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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 1403 | // Latest content is in autosave |
| 1404 | $nonce = wp_create_nonce( 'post_preview_' . $post->ID ); |
| 1405 | $preview_link = add_query_arg( array( 'preview_id' => $post->ID, 'preview_nonce' => $nonce ), $preview_link ); |
| 1406 | } |
| 1407 | } else { |
| 1408 | $preview_link = ''; |
| 1409 | } |
| 1410 | |
| 1411 | /** This filter is documented in wp-admin/includes/meta-boxes.php */ |
| 1412 | $preview_link = apply_filters( 'preview_post_link', $preview_link ); |
| 1413 | |
| 1414 | /** |
| 1415 | * Filter whether to allow the post lock to be overridden. |
| 1416 | * |
| 1417 | * Returning a falsey value to the filter will disable the ability |
| 1418 | * to override the post lock. |
| 1419 | * |
| 1420 | * @since 3.6.0 |
| 1421 | * |
| Line | Code |
| 1605 | $query_args['preview_nonce'] = wp_create_nonce( 'post_preview_' . $post->ID ); |
| 1606 | |
| 1607 | if ( isset( $_POST['post_format'] ) ) |
| 1608 | $query_args['post_format'] = empty( $_POST['post_format'] ) ? 'standard' : sanitize_key( $_POST['post_format'] ); |
| 1609 | } |
| 1610 | |
| 1611 | $url = add_query_arg( $query_args, get_permalink( $post->ID ) ); |
| 1612 | |
| 1613 | /** This filter is documented in wp-admin/includes/meta-boxes.php */ |
| 1614 | return apply_filters( 'preview_post_link', $url ); |
| 1615 | } |
| 1616 | |
| 1617 | /** |
| 1618 | * Save a post submitted with XHR |
| 1619 | * |
| 1620 | * Intended for use with heartbeat and autosave.js |
| 1621 | * |
| 1622 | * @since 3.9 |
| 1623 | * |