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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 |
|---|---|
| 1691 | |
| 1692 | /** |
| 1693 | * Filter the default media display states for items in the Media list table. |
| 1694 | * |
| 1695 | * @since 3.2.0 |
| 1696 | * |
| 1697 | * @param array $media_states An array of media states. Default 'Header Image', |
| 1698 | * 'Background Image'. |
| 1699 | */ |
| 1700 | $media_states = apply_filters( 'display_media_states', $media_states ); |
| 1701 | |
| 1702 | if ( ! empty( $media_states ) ) { |
| 1703 | $state_count = count( $media_states ); |
| 1704 | $i = 0; |
| 1705 | echo ' - '; |
| 1706 | foreach ( $media_states as $state ) { |
| 1707 | ++$i; |
| 1708 | ( $i == $state_count ) ? $sep = '' : $sep = ', '; |
| 1709 | echo "<span class='post-state'>$state$sep</span>"; |