Description:
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question sign in sql comment perceived as a parameter.

Test script:
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<?php

$dbhost ='localhost';
// username and password to log onto db server
$dbuser ='root';
$dbpass ='test';
// name of database
$dbname='test';
//Charset
$sqlchar='utf8';
 
$db = new PDO ( 'mysql:host=' . $dbhost . ';dbname=' . $dbname, $dbuser, $dbpass);

$sth = $db->prepare("SELECT * from users where id = :user /* find user by id script ?\ */");
$sth->execute(array(':user' => 1));
$sth->fetch();

Expected result:
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Exception not thrown

Actual result:
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Exception is thrown