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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 |
|---|---|
| 2285 | * Filters the default media display states for items in the Media list table. |
| 2286 | * |
| 2287 | * @since 3.2.0 |
| 2288 | * @since 4.8.0 Added the `$post` parameter. |
| 2289 | * |
| 2290 | * @param string[] $media_states An array of media states. Default 'Header Image', |
| 2291 | * 'Background Image', 'Site Icon', 'Logo'. |
| 2292 | * @param WP_Post $post The current attachment object. |
| 2293 | */ |
| 2294 | $media_states = apply_filters( 'display_media_states', $media_states, $post ); |
| 2295 | |
| 2296 | if ( ! empty( $media_states ) ) { |
| 2297 | $state_count = count( $media_states ); |
| 2298 | $i = 0; |
| 2299 | |
| 2300 | echo ' — '; |
| 2301 | |
| 2302 | foreach ( $media_states as $state ) { |
| 2303 | $sep = ( ++$i === $state_count ) ? '' : ', '; |