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<?php $_REQUEST=array(); $_REQUEST["username"]="''"." or username=\""; $_REQUEST["password"]="''"." or password=\""; echo "SELECT * from users where username=\"".$_REQUEST["username"]."\" and password=\"".$_REQUEST["password"]."\""; ?>
Output for 4.3.0 - 7.1.0
SELECT * from users where username="'' or username="" and password="'' or password=""