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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 |
|---|---|
| 2062 | /** |
| 2063 | * Filters the default post display states used in the posts list table. |
| 2064 | * |
| 2065 | * @since 2.8.0 |
| 2066 | * @since 3.6.0 Added the `$post` parameter. |
| 2067 | * |
| 2068 | * @param string[] $post_states An array of post display states. |
| 2069 | * @param WP_Post $post The current post object. |
| 2070 | */ |
| 2071 | $post_states = apply_filters( 'display_post_states', $post_states, $post ); |
| 2072 | |
| 2073 | if ( ! empty( $post_states ) ) { |
| 2074 | $state_count = count( $post_states ); |
| 2075 | $i = 0; |
| 2076 | echo ' — '; |
| 2077 | foreach ( $post_states as $state ) { |
| 2078 | ++$i; |
| 2079 | ( $i == $state_count ) ? $sep = '' : $sep = ', '; |
| 2080 | echo "<span class='post-state'>$state$sep</span>"; |