(PHP 7 >= 7.4.0)
SQLite3Stmt::getSQL — Get the SQL of the statement
$expanded = FALSE
  ] ) : string
   Retrieves the SQL of the prepared statement. If expanded
   is FALSE, the unmodified SQL is retrieved. If expanded
   is TRUE, all query parameters are replaced with their bound values, or with
   an SQL NULL, if not already bound.
  
expanded
      Whether to retrieve the expanded SQL. Passing TRUE is only supported as
      of libsqlite 3.14.
     
   Returns the SQL of the prepared statement,  o FALSE en caso de error.
  
   If expanded is TRUE, but the libsqlite version is less
   than 3.14, an error of level E_WARNING or an Exception
   is issued, according to SQLite3::enableExceptions().
  
Ejemplo #1 Inspecting the expanded SQL
<?php
$db = new SQLite3(':memory:');
$stmt = $db->prepare("SELECT :a, ?, :c");
$stmt->bindValue(':a', 'foo');
$answer = 42;
$stmt->bindParam(2, $answer);
var_dump($stmt->getSQL(true));
?>
El resultado del ejemplo sería algo similar a:
string(24) "SELECT 'foo', '42', NULL"