wp-includes/rest-api/endpoints/class-wp-rest-url-details-controller.php:492Retrieves the head element section.
$htmlstringstring private function get_document_head( $html ) { $head_html = $html; // Find the opening `<head>` tag. $head_start = strpos( $html, '<head' ); if ( false === $head_start ) { // Didn't find it. Return the original HTML. return $html; } // Find the closing `</head>` tag. $head_end = strpos( $head_html, '</head>' ); if ( false === $head_end ) { // Didn't find it. Find the opening `<body>` tag. $head_end = strpos( $head_html, '<body' ); // Didn't find it. Return the original HTML. if ( false === $head_end ) { return $html; } } // Extract the HTML from opening tag to the closing tag. Then add the closing tag. $head_html = substr( $head_html, $head_start, $head_end ); $head_html .= '</head>'; return $head_html; }Introduced in 5.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api/endpoints/class-wp-rest-url-details-controller.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.