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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 3 times in this file.
| Line | Code |
|---|---|
| 155 | <span class="alignright"><?php printf( __('Newer: %s'), wp_post_revision_title( $right_revision ) ); ?></span> |
| 156 | </th> |
| 157 | </tr> |
| 158 | <?php endif; |
| 159 | |
| 160 | // use get_post_to_edit filters? |
| 161 | $identical = true; |
| 162 | foreach ( _wp_post_revision_fields() as $field => $field_title ) : |
| 163 | if ( 'diff' == $action ) { |
| 164 | $left_content = apply_filters( "_wp_post_revision_field_$field", $left_revision->$field, $field ); |
| 165 | $right_content = apply_filters( "_wp_post_revision_field_$field", $right_revision->$field, $field ); |
| 166 | if ( !$content = wp_text_diff( $left_content, $right_content ) ) |
| 167 | continue; // There is no difference between left and right |
| 168 | $identical = false; |
| 169 | } else { |
| 170 | add_filter( "_wp_post_revision_field_$field", 'htmlspecialchars' ); |
| 171 | $content = apply_filters( "_wp_post_revision_field_$field", $revision->$field, $field ); |
| 172 | } |
| 173 | ?> |
| 174 | |
| 175 | <tr id="revision-field-<?php echo $field; ?>"> |
| 176 | <th scope="row"><?php echo wp_specialchars( $field_title ); ?></th> |
| 177 | <td><div class="pre"><?php echo $content; ?></div></td> |
| 178 | </tr> |
| 179 | |
| 180 | <?php |