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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 |
|---|---|
| 7949 | * This may occur multiple times per page load and registered |
| 7950 | * actions must be performant. |
| 7951 | * |
| 7952 | * @since 6.3.0 |
| 7953 | * |
| 7954 | * @param string $group The cache group name. |
| 7955 | * @param int $time The new last changed time. |
| 7956 | * @param int|false $previous_time The previous last changed time. False if not previously set. |
| 7957 | */ |
| 7958 | do_action( 'wp_cache_set_last_changed', $group, $time, $previous_time ); |
| 7959 | |
| 7960 | return $time; |
| 7961 | } |
| 7962 | |
| 7963 | /** |
| 7964 | * Sends an email to the old site admin email address when the site admin email address changes. |
| 7965 | * |
| 7966 | * @since 4.9.0 |
| 7967 | * |