twenty_twenty_one_generate_css( string $selector, string $style, string $value, string $prefix = '', string $suffix = '', bool $display = true ): string
- Since
- Twenty Twenty-One 1.0
- Source
wp-content/themes/twentytwentyone/inc/custom-css.php:23
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.
Parameters
$selectorstring- The CSS selector.
$stylestring- The CSS style.
$valuestring- The CSS value.
$prefixstringoptional- The CSS prefix.Default:
'' $suffixstringoptional- The CSS suffix.Default:
'' $displaybooloptional- Print the styles.Default:
true
Return value
string- Generated CSS.
Performance profile
How much work a call to twenty_twenty_one_generate_css() 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
- Constant
- Instructions
- 8–22
- Plugin surface
- None
- Called by
- 1
Touches nothing outside its own arguments.
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 23.
Nothing here hands control to plugin code.
1 place in core call this, so the cost is paid more often than your own code shows.
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 twenty_twenty_one_generate_css() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 8–18 | none |
| always | 22 | wp_strip_all_tags() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 23 | 8–22 | 3 | |
| 8.5 | 23 | 8–22 | 3 | |
| 8.4 | 23 | 8–22 | 3 | 1 fewer instruction than PHP 8.3 |
| 8.3 | 24 | 8–23 | 3 | |
| 8.2 | 24 | 8–23 | 3 | |
| 8.1 | 24 | 8–23 | 3 | |
| 7.4 | 24 | 8–23 | 3 |
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_strip_all_tags()Properly strips all HTML tags including 'script' and 'style'.
Used by · 1
- twenty_twenty_one_get_non_latin_css()Gets custom CSS.
Source code
function twenty_twenty_one_generate_css( $selector, $style, $value, $prefix = '', $suffix = '', $display = true ) { // Bail early if there is no $selector elements or properties and $value. if ( ! $value || ! $selector ) { return ''; } $css = sprintf( '%s { %s: %s; }', $selector, $style, $prefix . $value . $suffix ); if ( $display ) { /* * Note to reviewers: $css contains auto-generated CSS. * It is included inside <style> tags and can only be interpreted as CSS on the browser. * Using wp_strip_all_tags() here is sufficient escaping to avoid * malicious attempts to close </style> and open a <script>. */ echo wp_strip_all_tags( $css ); } return $css;}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/custom-css.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.