wp-includes/class-wpdb.php:1358Escapes content by reference for insertion into the database, for security.
$datastring public function escape_by_ref( &$data ) { if ( ! is_float( $data ) ) { $data = $this->_real_escape( $data ); } }Introduced in 2.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wpdb.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.