PHP - 文件不会下载到服务器

>我一直遇到一些问题，每当我尝试获取将项目图像下载到服务器的请求时，它都不起作用。它似乎让物品与物品一起显示企鹅，但这只是因为图像在那里。图像将下载到名为 paper/images/%size%/%itemid% 的路径。我不确定权限是否正确，或者它只是显示一个空白页面，如下所示。http://api.frosty.us/avatar/?id=1。正如你在这里看到的，项目在这里 http://api.frosty.us/avatar/paper/image/88/9.png 它得到用户的颜色，头部，颈部，身体，旗帜，照片，面部等。然后它像洋娃娃一样建立它。

这是我的代码

<?php

function downloadPapers($itemId, $paperSizes = array(60, 88, 120, 600)){
    foreach($paperSizes as $paperSize){
        $avatarPaperUri = sprintf('paper/image/%d/%d.png', $paperSize, $itemId);
        $avatarPaperUrl = 'http://mobcdn.clubpenguin.com/game/items/images/' . $avatarPaperUri;
        $paperCurl = curl_init($avatarPaperUrl);
        curl_setopt($paperCurl, CURLOPT_FRESH_CONNECT, true);
        curl_setopt($paperCurl, CURLOPT_RETURNTRANSFER, true);
        $imageData = curl_exec($paperCurl);
        $statusCode = curl_getinfo($paperCurl, CURLINFO_HTTP_CODE);
        curl_close($paperCurl);
        if($statusCode == 200){
            file_put_contents($avatarPaperUri, $imageData);
        } else {
            return false;
        }
    }
}
function cachePaper($itemId, $paperSize){
    $downloadStatus = downloadPapers($itemId);
    if($downloadStatus !== false){
        $paperImage = imagecreatefrompng(sprintf('paper/image/%d/%d.png', $paperSize, $itemId));
        return $paperImage;
    } else {
        return false;
    }
}
function returnPaperResource($itemId, $paperSize = 120){
    $avatarUnbiasUri = sprintf('paper/image/%d/%d.png', $paperSize, $itemId);
    $paperImage = file_exists($avatarUnbiasUri) ? imagecreatefrompng($avatarUnbiasUri) : cachePaper($itemId, $paperSize);
    return $paperImage;
}
$validPaperSizes = array(60, 88, 120, 600);
$defaultPaperSize = 120;
if(isset($_GET['id']) === false){
    die();
}
$playerSwid = $_GET['id'];
if(isset($_GET['size']) === false){
    $avatarPaperSize = 120;
} else {
    $avatarPaperSize = $_GET['size'];
}
if(is_dir("paper/image/60/") === false){
    mkdir("paper/image/60/", 0755, true);
}
if(is_dir("paper/image/88/") === false){
    mkdir("paper/image/88/", 0755, true);
}
if(is_dir("paper/image/120/") === false){
    mkdir("paper/image/120/", 0755, true);
}
if(is_dir("paper/image/600/") === false){
    mkdir("paper/image/600/", 0755, true);
}
if(!in_array($avatarPaperSize, $validPaperSizes)){
    $avatarPaperSize = $defaultPaperSize;
}
require 'configlinkhere';
try {
    $database = new PDO('mysql:host=' . $config['db_host'] . ';dbname=' . $config['db_name'], $config['db_user'], $config['db_pass']);
} catch(PDOException $pdoException){
    echo $pdoException->getMessage(), die();
}
$playerQuery = 'SELECT ID FROM `users` WHERE ID = :ID';
$playerStatement = $database->prepare($playerQuery);
$playerStatement->bindValue(':ID', $playerSwid);
$playerStatement->execute();
$rowCount = $playerStatement->rowCount();
$playerStatement->closeCursor();
if($rowCount < 1){
    echo 'Player doesn''t exist', die();
}
$clothingQuery = 'SELECT head, face, neck, body, hand, feet, photo, flag, colour FROM `users` WHERE ID = :ID';
$clothingStatement = $database->prepare($clothingQuery);
$clothingStatement->bindValue(':ID', $playerSwid);
$clothingStatement->execute();
$playerClothing = $clothingStatement->fetch(PDO::FETCH_ASSOC);
$clothingStatement->closeCursor();
header('Content-type: image/png');
$colorResource = returnPaperResource($playerClothing['colour'], $avatarPaperSize);
unset($playerClothing['colour']);
if($playerClothing['photo'] != 0){
    $imageResource = returnPaperResource($playerClothing['photo'], $avatarPaperSize);
    if($imageResource === false) {
        $imageResource = $colorResource;
    } else {
        imagecopyresampled($imageResource, $colorResource, 0, 0, 0, 0, imagesx($imageResource), imagesy($imageResource), imagesx($colorResource), imagesy($colorResource));
    }
} else {
    $imageResource = $colorResource;
}
unset($playerClothing['photo']);
foreach($playerClothing as $clothingPart => $itemId){
    if($itemId != 0){
        $clothingResource = returnPaperResource($itemId, $avatarPaperSize);
        if($clothingResource !== false) {
            imagecopyresampled($imageResource, $clothingResource, 0, 0, 0, 0, imagesx($imageResource), imagesy($imageResource), imagesx($clothingResource), imagesy($clothingResource));
        }
    }
}
imagealphablending($imageResource, false);
imagesavealpha($imageResource, true);
imagepng($imageResource);
imagedestroy($imageResource);
unset($database);
?>