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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 |
|---|---|
| 5917 | $to_ping = preg_split( '/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY ); |
| 5918 | |
| 5919 | /** |
| 5920 | * Filters the list of URLs yet to ping for the given post. |
| 5921 | * |
| 5922 | * @since 2.0.0 |
| 5923 | * |
| 5924 | * @param string[] $to_ping List of URLs yet to ping. |
| 5925 | */ |
| 5926 | return apply_filters( 'get_to_ping', $to_ping ); |
| 5927 | } |
| 5928 | |
| 5929 | /** |
| 5930 | * Does trackbacks for a list of URLs. |
| 5931 | * |
| 5932 | * @since 1.0.0 |
| 5933 | * |
| 5934 | * @param string $tb_list Comma separated list of URLs. |
| 5935 | * @param int $post_id Post ID. |