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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 |
|---|---|
| 570 | |
| 571 | /** |
| 572 | * Filter the default post title initially used in the "Write Post" form. |
| 573 | * |
| 574 | * @since 1.5.0 |
| 575 | * |
| 576 | * @param string $post_title Default post title. |
| 577 | * @param WP_Post $post Post object. |
| 578 | */ |
| 579 | $post->post_title = apply_filters( 'default_title', $post_title, $post ); |
| 580 | |
| 581 | /** |
| 582 | * Filter the default post excerpt initially used in the "Write Post" form. |
| 583 | * |
| 584 | * @since 1.5.0 |
| 585 | * |
| 586 | * @param string $post_excerpt Default post excerpt. |
| 587 | * @param WP_Post $post Post object. |
| 588 | */ |