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Home Backend Development PHP Tutorial Linux 下 PHP 无法 echo 图片

Linux 下 PHP 无法 echo 图片

Jun 06, 2016 pm 08:18 PM
linux php

这串代码,在 linux 环境下无法显示图片

<code>$img_url = $_GET['img'];
$content = file_get_contents($img_url);
header('Content-Type: image/jpeg; charset=UTF-8');
echo $content;
</code>
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linux 环境的访问地址 demo (存在问题)
mac 环境的访问地址 demo (正常)
win 关机了就不贴了 (正常)

我在这串代码之前添加过 error_reporting(E_ALL);ini_set("display_errors","On");die;未发现错误,
检查了 linux 环境下的 allow-url-fopenon,并且可以 print_r 出来,内容相同如下:

<code>����JFIF��;CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90 ��C     ��C      ��j�"��  ���}!1AQa"q2���#B��R��$3br� %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz��������������������������������������������������������������������������� ���w!1AQaq"2�B����  #3R�br� $4�%�&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz��������������������������������������������������������������������������?�����2���}x����bi��f(�IQ߆���]/�?</code>
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这串字符没太多意义,截取了头部一段贴了上来。

同时添加一个 phpinfo 供大家查看

回复内容:

这串代码,在 linux 环境下无法显示图片

<code>$img_url = $_GET['img'];
$content = file_get_contents($img_url);
header('Content-Type: image/jpeg; charset=UTF-8');
echo $content;
</code>
Copy after login
Copy after login

linux 环境的访问地址 demo (存在问题)
mac 环境的访问地址 demo (正常)
win 关机了就不贴了 (正常)

我在这串代码之前添加过 error_reporting(E_ALL);ini_set("display_errors","On");die;未发现错误,
检查了 linux 环境下的 allow-url-fopenon,并且可以 print_r 出来,内容相同如下:

<code>����JFIF��;CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90 ��C     ��C      ��j�"��  ���}!1AQa"q2���#B��R��$3br� %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz��������������������������������������������������������������������������� ���w!1AQaq"2�B����  #3R�br� $4�%�&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz��������������������������������������������������������������������������?�����2���}x����bi��f(�IQ߆���]/�?</code>
Copy after login
Copy after login

这串字符没太多意义,截取了头部一段贴了上来。

同时添加一个 phpinfo 供大家查看

这个问题于昨夜三点解决,在代码输出之前添加 ob_clean 即可,在 Thinkphp 的调试模式下会有意外输出,但是这个输出是什么尚未找到,而且这个意外输出只有 linux 下才会有,怀疑是框架问题和系统配置之间有什么问题。

正常来说, 应该可以输出图片的。 windows 下,我测试时没有问题。 thinkphp 可能某些应用到ob 缓存了,清理下吧,不然直接在浏览器输出 二进制流可能有问题。

少扩展
freetype,jpegsrc,libpng装上试试

header('Content-Type: image/jpeg; charset=UTF-8');
这行去掉charset=UTF-8
header('Content-Type: image/jpeg');

看了一下,lz的相应头里是 Content-Type: image/jpg,应该是 Content-Type: image/jpeg

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