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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.
| Line | Code |
|---|---|
| 93 | if ( $revisions = wp_get_post_revisions( $post_id ) ) { |
| 94 | // grab the last revision, but not an autosave |
| 95 | foreach ( $revisions as $revision ) { |
| 96 | if ( false !== strpos( $revision->post_name, "{$revision->post_parent}-revision" ) ) { |
| 97 | $last_revision = $revision; |
| 98 | break; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', true, $last_revision, $post ) ) { |
| 103 | $post_has_changed = false; |
| 104 | |
| 105 | foreach ( array_keys( _wp_post_revision_fields() ) as $field ) { |
| 106 | if ( normalize_whitespace( $post->$field ) != normalize_whitespace( $last_revision->$field ) ) { |
| 107 | $post_has_changed = true; |
| 108 | break; |
| 109 | } |
| 110 | } |
| 111 | //don't save revision if post unchanged |