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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 |
|---|---|
| 132 | * |
| 133 | * The filter is only applied on the front end. |
| 134 | * |
| 135 | * @since 2.8.0 |
| 136 | * |
| 137 | * @param string $prepend Text displayed before the post title. |
| 138 | * Default 'Protected: %s'. |
| 139 | * @param WP_Post $post Current post object. |
| 140 | */ |
| 141 | $protected_title_format = apply_filters( 'protected_title_format', $prepend, $post ); |
| 142 | |
| 143 | $post_title = sprintf( $protected_title_format, $post_title ); |
| 144 | } elseif ( isset( $post->post_status ) && 'private' === $post->post_status ) { |
| 145 | |
| 146 | /* translators: %s: Private post title. */ |
| 147 | $prepend = __( 'Private: %s' ); |
| 148 | |
| 149 | /** |
| 150 | * Filters the text prepended to the post title of private posts. |