wp-includes/deprecated.php:3397Formerly used internally to tidy up the search terms.
$tstringstringfunction _search_terms_tidy( $t ) { _deprecated_function( __FUNCTION__, '3.7.0' ); return trim( $t, "\"'\n\r " );}Introduced in 2.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.