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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 |
|---|---|
| 48 | /** |
| 49 | * Filter the URI of a post preview in the post submit box. |
| 50 | * |
| 51 | * @since 2.0.5 |
| 52 | * @since 4.0.0 $post parameter was added. |
| 53 | * |
| 54 | * @param string $preview_link URI the user will be directed to for a post preview. |
| 55 | * @param WP_Post $post Post object. |
| 56 | */ |
| 57 | $preview_link = esc_url( apply_filters( 'preview_post_link', add_query_arg( 'preview', 'true', $preview_link ), $post ) ); |
| 58 | $preview_button = __( 'Preview' ); |
| 59 | } |
| 60 | ?> |
| 61 | <a class="preview button" href="<?php echo $preview_link; ?>" target="wp-preview-<?php echo (int) $post->ID; ?>" id="post-preview"><?php echo $preview_button; ?></a> |
| 62 | <input type="hidden" name="wp-preview" id="wp-preview" value="" /> |
| 63 | </div> |
| 64 | <?php endif; // public post type ?> |
| 65 | <div class="clear"></div> |
| 66 | </div><!-- #minor-publishing-actions --> |