wp-includes/class-wp-rewrite.php:800Adds or updates existing rewrite tags (e.g. %postname%).
$tagstring$regexstring$querystring public function add_rewrite_tag( $tag, $regex, $query ) { $position = array_search( $tag, $this->rewritecode, true ); if ( false !== $position && null !== $position ) { $this->rewritereplace[ $position ] = $regex; $this->queryreplace[ $position ] = $query; } else { $this->rewritecode[] = $tag; $this->rewritereplace[] = $regex; $this->queryreplace[] = $query; } }Introduced in 1.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-rewrite.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.