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twentynineteen_post_thumbnail_sizes_attr( string[] $attr ): string[]

Since
Twenty Nineteen 1.0
Source
wp-content/themes/twentynineteen/inc/template-functions.php:111
Adds custom 'sizes' attribute to responsive image functionality for post thumbnails.

Compatibility

WordPress
since Twenty Nineteen 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.

Parameters

$attrstring[]
Array of attribute values for the image markup, keyed by attribute name.
See wp_get_attachment_image().

Return value

string[]
The filtered attributes for the image markup.

Performance profile

How much work a call to twentynineteen_post_thumbnail_sizes_attr() 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

Touches nothing outside its own arguments.

Scaling
Constant

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

Instructions
5–10

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 11.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
0

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 twentynineteen_post_thumbnail_sizes_attr() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
is_admin()5is_admin()
!is_admin()8–10is_admin(), is_singular()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 11 instructions, 5–10 executed per call, 2 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 · 2

  • is_admin()Determines whether the current request is for an administrative interface page.
  • is_singular()Determines whether the query is for an existing single post of any post type (post, attachment, page, custom post types).

Source code

View on Trac View on GitHub 

function twentynineteen_post_thumbnail_sizes_attr( $attr ) { 	if ( is_admin() ) {		return $attr;	} 	if ( ! is_singular() ) {		$attr['sizes'] = '(max-width: 34.9rem) calc(100vw - 2rem), (max-width: 53rem) calc(8 * (100vw / 12)), (min-width: 53rem) calc(6 * (100vw / 12)), 100vw';	} 	return $attr;}

Changelog

Introduced in Twenty Nineteen 1.0. 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-content/themes/twentynineteen/inc/template-functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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