get_lastcommentmodified( string $timezone = 'server' ): string|false
- Since
- 1.5.0, 4.7.0
- Source
wp-includes/comment.php:410
Compatibility
- WordPress
- since 4.7.0
- 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
$timezonestringoptional- Which timezone to use in reference to 'gmt', 'blog', or 'server' locations.Default:
'server'
Return value
string|false- Last comment modified date on success, false on failure.
Performance profile
How much work a call to get_lastcommentmodified() 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
- Heavy
- Scaling
- Constant
- Instructions
- 15–44
- Plugin surface
- None
- Called by
- 1
Reaches the database via ->get_var().
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 65.
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
- cacheobject cache
wp_cache_get()called directly - sqldatabase query
->get_var()called directly
What one call costs · 6 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost get_lastcommentmodified() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 15–24 | strtolower(), wp_cache_get() |
$comment_modified_date === false | 22–29 | strtolower(), wp_cache_get(), wp_cache_set() |
$comment_modified_date === false | 26–30 | strtolower(), wp_cache_get(), ->get_var() |
$comment_modified_date === false | 31–35 | strtolower(), wp_cache_get(), ->get_var(), wp_cache_set() |
$comment_modified_date === false | 33–39 | strtolower(), wp_cache_get(), gmdate(), ->prepare(), ->get_var() |
$comment_modified_date === false | 38–44 | strtolower(), wp_cache_get(), gmdate(), ->prepare(), ->get_var(), wp_cache_set() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 65 | 15–44 | 6 | |
| 8.5 | 65 | 15–44 | 6 | |
| 8.4 | 65 | 15–44 | 6 | |
| 8.3 | 65 | 15–44 | 6 | |
| 8.2 | 65 | 15–44 | 6 | 1 more instruction than PHP 8.1 |
| 8.1 | 64 | 15–44 | 6 | |
| 7.4 | 64 | 15–44 | 6 |
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 · 2
- wp_cache_get()Retrieves the cache contents from the cache by key and group.
- wp_cache_set()Saves the data to the cache.
Used by · 1
- WP::send_headers()Sends additional HTTP headers for caching, content type, etc.
Source code
function get_lastcommentmodified( $timezone = 'server' ) { global $wpdb; $timezone = strtolower( $timezone ); $key = "lastcommentmodified:$timezone"; $comment_modified_date = wp_cache_get( $key, 'timeinfo' ); if ( false !== $comment_modified_date ) { return $comment_modified_date; } switch ( $timezone ) { case 'gmt': $comment_modified_date = $wpdb->get_var( "SELECT comment_date_gmt FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1" ); break; case 'blog': $comment_modified_date = $wpdb->get_var( "SELECT comment_date FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1" ); break; case 'server': $add_seconds_server = gmdate( 'Z' ); $comment_modified_date = $wpdb->get_var( $wpdb->prepare( "SELECT DATE_ADD(comment_date_gmt, INTERVAL %s SECOND) FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1", $add_seconds_server ) ); break; } if ( $comment_modified_date ) { wp_cache_set( $key, $comment_modified_date, 'timeinfo' ); return $comment_modified_date; } return false;}Changelog
Introduced in 1.5.0. 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/comment.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.