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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 |
|---|---|
| 49 | // Add default title if title field is empty |
| 50 | if ( $compare_from && empty( $compare_from->post_title ) ) |
| 51 | $compare_from->post_title = __( '(no title)' ); |
| 52 | if ( empty( $compare_to->post_title ) ) |
| 53 | $compare_to->post_title = __( '(no title)' ); |
| 54 | |
| 55 | $return = array(); |
| 56 | |
| 57 | foreach ( _wp_post_revision_fields() as $field => $name ) { |
| 58 | $content_from = $compare_from ? apply_filters( "_wp_post_revision_field_$field", $compare_from->$field, $field, $compare_from, 'from' ) : ''; |
| 59 | $content_to = apply_filters( "_wp_post_revision_field_$field", $compare_to->$field, $field, $compare_to, 'to' ); |
| 60 | |
| 61 | $diff = wp_text_diff( $content_from, $content_to, array( 'show_split_view' => true ) ); |
| 62 | |
| 63 | if ( ! $diff && 'post_title' === $field ) { |
| 64 | // It's a better user experience to still show the Title, even if it didn't change. |
| 65 | // No, you didn't see this. |
| 66 | $diff = '<table class="diff"><colgroup><col class="content diffsplit left"><col class="content diffsplit middle"><col class="content diffsplit right"></colgroup><tbody><tr>'; |
| 67 | $diff .= '<td>' . esc_html( $compare_from->post_title ) . '</td><td></td><td>' . esc_html( $compare_to->post_title ) . '</td>'; |
| 68 | $diff .= '</tr></tbody>'; |