Contextually filter a post revision field.

The dynamic portion of the hook name, $field, corresponds to a name of a field of the revision object.

Possible hook names include:

• _wp_post_revision_field_post_title
• _wp_post_revision_field_post_content
• _wp_post_revision_field_post_excerpt

$revision_field string

The current revision field to compare to or from.

$field string

The current revision field.

$compare_from WP_Post

The revision post object to compare to or from.

$context string

The context of whether the current revision is the old or the new one. Values are 'to' or 'from'.

File: wp-admin/includes/revision.php. View all references

$content_from = $compare_from ? apply_filters( "_wp_post_revision_field_{$field}", $compare_from->$field, $field, $compare_from, 'from' ) : '';