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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 |
|---|---|
| 763 | |
| 764 | /** |
| 765 | * Filters the default post title initially used in the "Write Post" form. |
| 766 | * |
| 767 | * @since 1.5.0 |
| 768 | * |
| 769 | * @param string $post_title Default post title. |
| 770 | * @param WP_Post $post Post object. |
| 771 | */ |
| 772 | $post->post_title = (string) apply_filters( 'default_title', $post_title, $post ); |
| 773 | |
| 774 | /** |
| 775 | * Filters the default post excerpt initially used in the "Write Post" form. |
| 776 | * |
| 777 | * @since 1.5.0 |
| 778 | * |
| 779 | * @param string $post_excerpt Default post excerpt. |
| 780 | * @param WP_Post $post Post object. |
| 781 | */ |