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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 |
|---|---|
| 709 | |
| 710 | /** |
| 711 | * Filters the default post title initially used in the "Write Post" form. |
| 712 | * |
| 713 | * @since 1.5.0 |
| 714 | * |
| 715 | * @param string $post_title Default post title. |
| 716 | * @param WP_Post $post Post object. |
| 717 | */ |
| 718 | $post->post_title = (string) apply_filters( 'default_title', $post_title, $post ); |
| 719 | |
| 720 | /** |
| 721 | * Filters the default post excerpt initially used in the "Write Post" form. |
| 722 | * |
| 723 | * @since 1.5.0 |
| 724 | * |
| 725 | * @param string $post_excerpt Default post excerpt. |
| 726 | * @param WP_Post $post Post object. |
| 727 | */ |