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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 |
---|---|
4825 | $to_ping = preg_split( '/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY ); |
4826 |
|
4827 | /** |
4828 | * Filters the list of URLs yet to ping for the given post. |
4829 | * |
4830 | * @since 2.0.0 |
4831 | * |
4832 | * @param string[] $to_ping List of URLs yet to ping. |
4833 | */ |
4834 | return apply_filters( 'get_to_ping', $to_ping ); |
4835 | } |
4836 |
|
4837 | /** |
4838 | * Do trackbacks for a list of URLs. |
4839 | * |
4840 | * @since 1.0.0 |
4841 | * |
4842 | * @param string $tb_list Comma separated list of URLs. |
4843 | * @param int $post_id Post ID. |