wp_kses_hair_parse( string $attr ): array|false
- Since
- 4.2.3
- Source
wp-includes/kses.php:1596
Description
Does not modify input. May return "evil" output.
In case of unexpected input, returns false instead of stripping things.
Based on wp_kses_hair() but does not return a multi-dimensional array.
Compatibility
- WordPress
- since 4.2.3
- 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- Attribute list from HTML element to closing HTML element tag.
Return value
array|false- List of attributes found in $attr. Returns false on failure.
Performance profile
How much work a call to wp_kses_hair_parse() 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
- 4–13
- 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 15.
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 it touches
- regexregular expression over the whole input
preg_match_all()called directly
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 wp_kses_hair_parse() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 4–7 | none |
$attr !== "" | 13 | preg_match_all() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 15 | 4–13 | 2 | |
| 8.5 | 15 | 4–13 | 2 | |
| 8.4 | 15 | 4–13 | 2 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 18 | 4–16 | 2 | |
| 8.2 | 18 | 4–16 | 2 | |
| 8.1 | 18 | 4–16 | 2 | |
| 7.4 | 18 | 4–16 | 2 |
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.
Used by · 1
- wp_kses_attr_parse()Finds all attributes of an HTML element.
Source code
function wp_kses_hair_parse( $attr ) { if ( '' === $attr ) { return array(); } $regex = '(?: [_a-zA-Z][-_a-zA-Z0-9:.]* # Attribute name. | \[\[?[^\[\]]+\]\]? # Shortcode in the name position implies unfiltered_html. ) (?: # Attribute value. \s*=\s* # All values begin with "=". (?: "[^"]*" # Double-quoted. | \'[^\']*\' # Single-quoted. | [^\s"\']+ # Non-quoted. (?:\s|$) # Must have a space. ) | (?:\s|$) # If attribute has no value, space is required. ) \s* # Trailing space is optional except as mentioned above. '; /* * Although it is possible to reduce this procedure to a single regexp, * we must run that regexp twice to get exactly the expected result. * * Note: do NOT remove the `x` modifiers as they are essential for the above regex! */ $validation = "/^($regex)+$/x"; $extraction = "/$regex/x"; if ( 1 === preg_match( $validation, $attr ) ) { preg_match_all( $extraction, $attr, $attrarr ); return $attrarr[0]; } else { return false; }}Changelog
Introduced in 4.2.3. 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 6.8.8 tag, from
src/wp-includes/kses.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.