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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 3937 | */ |
| 3938 | function get_lastpostmodified($timezone = 'server') { |
| 3939 | global $wpdb; |
| 3940 | |
| 3941 | $add_seconds_server = date('Z'); |
| 3942 | $timezone = strtolower( $timezone ); |
| 3943 | |
| 3944 | $lastpostmodified = wp_cache_get( "lastpostmodified:$timezone", 'timeinfo' ); |
| 3945 | if ( $lastpostmodified ) |
| 3946 | return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone ); |
| 3947 | |
| 3948 | switch ( strtolower($timezone) ) { |
| 3949 | case 'gmt': |
| 3950 | $lastpostmodified = $wpdb->get_var("SELECT post_modified_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' ORDER BY post_modified_gmt DESC LIMIT 1"); |
| 3951 | break; |
| 3952 | case 'blog': |
| 3953 | $lastpostmodified = $wpdb->get_var("SELECT post_modified FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' ORDER BY post_modified_gmt DESC LIMIT 1"); |
| 3954 | break; |
| 3955 | case 'server': |
| Line | Code |
| 3958 | } |
| 3959 | |
| 3960 | $lastpostdate = get_lastpostdate($timezone); |
| 3961 | if ( $lastpostdate > $lastpostmodified ) |
| 3962 | $lastpostmodified = $lastpostdate; |
| 3963 | |
| 3964 | if ( $lastpostmodified ) |
| 3965 | wp_cache_set( "lastpostmodified:$timezone", $lastpostmodified, 'timeinfo' ); |
| 3966 | |
| 3967 | return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone ); |
| 3968 | } |
| 3969 | |
| 3970 | /** |
| 3971 | * Updates posts in cache. |
| 3972 | * |
| 3973 | * @usedby update_page_cache() Aliased by this function. |
| 3974 | * |
| 3975 | * @package WordPress |
| 3976 | * @subpackage Cache |