What should I do if the pdf image generated by php is not displayed?

In the process of using PHP to generate PDF files, sometimes you will encounter the problem that PDF images are not displayed. This problem is relatively common in the process of generating PDF files using PHP, but it is also easy to solve. Here are a few solutions briefly introduced for you.

1. Use ImageMagick or GD library to regenerate the image

If you are using PHP's ImageMagick or GD library to generate the image, you can try to regenerate an image. Sometimes, the image format or size may be incompatible, which prevents it from being loaded correctly by the PDF file. It is recommended that you convert the image to JPEG or PNG format and resize it.

2. Convert the image to base64 encoding

Another solution is to convert the image to base64 encoding and embed it directly into the PDF file. This method ensures that images are loaded correctly and also reduces dependence on external files. The following is a sample code:

$data = file_get_contents('image.jpg');
$base64 = base64_encode($data);

$html = '<img src="data:image/jpeg;base64,&#39; . $base64 . &#39;" />';

// 输出PDF文件
$pdf = new TCPDF();
$pdf->AddPage();
$pdf->writeHTML($html, true, false, true, false, '');
$pdf->Output();

3. Adjust the configuration of the TCPDF library

If the above two methods cannot solve the problem, then you can try to adjust some configuration items of the TCPDF library to ensure Images load correctly. Specifically, you can try to turn on the following configuration items:

define('K_PATH_IMAGES', '/path/to/tcpdf/images/');    // 设置TCPDF的图片位置
define('K_IMAGE_NO_SCALE', 1);                         // 禁用图片缩放
define('K_CELL_HEIGHT_RATIO', 1.25);                   // 调整单元格高度

After you adjust the above configurations and retest, you should be able to successfully solve the problem of PDF images not being displayed.

The above are some simple methods to solve the problem that the PDF images generated by PHP are not displayed. If you encounter this problem, please try the above methods in order and you should be able to find the best solution.

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