block_core_details_set_img_fetchpriority_low( string $block_content, array $block ): string
- Since
- 7.0.0
- Source
wp-includes/blocks/details.php:20
Description
Images in a collapsed Details block are hidden until the block is expanded, so they should not compete with any resources in the critical rendering path, such as the LCP element image.
Compatibility
- WordPress
- since 7.0.0
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in 2 of the 5 tracked releases, added in 7.0.0, and compiles on PHP 7.4 through 8.6-dev.
Parameters
$block_contentstring- The block content.
$blockarray- The full block, including name and attributes.
Return value
string- Modified HTML with fetchpriority="low" on all IMG tags when the showContent attribute is false.
Performance profile
How much work a call to block_core_details_set_img_fetchpriority_low() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Trivial
- Scaling
- Scales with input
- Instructions
- 5–22
- Plugin surface
- None
- Called by
- 0
Touches nothing outside its own arguments.
The body loops, so the work grows with what you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 28.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost block_core_details_set_img_fetchpriority_low() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 5–10 | none |
is_string($block_content) && !->next_tag() | 21–22 | ->next_tag(), ->get_updated_html() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 28 | 5–22 | 4 | |
| 8.5 | 28 | 5–22 | 4 | |
| 8.4 | 28 | 5–22 | 4 | |
| 8.3 | 28 | 5–22 | 4 | |
| 8.2 | 28 | 5–22 | 4 | 1 fewer instruction than PHP 8.1 |
| 8.1 | 29 | 5–22 | 4 | |
| 7.4 | 29 | 5–22 | 4 |
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
- WP_HTML_Tag_Processor::__construct()Constructor.
Changelog
Introduced in 7.0.0. Unchanged from 7.0.4 through 7.1.0.
Signature, return type and hooks compared across 2 parsed releases.
About this page
- Parsed data
- Generated from the wordpress-develop 7.1.0 tag, from
src/wp-includes/blocks/details.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.