WP_HTML_Decoder::code_point_to_utf8_bytes( int $code_point ): string
- Since
- 6.6.0
- Source
wp-includes/html-api/class-wp-html-decoder.php:502
Description
This encoder implements the UTF-8 encoding algorithm for converting a code point into a byte sequence. If it receives an invalid code point it will return the Unicode Replacement Character U+FFFD �.
Example:
'🅰' === WP_HTML_Decoder::code_point_to_utf8_bytes( 0x1f170 );
// Half of a surrogate pair is an invalid code point.
'�' === WP_HTML_Decoder::code_point_to_utf8_bytes( 0xd83c );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
$code_pointint- Which code point to convert.
Return value
string- Converted code point, or
�if invalid.
Performance profile
How much work a call to WP_HTML_Decoder::code_point_to_utf8_bytes() 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
- 10–11
- 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 12.
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 · 1 distinct outcome
One number would be a lie: the work depends on which branch runs. These are every distinct cost WP_HTML_Decoder::code_point_to_utf8_bytes() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 10–11 | mb_chr() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 13 | 11–12 | 1 | 1 more instruction than PHP 8.5 |
| 8.5 | 12 | 10–11 | 1 | |
| 8.4 | 12 | 10–11 | 1 | |
| 8.3 | 12 | 10–11 | 1 | |
| 8.2 | 12 | 10–11 | 1 | |
| 8.1 | 12 | 10–11 | 1 | 1 fewer instruction than PHP 7.4 |
| 7.4 | 13 | 11–12 | 1 |
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
- mb_chr()Compat function to mimic mb_chr().
Used by · 1
- WP_HTML_Decoder::read_character_reference()Attempt to read a character reference at the given location in a given string, depending on the context in which it's found.
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/html-api/class-wp-html-decoder.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.