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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 |
|---|---|
| 2141 | * Filters the default media display states for items in the Media list table. |
| 2142 | * |
| 2143 | * @since 3.2.0 |
| 2144 | * @since 4.8.0 Added the `$post` parameter. |
| 2145 | * |
| 2146 | * @param string[] $media_states An array of media states. Default 'Header Image', |
| 2147 | * 'Background Image', 'Site Icon', 'Logo'. |
| 2148 | * @param WP_Post $post The current attachment object. |
| 2149 | */ |
| 2150 | $media_states = apply_filters( 'display_media_states', $media_states, $post ); |
| 2151 | |
| 2152 | if ( ! empty( $media_states ) ) { |
| 2153 | $state_count = count( $media_states ); |
| 2154 | $i = 0; |
| 2155 | echo ' — '; |
| 2156 | foreach ( $media_states as $state ) { |
| 2157 | ++$i; |
| 2158 | ( $i == $state_count ) ? $sep = '' : $sep = ', '; |
| 2159 | echo "<span class='post-state'>$state$sep</span>"; |