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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 |
|---|---|
| 1924 | /** |
| 1925 | * Filters the default post display states used in the posts list table. |
| 1926 | * |
| 1927 | * @since 2.8.0 |
| 1928 | * @since 3.6.0 Added the `$post` parameter. |
| 1929 | * |
| 1930 | * @param array $post_states An array of post display states. |
| 1931 | * @param WP_Post $post The current post object. |
| 1932 | */ |
| 1933 | $post_states = apply_filters( 'display_post_states', $post_states, $post ); |
| 1934 | |
| 1935 | if ( ! empty($post_states) ) { |
| 1936 | $state_count = count($post_states); |
| 1937 | $i = 0; |
| 1938 | echo ' — '; |
| 1939 | foreach ( $post_states as $state ) { |
| 1940 | ++$i; |
| 1941 | ( $i == $state_count ) ? $sep = '' : $sep = ', '; |
| 1942 | echo "<span class='post-state'>$state$sep</span>"; |