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run code in 150+ php & hhvm versions
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<?php $_REQUEST=array(); $_REQUEST["username"]=""; $_REQUEST["password"]=""; //echo "SELECT * from users where username=\"".$_REQUEST["username"]."\" and password=\"".$_REQUEST["password"]."\""; echo "SELECT * from users where username=\"".$_REQUEST["username"]."\" or username=\""."\" and password=\"".$_REQUEST["password"]."\" or password=\""."\""; ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
SELECT * from users where username="" or username="" and password="" or password=""