PHP回应jpeg图像失败，但将相同的图像写入文件工作伟大。为什么？ [英] PHP echoing jpeg image fails, but writing same image to file works great. Why?

问题描述

我有一个函数在PHP中调用curl来检索图像。当我打印到一个文件，并在浏览器中检查它，图像看起来不错。当我使用curl结果的echo作为我的PHP脚本的返回值时，浏览器显示破碎图像图标（参见该图标的示例： http://www.artifacting.com/blog/wp-content/uploads/2007/01/error_icon.gif ）。

I have a function in PHP that calls curl to retrieve an image. When I print that to a file and examine it in the browser, the image looks great. When I use "echo" of the curl results as the return value from my PHP script, the browser shows the broken-image icon (see an example of that icon: http://www.artifacting.com/blog/wp-content/uploads/2007/01/error_icon.gif).

$ch = curl_init(); 
$options = array(
  CURLOPT_CONNECTTIMEOUT => 120,
  CURLOPT_TIMEOUT        => 120,
  CURLOPT_HTTP_VERSION   => CURL_HTTP_VERSION_1_1,
  CURLOPT_FRESH_CONNECT  => 1,
  CURLOPT_HEADER         => 0,
  CURLOPT_USERAGENT      => "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)",
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTPPROXYTUNNEL => 1,
  CURLOPT_POST            => 1,
  CURLOPT_RETURNTRANSFER  => 1,
  CURLOPT_BINARYTRANSFER  => 1,
);

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt_array($ch, $options);
curl_setopt($ch, CURLOPT_POSTFIELDS, $param_list);

// The http response code is 200, and the body length is 50kb.  
$body = curl_exec($curl_params);

// This produces a file containing an image that looks good when viewed in a browser.
$bodyFile = @fopen("img.jpg", "w");
fprintf($bodyFile, "%s", $body. "\n");
fclose($bodyFile);

// This does not render in the browser.  Instead I see the broken image icon.
$contentType = "image/jpeg";
header('Content-type: ' . $contentType);  
echo $body;

任何想法？帮助！

推荐答案

原来，我有另一个PHP文件，写出一个额外的换行符。在？>行后面的文件末尾有一个换行符。

It turned out that I had another PHP file that was writing out an extra newline character. There was a newline at the end of that file after the "?>" line.

这篇关于PHP回应jpeg图像失败，但将相同的图像写入文件工作伟大。为什么？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！