sanitize_trackback_urls( string $to_ping ): string
- Since
- 3.4.0
- Source
wp-includes/formatting.php:5755
Compatibility
- WordPress
- since 3.4.0
- 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
$to_pingstring- Space or carriage return separated URLs
Return value
string- URLs starting with the http or https protocol, separated by a carriage return.
Performance profile
How much work a call to sanitize_trackback_urls() 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
- Light
- Scaling
- Scales with input
- Instructions
- 24–25
- Plugin surface
- 1 hook
- Called by
- 2
Touches nothing outside its own arguments.
The body loops, so the work grows with what you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 30.
Third-party callbacks on 'sanitize_trackback_urls' run inside this call, and their cost is not bounded by anything here.
2 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- hookthird-party callbacks
apply_filters()called directly - regexregular expression over the whole input
preg_split()called directly
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 sanitize_trackback_urls() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 24–25 | preg_split(), array_map(), apply_filters() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 30 | 24–25 | 3 | |
| 8.5 | 30 | 24–25 | 3 | |
| 8.4 | 30 | 24–25 | 3 | 8 fewer instructions than PHP 8.3 |
| 8.3 | 38 | 29–30 | 3 | |
| 8.2 | 38 | 29–30 | 3 | |
| 8.1 | 38 | 29–30 | 3 | 1 more instruction than PHP 7.4 |
| 7.4 | 37 | 29–30 | 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.
Hooks and filters fired · 1
One hook fires while sanitize_trackback_urls() runs, in this order:
- apply_filters( sanitize_trackback_urls )filterline 5775 (+20 into the body)
Filters a list of trackback URLs following sanitization.
Uses · 1
- apply_filters()Calls the callback functions that have been added to a filter hook.
Used by · 2
- get_to_ping()Retrieves URLs that need to be pinged.
- wp_insert_post()Inserts or update a post.
Source code
function sanitize_trackback_urls( $to_ping ) { $urls_to_ping = preg_split( '/[\r\n\t ]/', trim( $to_ping ), -1, PREG_SPLIT_NO_EMPTY ); foreach ( $urls_to_ping as $k => $url ) { if ( ! preg_match( '#^https?://.#i', $url ) ) { unset( $urls_to_ping[ $k ] ); } } $urls_to_ping = array_map( 'sanitize_url', $urls_to_ping ); $urls_to_ping = implode( "\n", $urls_to_ping ); /** * Filters a list of trackback URLs following sanitization. * * The string returned here consists of a space or carriage return-delimited list * of trackback URLs. * * @since 3.4.0 * * @param string $urls_to_ping Sanitized space or carriage return separated URLs. * @param string $to_ping Space or carriage return separated URLs before sanitization. */ return apply_filters( 'sanitize_trackback_urls', $urls_to_ping, $to_ping );}Changelog
Introduced in 3.4.0. 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 6.9.7 tag, from
src/wp-includes/formatting.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
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