wp_title_rss( string $deprecated = '–' )
- Since
- 2.2.0, 4.4.0
- Source
wp-includes/feed.php:129
Compatibility
- WordPress
- since 4.4.0
- 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
$deprecatedstringoptional- Unused.Default:
'–'
Performance profile
How much work a call to wp_title_rss() 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
- 12–24
- Plugin surface
- 1 hook
- 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 24.
Third-party callbacks on 'wp_title_rss' run inside this call, and their cost is not bounded by anything here.
Nothing in core calls this; the cost is only what you spend yourself.
What it touches
- hookthird-party callbacks
apply_filters()called directly
Further down the call graph this can also reach option, query, cache, serialize and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.
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_title_rss() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
$deprecated === "–" | 12 | get_wp_title_rss(), apply_filters() |
$deprecated !== "–" | 24 | __(), sprintf(), _deprecated_argument(), get_wp_title_rss(), apply_filters() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 24 instructions, 12–24 executed per call, 1 branch. 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.
Hooks and filters fired · 1
One hook fires while wp_title_rss() runs, in this order:
- apply_filters( wp_title_rss )filterline 146 (+17 into the body)
Filters the blog title for display of the feed title.
Uses · 4
- _deprecated_argument()Marks a function argument as deprecated and inform when it has been used.
- __()Retrieves the translation of $text.
- apply_filters()Calls the callback functions that have been added to a filter hook.
- get_wp_title_rss()Retrieves the blog title for the feed title.
Source code
function wp_title_rss( $deprecated = '–' ) { if ( '–' !== $deprecated ) { /* translators: %s: 'document_title_separator' filter name. */ _deprecated_argument( __FUNCTION__, '4.4.0', sprintf( __( 'Use the %s filter instead.' ), '<code>document_title_separator</code>' ) ); } /** * Filters the blog title for display of the feed title. * * @since 2.2.0 * @since 4.4.0 The `$sep` parameter was deprecated and renamed to `$deprecated`. * * @see get_wp_title_rss() * * @param string $wp_title_rss The current blog title. * @param string $deprecated Unused. */ echo apply_filters( 'wp_title_rss', get_wp_title_rss(), $deprecated );}Changelog
Introduced in 2.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$sep parameter was deprecated and renamed to $deprecated.from the docblockAbout this page
- Parsed data
- Generated from the wordpress-develop 6.9.7 tag, from
src/wp-includes/feed.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.