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$input = "\\'"; # these two backslashes will print a single backslash 
+in the SQL, but, as I will add one backslash before the single quote,
+ the result there will be just the same as you can see here.

select username, password from users where sid='$input';

5' or 1='1

5\\' or 1=\\'1

...where sid='    5\\' or 1=\\'1        ';