An interesting example of php code auditing

It seems that it was an accidental example of the ecshop payment vulnerability last year. Share Interesting code auditing examples
Looks like the ecshop payment vulnerability last year
The occasional example is nice. Share

The code is as follows:

$ A = addslashes ($ _ GET ['A']);
$ B = addslashes ($ _ GET ['B']);
Print_r ($ .'
');
Print_r ($ B .'
');
Print_r (str_replace ($ a, '', $ B ));
// Seay
?>

The escape backslash (\) causes an error in single quotes. Cause injection.

Source: http://www.moonsec.com/