wp_render_block_style_variation_class_name( string $block_content, array $block ): string
- Since
- 6.6.0
- Source
wp-includes/block-supports/block-style-variations.php:221
render_block_data filter gets applied to the block's markup.Compatibility
- WordPress
- since 6.6.0
- 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
$block_contentstring- Rendered block content.
$blockarray- Block object.
Return value
string- Filtered block content.
Performance profile
How much work a call to wp_render_block_style_variation_class_name() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Trivial
- Scaling
- Constant
- Instructions
- 4–32
- Plugin surface
- None
- Called by
- 0
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 35.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
What one call costs · 4 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost wp_render_block_style_variation_class_name() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 4–11 | none |
!empty($value) && is_string($block_class_name) && empty($matches) | 18 | preg_match() |
!empty($value) && is_string($block_class_name) && !empty($matches) && !->next_tag() | 27 | preg_match(), ->next_tag(), ->get_updated_html() |
!empty($value) && is_string($block_class_name) && !empty($matches) && ->next_tag() | 32 | preg_match(), ->next_tag(), ->add_class(), ->get_updated_html() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 35 instructions, 4–32 executed per call, 5 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 · 1
- WP_HTML_Tag_Processor::__construct()Constructor.
Source code
function wp_render_block_style_variation_class_name( $block_content, $block ) { if ( ! $block_content || empty( $block['attrs']['className'] ) ) { return $block_content; } $block_class_name = $block['attrs']['className']; if ( ! is_string( $block_class_name ) ) { return $block_content; } /* * Matches a class prefixed by `is-style`, followed by the * variation slug, then `--`, and finally an instance number. */ preg_match( '/\bis-style-(\S+?--\d+)\b/', $block_class_name, $matches ); if ( empty( $matches ) ) { return $block_content; } $tags = new WP_HTML_Tag_Processor( $block_content ); if ( $tags->next_tag() ) { /* * Ensure the variation instance class name set in the * `render_block_data` filter is applied in markup. * See `wp_render_block_style_variation_support_styles`. */ $tags->add_class( $matches[0] ); } return $tags->get_updated_html();}Changelog
Introduced in 6.6.0. 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-includes/block-supports/block-style-variations.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.