Online PHP editor | output for Nl99G

<?php set_time_limit(5); $pic1="crackcha.jpg"; $pic2="crackcha_bw.jpg"; $cookie="WC4_SID=226191-7-hrfgW0Qp400r8xRF"; $url="http://www.wechall.net/challenge/crackcha/index.php"; $ch = curl_init(); curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); curl_setopt($ch, CURLOPT_COOKIE, $cookie); curl_setopt($ch, CURLOPT_URL, $url); $res=curl_exec ($ch); curl_close($ch); //echo $res,"<br>"; $busca1="/dbimg/crackcha/"; $busca2=' alt="Crackcha"'; $donde1=strpos($res,$busca1)+16; $donde2=strpos($res,$busca2,$donde1)-1; $urlpic="http://www.wechall.net/dbimg/crackcha/".substr($res,$donde1,$donde2-$donde1); //echo $urlpic; save_image($urlpic,$pic1); $im1=imagecreatefromjpeg($pic1); $ancho=imagesx($im1); $alto=imagesy($im1); $im2=imagecreatetruecolor($ancho,$alto); $b=imagecolorallocate($im2,0,0,0);//black $w=imagecolorallocate($im2,255,255,255);//white $treshold=90; //convert to black & white for($x=0;$x<$ancho;$x++){ for($y=0;$y<$alto;$y++){ $rgb = imagecolorat($im1, $x, $y); $r = ($rgb >> 16) & 0xFF; if($r < $treshold){ imagesetpixel($im2,$x,$y,$b); }else{ imagesetpixel($im2,$x,$y,$w); } } } header('Content-Type: image/jpeg'); imagejpeg($im2); imagedestroy($im1); imagedestroy($im2); function cleardots($im,$x,$y){ global $im1; global $x; global $y; $values=array("","","","","","","",""); $count=0; } function save_image($inPath,$outPath){ //Download images from remote server $in= fopen($inPath, "rb"); $out= fopen($outPath, "wb"); while ($chunk = fread($in,8192)) { fwrite($out, $chunk, 8192); } fclose($in); fclose($out); } ?>