写入图像文件空白页时，Fwrite产生0个字节

I am very new to php. I would like to know how I can modify this code so that the image file is written and not blank. Thank-you for your assistance. The first code is file wget.php and the second is report_snapshot_upload.php. For some reason which I have unable to identify the file is being written but with 0 bytes. I apologize for my ignorance, as I have only been coding for a few months now. Does anybody know from the two files that I have listed, what I am missing?

  <?php
$type = 'image/'.$_GET['type'];
$url = urldecode($_GET['url']);
/*if (filter_var($url, FILTER_VALIDATE_URL) === FALSE){
    die('Not a valid URL');
}else{*/

//}
if(strpos($url,".jpeg") != false || strpos($url,".jpg") != false || strpos($url,".png") != false || strpos($url,".gif") != false || (strpos($url,"facebook") != false && strpos($url,".php") == false && strpos($url,".asp") == false && strpos($url,".aspx") == false && strpos($url,".cgi") == false)){
    $file = file_get_contents($url);
}else{
     die('Not a valid URL');
}

header('Content-Type:'.$type);
echo $file;
?>

<?php
//this file is called by index.swf when a report is made
$siteId  = $_GET["siteId"];//user's id as sent by the siteID var in avc_settings.xxx
$type = $_GET["type"];//snapshot type (text-chat snapshot or camera snapshot);

//make the folder if it's missing
if(!file_exists("report_snaps")){

    $oldmask = umask(0);
mkdir("report_snaps", 0777);
umask($oldmask);




}

//check for malicious $type values
if($type!="TEXT.jpg" && $type !="CAM.jpg"){
    die("save=failed");
}

$image = fopen("report_snaps/".$siteId."_".$type,"wb");
if ($image){
    if (fwrite($image, file_get_contents("php://input"))){
        fclose($image);

        echo "save=ok";
    }else{
        echo "save=failed";
    }
}else{
    echo "save=failed";
}

?>