wp-includes/class-wp-xmlrpc-server.php:354Escapes string or array of strings for database.
$datastring|arraystring|void public function escape( &$data ) { if ( ! is_array( $data ) ) { return wp_slash( $data ); } foreach ( $data as &$v ) { if ( is_array( $v ) ) { $this->escape( $v ); } elseif ( ! is_object( $v ) ) { $v = wp_slash( $v ); } } }Introduced in 1.5.2. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
string|void to string|null.verified against sourcesrc/wp-includes/class-wp-xmlrpc-server.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.