wp-includes/functions.php:7154Sends a HTTP header to limit rendering of pages to same origin iframes.
function send_frame_options_header() { if ( ! headers_sent() ) { header( 'X-Frame-Options: SAMEORIGIN' ); header( "Content-Security-Policy: frame-ancestors 'self';" ); }}Introduced in 3.1.3. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.