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run code in 200+ php & hhvm versions
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<?php <html><body><h1>1KB Forum</h1><?mysql_connect('localhost','username','********');mysql_select_db('d');extract($_REQUEST);$v=intval($v);$i=0;$q='mysql_query';$f='mysql_fetch_row';$n='mysql_num_rows';$x='<input type="';$s="SELECT*FROM";$t='CREATE TABLE IF NOT EXISTS t(i INT AUTO_INCREMENT,a INT,b TEXT,KEY(i))';$h='htmlspecialchars';$q($t);$q(str_replace('t','p',$t));$l=' ORDER BY';$o='';$u='INSERT INTO';$c="b)VALUES('";if($b){if(!$v)$q("$u t($c$e')");$v=max($v,mysql_insert_id());$q("$u p(a,$c$v','$b')");}if($v){$t=$q("$s p WHERE a=$v$l i");echo'<a href="f.php">Back</a>';for(;$i<$n($t);++$i){$r=$f($t);echo'<hr/>'.nl2br($h($r[2]));}}else{$t=$q("$s t$l-i");for(;$i<$n($t);++$i){$r=$f($t);echo'<a href="f.php?v='.$r[0].'">'.$h($r[2]).'</a><br/>';}$o='Title:'.$x.'text"name="e"/><br/>';}echo'<hr/>Post:<form action="f.php"method="post">'.$x.'hidden"name="v"value="'."$v\"/>$o<textarea name=\"b\"></textarea>$x";?>submit"name="w"value="Post"/></form></body></htm ?>
Output for 5.3.0 - 5.5.10
Parse error: syntax error, unexpected '<' in /in/uR8eI on line 3
Process exited with code 255.