wppaste
WordPress

_get_last_post_time( string $timezone, string $field, string $post_type = 'any' ): string|false

Since
3.1.0, 4.4.0
Source
wp-includes/post.php:7854
Gets the timestamp of the last time any post was modified or published.

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

$timezonestring
The timezone for the timestamp. See get_lastpostdate().
for information on accepted values.
$fieldstring
Post field to check. Accepts 'date' or 'modified'.
$post_typestringoptional
The post type to check. Default 'any'.Default: 'any'

Return value

string|false
The timestamp in 'Y-m-d H:i:s' format, or false on failure.

Performance profile

How much work a call to _get_last_post_time() 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

Reaches the database via ->get_var().

Scaling
Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions
7–79

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 118.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
2

2 places in core call this, so the cost is paid more often than your own code shows.

What it touches

  • cacheobject cachewp_cache_get()called directly
  • sqldatabase query->get_var()called directly
  • hookthird-party callbacksapply_filters()one call below _get_last_post_time()

What one call costs · 27 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost _get_last_post_time() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
!$field7none
$field && $post_type === "any" && $date !== false24strtolower(), wp_cache_get()
$field && $post_type !== "any" && $date !== false29strtolower(), sanitize_key(), wp_cache_get()
$field && $date === false33–40strtolower(), wp_cache_get(), sanitize_key()
$field && $date === false38–45strtolower(), wp_cache_get(), sanitize_key(), wp_cache_set()
$field && $post_type !== "any" && $date === false38–45strtolower(), sanitize_key(), wp_cache_get(), sanitize_key()
$field && $post_type === "any" && $date === false43–50strtolower(), wp_cache_get(), get_post_types()
$field && $post_type !== "any" && $date === false43–50strtolower(), sanitize_key(), wp_cache_get(), sanitize_key(), wp_cache_set()
$field && $date === false48–52strtolower(), wp_cache_get(), sanitize_key(), ->get_var()
$field && $post_type === "any" && $date === false48–55strtolower(), wp_cache_get(), get_post_types(), wp_cache_set()
$field && $date === false48–55strtolower(), sanitize_key(), wp_cache_get(), get_post_types()
$field && $date === false53–57strtolower(), wp_cache_get(), sanitize_key(), ->get_var(), wp_cache_set()
15 further outcomes, up to 79 instructions
$field && $date === false53–59strtolower(), wp_cache_get(), sanitize_key(), gmdate(), ->get_var()
$field && $post_type !== "any" && $date === false53–57strtolower(), sanitize_key(), wp_cache_get(), sanitize_key(), ->get_var()
$field && $date === false53–60strtolower(), sanitize_key(), wp_cache_get(), get_post_types(), wp_cache_set()
$field && $post_type === "any" && $date === false58–62strtolower(), wp_cache_get(), get_post_types(), ->get_var()
$field && $date === false58–64strtolower(), wp_cache_get(), sanitize_key(), gmdate(), ->get_var(), wp_cache_set()
$field && $post_type !== "any" && $date === false58–62strtolower(), sanitize_key(), wp_cache_get(), sanitize_key(), ->get_var(), wp_cache_set()
$field && $post_type !== "any" && $date === false58–64strtolower(), sanitize_key(), wp_cache_get(), sanitize_key(), gmdate(), ->get_var()
$field && $post_type === "any" && $date === false63–67strtolower(), wp_cache_get(), get_post_types(), ->get_var(), wp_cache_set()
$field && $post_type === "any" && $date === false63–69strtolower(), wp_cache_get(), get_post_types(), gmdate(), ->get_var()
$field && $date === false63–67strtolower(), sanitize_key(), wp_cache_get(), get_post_types(), ->get_var()
$field && $post_type !== "any" && $date === false63–69strtolower(), sanitize_key(), wp_cache_get(), sanitize_key(), gmdate(), ->get_var(), wp_cache_set()
$field && $post_type === "any" && $date === false68–74strtolower(), wp_cache_get(), get_post_types(), gmdate(), ->get_var(), wp_cache_set()
$field && $date === false68–72strtolower(), sanitize_key(), wp_cache_get(), get_post_types(), ->get_var(), wp_cache_set()
$field && $date === false68–74strtolower(), sanitize_key(), wp_cache_get(), get_post_types(), gmdate(), ->get_var()
$field && $date === false73–79strtolower(), sanitize_key(), wp_cache_get(), get_post_types(), gmdate(), ->get_var(), wp_cache_set()

Across PHP versions

PHPCompiledExecutedBranchesNotes
8.6-dev1187–799
8.51187–799
8.41187–7993 fewer instructions than PHP 8.3
8.31217–829
8.21217–8291 more instruction than PHP 8.1
8.11207–829
7.41207–829

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 · 4

Used by · 2

Source code

View on Trac View on GitHub 

function _get_last_post_time( $timezone, $field, $post_type = 'any' ) {	global $wpdb; 	if ( ! in_array( $field, array( 'date', 'modified' ), true ) ) {		return false;	} 	$timezone = strtolower( $timezone ); 	$key = "lastpost{$field}:$timezone";	if ( 'any' !== $post_type ) {		$key .= ':' . sanitize_key( $post_type );	} 	$date = wp_cache_get( $key, 'timeinfo' );	if ( false !== $date ) {		return $date;	} 	if ( 'any' === $post_type ) {		$post_types = get_post_types( array( 'public' => true ) );		array_walk( $post_types, array( $wpdb, 'escape_by_ref' ) );		$post_types = "'" . implode( "', '", $post_types ) . "'";	} else {		$post_types = "'" . sanitize_key( $post_type ) . "'";	} 	switch ( $timezone ) {		case 'gmt':			$date = $wpdb->get_var( "SELECT post_{$field}_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1" );			break;		case 'blog':			$date = $wpdb->get_var( "SELECT post_{$field} FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1" );			break;		case 'server':			$add_seconds_server = gmdate( 'Z' );			$date               = $wpdb->get_var( "SELECT DATE_ADD(post_{$field}_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1" );			break;	} 	if ( $date ) {		wp_cache_set( $key, $date, 'timeinfo' ); 		return $date;	} 	return false;}

Changelog

Introduced in 3.1.0. Unchanged from 6.7.7 through 7.1.0.

  1. 6.7.7
  2. 6.8.8
  3. 6.9.7
  4. 7.0.4
  5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

4.4.0
The $post_type argument was added.from the docblock
3.1.0
Introduced.from the docblock

About this page

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Generated from the wordpress-develop 7.1.0 tag, from src/wp-includes/post.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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