WP_Theme_JSON::get_viewport_breakpoint_value_in_pixels( mixed $value ): float|null
- Since
- 7.1.0
- Source
wp-includes/class-wp-theme-json.php:790
Description
Generated media queries keep the original units. This method only normalizes values so mobile and tablet can be compared safely. em and rem lengths use a 16px base for comparison.
Compatibility
- WordPress
- since 7.1.0
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in 1 of the 5 tracked releases, added in 7.1.0, and compiles on PHP 7.4 through 8.6-dev.
Parameters
$valuemixed- Viewport breakpoint size.
Return value
float|null- Viewport breakpoint size in pixels, or null when invalid.
Performance profile
How much work a call to WP_Theme_JSON::get_viewport_breakpoint_value_in_pixels() 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
- 6–19
- 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 25.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
What one call costs · 1 distinct outcome
One number would be a lie: the work depends on which branch runs. These are every distinct cost WP_Theme_JSON::get_viewport_breakpoint_value_in_pixels() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 6–19 | ::is_valid_viewport_breakpoint_size() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 25 | 6–19 | 3 | |
| 8.5 | 25 | 6–19 | 3 | |
| 8.4 | 25 | 6–19 | 3 | 15 fewer instructions than PHP 8.3 |
| 8.3 | 40 | 6–31 | 3 | |
| 8.2 | 40 | 6–31 | 3 | |
| 8.1 | 40 | 6–31 | 3 | |
| 7.4 | 40 | 6–31 | 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
- static::is_valid_viewport_breakpoint_size()
Source code
private static function get_viewport_breakpoint_value_in_pixels( $value ) { if ( ! static::is_valid_viewport_breakpoint_size( $value ) ) { return null; } $value = trim( $value ); $unit = substr( $value, -3 ); if ( 'rem' === $unit ) { $number = (float) substr( $value, 0, -3 ); } else { $unit = substr( $value, -2 ); $number = (float) substr( $value, 0, -2 ); } /* * Use the most common browser default font size as the base for em/rem * media query conversions. This pixel value is only used to compare * breakpoint order; generated media queries keep the original units. */ return 'px' === $unit ? $number : $number * 16; }Changelog
Introduced in 7.1.0.
Signature, return type and hooks compared across 1 parsed release.
About this page
- Parsed data
- Generated from the wordpress-develop 7.1.0 tag, from
src/wp-includes/class-wp-theme-json.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.