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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.
| Line | Code |
|---|---|
| 8068 | * This may occur multiple times per page load and registered |
| 8069 | * actions must be performant. |
| 8070 | * |
| 8071 | * @since 6.3.0 |
| 8072 | * |
| 8073 | * @param string $group The cache group name. |
| 8074 | * @param string $time The new last changed time (msec sec). |
| 8075 | * @param string|false $previous_time The previous last changed time. False if not previously set. |
| 8076 | */ |
| 8077 | do_action( 'wp_cache_set_last_changed', $group, $time, $previous_time ); |
| 8078 | |
| 8079 | return $time; |
| 8080 | } |
| 8081 | |
| 8082 | /** |
| 8083 | * Sends an email to the old site admin email address when the site admin email address changes. |
| 8084 | * |
| 8085 | * @since 4.9.0 |
| 8086 | * |