php DomPDF：图像不可读或为空
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DomPDF: Image not readable or empty
提问by David P. P.
For some reason, DomPDF won't render an image included in the html that is being parsed:
出于某种原因，DomPDF 不会渲染包含在正在解析的 html 中的图像：
However, the image is rendered on the page when it is returned as html:
但是，当图像作为 html 返回时，图像会呈现在页面上：
I've looked at these issues and have make sure that DOMPDF_ENABLE_REMOTE is set to true and verified file permissions:
dompdf image not real image not readable or empty
Image error in DOMPDF for ZF2
我查看了这些问题，并确保 DOMPDF_ENABLE_REMOTE 设置为 true 并验证文件权限：
dompdf image not real image not readable or empty
Image error in DOMPDF for ZF2
Are there any other things that I should be checking for?
还有什么我应该检查的东西吗？
回答by David P. P.
Following helped me like charm, at least localy, and even with
跟随帮助我喜欢魅力，至少在本地，甚至
def("DOMPDF_ENABLE_REMOTE", false);
The solution is to change the image SRC to the absolute path on the server, like this:
解决办法是把图片src改成服务器上的绝对路径，像这样：
<img src="/var/www/domain/images/myimage.jpg" />
All of the following worked for me:
以下所有内容都对我有用：
<img src="<?php echo $_SERVER["DOCUMENT_ROOT"].'/placeholder.jpg';?>"/>
<img src="<?php echo $_SERVER["DOCUMENT_ROOT"].'\placeholder.jpg';?>"/>
<img src="<?php echo $_SERVER["DOCUMENT_ROOT"].'./placeholder.jpg';?>"/>
$_SERVER["DOCUMENT_ROOT"] is C:/wamp/www/ZendSkeletonApplication/public
$_SERVER["DOCUMENT_ROOT"] 是 C:/wamp/www/ZendSkeletonApplication/public
回答by Patrice Flao
Ok I had the same problem with image using :
好的，我在使用图像时遇到了同样的问题：
<img id="logo" src="/images/flags/fr.png" width="50" alt="Logo">
But if I add a . before /images, without changing anything in dompdf_config.custom.inc, it works
但是如果我添加一个 . 在 /images 之前，无需更改 dompdf_config.custom.inc 中的任何内容，它就可以工作
<img id="logo" src="./images/flags/fr.png" width="50" alt="Logo">
Hope it helps
希望能帮助到你
回答by Jon
As there was another answer that suggests enabling the remote option in module.config.phpand I can't yet add comments, I thought it would be best to answer that this file does not exist in newer versions of DomPDF.
由于有另一个答案建议启用远程选项module.config.php并且我还不能添加评论，我认为最好回答这个文件在较新版本的 DomPDF 中不存在。
If you need to include remotely stored images in a newer version you have to pass it as an option to the constructor:
如果您需要在较新版本中包含远程存储的图像，则必须将其作为选项传递给构造函数：
$dompdf = new Dompdf(array('enable_remote' => true));
This fixed the issue I had.
这解决了我遇到的问题。
回答by André DLC
Now (May 2018) the correct way is :
现在（2018 年 5 月）正确的方法是：
$options = new Options();
$options->set('isRemoteEnabled',true);
$dompdf = new Dompdf( $options );
回答by Owen Davey
回答by BlackPearl
You can use base64 encoded image
您可以使用 base64 编码的图像
<img src="{{'data:image/png;base64,' . base64_encode(file_get_contents(@$image))}}" alt="image" >
回答by Nasser Hekmati
I solve this problem by using external CSS's full path. This one worked on my linux ubuntu server :
我通过使用外部 CSS 的完整路径解决了这个问题。这个在我的 linux ubuntu 服务器上工作：
<link href="{{ public_path('css/style.css') }}" />
<link href="{{ public_path('css/style.css') }}" />
<img src="{{ public_path('images/image.jpg') }}" />
<img src="{{ public_path('images/image.jpg') }}" />
and work on image.
并在图像上工作。
回答by egorychmaster
In path :
在路径中：
vendor/dino/dompdf-module/config/module.config.php
vendor/dino/dompdf-module/config/module.config.php
change settings
更改设置
enable_remote' => false,
enable_remote' => 假，
то true.
是真的。
回答by Japo Domingo
For our use case we had to convert all the images on the page to base64 since the pdf should be usable offline. Our code lives inside a controller class but you can modify that to your needs.
对于我们的用例，我们必须将页面上的所有图像转换为 base64，因为 pdf 应该可以离线使用。我们的代码位于控制器类中，但您可以根据需要对其进行修改。
Here's the code:
这是代码：
/**
* Convert images to Base64 so it's included in the PDF.
*
* @param $html Full html render of the page.
*/
public function convertReportImagesToURI($html): string
{
$doc = new DOMDocument();
libxml_use_internal_errors(true);
$doc->loadHTML($html);
$tags = $doc->getElementsByTagName('img');
$imgArr = array();
// Iterate over all image tags.
foreach ($tags as $tag) {
// Get the src attribute.
$imgSrc = $tag->getAttribute('src');
// Convert to base64.
$base64src = self::getImageDataURI($imgSrc);
$tag->setAttribute('src', $base64src);
}
return $doc->saveHTML();
}
/**
* This does the actual encoding.
*/
public static function getImageDataURI($image, $mime = ''): string
{
// Director::absoluteURL('/') gets the base url of the site.
// We had to remove the leading slash of the image hence the use of substr.
// If your images have absolute urls you will need to modify this.
$imageLocation = Director::absoluteURL('/') . substr($image, 1);
// Get the image location. remove leading slash on image url.
return 'data:' . self::get_image_mime_type($imageLocation) . ';base64,' . base64_encode(file_get_contents($imageLocation));
}
/**
* https://stackoverflow.com/a/45054843
* @param $image_path
* @return string
*/
public static function get_image_mime_type($image_path): string
{
$mimes = array(
IMAGETYPE_GIF => "image/gif",
IMAGETYPE_JPEG => "image/jpg",
IMAGETYPE_PNG => "image/png",
IMAGETYPE_SWF => "image/swf",
IMAGETYPE_PSD => "image/psd",
IMAGETYPE_BMP => "image/bmp",
IMAGETYPE_TIFF_II => "image/tiff",
IMAGETYPE_TIFF_MM => "image/tiff",
IMAGETYPE_JPC => "image/jpc",
IMAGETYPE_JP2 => "image/jp2",
IMAGETYPE_JPX => "image/jpx",
IMAGETYPE_JB2 => "image/jb2",
IMAGETYPE_SWC => "image/swc",
IMAGETYPE_IFF => "image/iff",
IMAGETYPE_WBMP => "image/wbmp",
IMAGETYPE_XBM => "image/xbm",
IMAGETYPE_ICO => "image/ico");
if (($image_type = exif_imagetype($image_path))
&& (array_key_exists($image_type, $mimes))) {
return $mimes[$image_type];
} else {
return '';
}
}
