_wp_post_revision_field_(field) filter-hook . WP 3.6.0

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

Usage

add_filter( '_wp_post_revision_field_(field)', 'filter_function_name_9964', 10, 4 );
function filter_function_name_9964( $revision_field, $field, $compare_from, $context ){
	// filter...

	return $revision_field;
}

$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'.

Where the hook is called

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

$content_to = apply_filters( "_wp_post_revision_field_{$field}", $compare_to->$field, $field, $compare_to, 'to' );

Where in WP core the hook is used WordPress