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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 |
|---|---|
| 743 | |
| 744 | /** |
| 745 | * Filters the default post title initially used in the "Write Post" form. |
| 746 | * |
| 747 | * @since 1.5.0 |
| 748 | * |
| 749 | * @param string $post_title Default post title. |
| 750 | * @param WP_Post $post Post object. |
| 751 | */ |
| 752 | $post->post_title = (string) apply_filters( 'default_title', $post_title, $post ); |
| 753 | |
| 754 | /** |
| 755 | * Filters the default post excerpt initially used in the "Write Post" form. |
| 756 | * |
| 757 | * @since 1.5.0 |
| 758 | * |
| 759 | * @param string $post_excerpt Default post excerpt. |
| 760 | * @param WP_Post $post Post object. |
| 761 | */ |