can also reach option, 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 · 5 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost twenty_twenty_one_post_thumbnail() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
!twenty_twenty_one_can_show_post_thumbnail() | 4 | twenty_twenty_one_can_show_post_thumbnail() |
twenty_twenty_one_can_show_post_thumbnail() && is_singular() && !wp_get_attachment_caption() | 23 | twenty_twenty_one_can_show_post_thumbnail(), is_singular(), the_post_thumbnail(), get_post_thumbnail_id(), wp_get_attachment_caption() |
twenty_twenty_one_can_show_post_thumbnail() && !is_singular() && !wp_get_attachment_caption() | 24 | twenty_twenty_one_can_show_post_thumbnail(), is_singular(), the_permalink(), the_post_thumbnail(), get_post_thumbnail_id(), wp_get_attachment_caption() |
twenty_twenty_one_can_show_post_thumbnail() && is_singular() && wp_get_attachment_caption() | 34 | twenty_twenty_one_can_show_post_thumbnail(), is_singular(), the_post_thumbnail(), get_post_thumbnail_id(), wp_get_attachment_caption(), get_post_thumbnail_id(), wp_get_attachment_caption(), wp_kses_post() |
twenty_twenty_one_can_show_post_thumbnail() && !is_singular() && wp_get_attachment_caption() | 35 | twenty_twenty_one_can_show_post_thumbnail(), is_singular(), the_permalink(), the_post_thumbnail(), get_post_thumbnail_id(), wp_get_attachment_caption(), get_post_thumbnail_id(), wp_get_attachment_caption(), wp_kses_post() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 61 instructions, 4–35 executed per call, 4 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 · 7
- twenty_twenty_one_can_show_post_thumbnail()Determines if post thumbnail can be displayed.
- is_singular()Determines whether the query is for an existing single post of any post type (post, attachment, page, custom post types).
- the_post_thumbnail()Displays the post thumbnail.
- wp_get_attachment_caption()Retrieves the caption for an attachment.
- get_post_thumbnail_id()Retrieves the post thumbnail ID.
- wp_kses_post()Sanitizes content for allowed HTML tags for post content.
- the_permalink()Displays the permalink for the current post.
Source code
function twenty_twenty_one_post_thumbnail() { if ( ! twenty_twenty_one_can_show_post_thumbnail() ) { return; } ?> <?php if ( is_singular() ) : ?> <figure class="post-thumbnail"> <?php // Lazy-loading attributes should be skipped for thumbnails since they are immediately in the viewport. the_post_thumbnail( 'post-thumbnail', array( 'loading' => false ) ); ?> <?php if ( wp_get_attachment_caption( get_post_thumbnail_id() ) ) : ?> <figcaption class="wp-caption-text"><?php echo wp_kses_post( wp_get_attachment_caption( get_post_thumbnail_id() ) ); ?></figcaption> <?php endif; ?> </figure><!-- .post-thumbnail --> <?php else : ?> <figure class="post-thumbnail"> <a class="post-thumbnail-inner alignwide" href="<?php the_permalink(); ?>" aria-hidden="true" tabindex="-1"> <?php the_post_thumbnail( 'post-thumbnail' ); ?> </a> <?php if ( wp_get_attachment_caption( get_post_thumbnail_id() ) ) : ?> <figcaption class="wp-caption-text"><?php echo wp_kses_post( wp_get_attachment_caption( get_post_thumbnail_id() ) ); ?></figcaption> <?php endif; ?> </figure><!-- .post-thumbnail --> <?php endif; ?> <?php }Changelog
Introduced in Twenty Twenty-One 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/twentytwentyone/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.