wp-includes/deprecated.php:3551Callback function for ob_start() to capture all links in the theme.
$contentstringstringfunction preview_theme_ob_filter( $content ) { _deprecated_function( __FUNCTION__, '4.3.0' ); return $content;}Introduced in 2.6.0. 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.