sql injection

Hello
it looks that the escaping pattern is converting ' to ''
but if \ be before them, the first quote will be escaped and the second one exists.
can it be injected by this way?

No, this code is used in fortune 500 companies. It has been through numerous security audits.

Actually the code needs to be corrected for slash. What happens if there is a slash at the end of a value for a text datatype field?

Consider the following example:
<?php
include("mysql.class.php");
$db = new MySQL(true, "test", "localhost", "root", "");
$values["name"] = MySQL::SQLValue("nikunj\\");
$result = $db->InsertRow("contacts", $values);
if (! $result) {
$db->Kill();
} else {
echo "The new record's ID is: " . $db->GetLastInsertID() . "\n<br />\n";
$db->SelectRows("contacts", $values);
echo $db->GetHTML();
}
?>

This will output the following error:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''nikunj\')' at line 1 (#1064)

Because when this PHP script is run, the query tried for execution becomes like this:
INSERT INTO `products` (`name`) VALUES ('nikunj\');

The slash after the name 'nikunj' is considered as an escape character for the second/closing single quote; and MySQL "thinks" that the query is not-proper/incomplete because the string is not ended/closed.

The query should be constructed like this:
INSERT INTO `products` (`name`) VALUES ('nikunj\\');

So, to resolve this issue, a small change is needed in the line # 1594 (in "SQLValue()" function) as following:
$return_value = "'" . str_replace(array("\\", "'"), array("\\\\", "''"), $value) . "'";

Now it will replace slash with 2 shalhes and single-quote with 2 signle-quotes.