get_feed_build_date( string $format ): string|false
- Since
- 5.2.0
- Source
wp-includes/feed.php:711
Description
If viewing a comment feed, the time of the most recently modified comment will be returned.
Compatibility
- WordPress
- since 5.2.0
- 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
$formatstring- Date format string to return the time in.
Return value
string|false- The time in requested format, or false on failure.
Performance profile
How much work a call to get_feed_build_date() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Trivial
- Scaling
- Constant
- Instructions
- 20–69
- Plugin surface
- 1 hook
- Called by
- 0
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 69.
Third-party callbacks on 'get_feed_build_date' run inside this call, and their cost is not bounded by anything here.
Nothing in core calls this; the cost is only what you spend yourself.
What it touches
- hookthird-party callbacks
apply_filters()called directly
Further down the call graph this can also reach cache. That is the worst case, several calls deep and usually down an error path, not what a normal call pays.
What one call costs · 16 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost get_feed_build_date() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
empty($wp_query) | 20 | apply_filters() |
!empty($wp_query) && !->have_posts() | 23 | ->have_posts(), apply_filters() |
empty($wp_query) && $datetime !== false | 24 | ->format(), apply_filters() |
!empty($wp_query) && !->have_posts() && $datetime !== false | 27 | ->have_posts(), ->format(), apply_filters() |
empty($wp_query) && $datetime === false | 29 | get_lastpostmodified(), date_create_immutable_from_format(), apply_filters() |
!empty($wp_query) && !->have_posts() && $datetime === false | 32 | ->have_posts(), get_lastpostmodified(), date_create_immutable_from_format(), apply_filters() |
empty($wp_query) | 33 | get_lastpostmodified(), date_create_immutable_from_format(), ->format(), apply_filters() |
!empty($wp_query) && !->have_posts() | 36 | ->have_posts(), get_lastpostmodified(), date_create_immutable_from_format(), ->format(), apply_filters() |
!empty($wp_query) && ->have_posts() | 42–44 | ->have_posts(), wp_list_pluck(), ->is_comment_feed(), max(), date_create_immutable_from_format(), apply_filters() |
!empty($wp_query) && ->have_posts() && $datetime !== false | 46–48 | ->have_posts(), wp_list_pluck(), ->is_comment_feed(), max(), date_create_immutable_from_format(), ->format(), apply_filters() |
!empty($wp_query) && ->have_posts() && $datetime === false | 51–53 | ->have_posts(), wp_list_pluck(), ->is_comment_feed(), max(), date_create_immutable_from_format(), get_lastpostmodified(), date_create_immutable_from_format(), apply_filters() |
!empty($wp_query) && ->have_posts() | 55–57 | ->have_posts(), wp_list_pluck(), ->is_comment_feed(), max(), date_create_immutable_from_format(), get_lastpostmodified(), date_create_immutable_from_format(), ->format(), apply_filters() |
4 further outcomes, up to 69 instructions
!empty($wp_query) && ->have_posts() && ->is_comment_feed() && $wp_query | 56 | ->have_posts(), wp_list_pluck(), ->is_comment_feed(), wp_list_pluck(), array_merge(), max(), date_create_immutable_from_format(), apply_filters() |
!empty($wp_query) && ->have_posts() && ->is_comment_feed() && $wp_query && $datetime !== false | 60 | ->have_posts(), wp_list_pluck(), ->is_comment_feed(), wp_list_pluck(), array_merge(), max(), date_create_immutable_from_format(), ->format(), apply_filters() |
!empty($wp_query) && ->have_posts() && ->is_comment_feed() && $wp_query && $datetime === false | 65 | ->have_posts(), wp_list_pluck(), ->is_comment_feed(), wp_list_pluck(), array_merge(), max(), date_create_immutable_from_format(), get_lastpostmodified(), date_create_immutable_from_format(), apply_filters() |
!empty($wp_query) && ->have_posts() && ->is_comment_feed() && $wp_query | 69 | ->have_posts(), wp_list_pluck(), ->is_comment_feed(), wp_list_pluck(), array_merge(), max(), date_create_immutable_from_format(), get_lastpostmodified(), date_create_immutable_from_format(), ->format(), 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: 69 instructions, 20–69 executed per call, 6 branches. 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 get_feed_build_date() runs, in this order:
- apply_filters( get_feed_build_date )filterline 753 (+42 into the body)
Filters the date the last post or comment in the query was modified.
Uses · 4
- wp_list_pluck()Plucks a certain field out of each object or array in an array.
- get_lastpostmodified()Gets the most recent time that a post on the site was modified.
- apply_filters()Calls the callback functions that have been added to a filter hook.
- DateTimeZone::__construct()
Source code
function get_feed_build_date( $format ) { global $wp_query; $datetime = false; $max_modified_time = false; $utc = new DateTimeZone( 'UTC' ); if ( ! empty( $wp_query ) && $wp_query->have_posts() ) { // Extract the post modified times from the posts. $modified_times = wp_list_pluck( $wp_query->posts, 'post_modified_gmt' ); // If this is a comment feed, check those objects too. if ( $wp_query->is_comment_feed() && $wp_query->comment_count ) { // Extract the comment modified times from the comments. $comment_times = wp_list_pluck( $wp_query->comments, 'comment_date_gmt' ); // Add the comment times to the post times for comparison. $modified_times = array_merge( $modified_times, $comment_times ); } // Determine the maximum modified time. $datetime = date_create_immutable_from_format( 'Y-m-d H:i:s', max( $modified_times ), $utc ); } if ( false === $datetime ) { // Fall back to last time any post was modified or published. $datetime = date_create_immutable_from_format( 'Y-m-d H:i:s', get_lastpostmodified( 'GMT' ), $utc ); } if ( false !== $datetime ) { $max_modified_time = $datetime->format( $format ); } /** * Filters the date the last post or comment in the query was modified. * * @since 5.2.0 * * @param string|false $max_modified_time Date the last post or comment was modified in the query, in UTC. * False on failure. * @param string $format The date format requested in get_feed_build_date(). */ return apply_filters( 'get_feed_build_date', $max_modified_time, $format );}Changelog
Introduced in 5.2.0. 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 6.8.8 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.