How to open garbled characters when php doc generates pdf files

In the process of using PHP to generate PDF files, sometimes garbled characters appear when opening the file. This may be caused by the fact that the PDF file contains non-standard character sets and the opening program cannot recognize these character sets.

The solution to this problem is very simple, we only need to specify the character set during the process of generating PDF files. The following are the specific steps:

1. Open the php.ini file and find the following two lines of code:

; Default charset for default html header output.
default_charset = "UTF-8"

; Always populate the $HTTP_RAW_POST_DATA variable. PHP's
; default behavior is to disable this feature because it is
; a potential security risk. If you need to enable it, specify
; 1 instead of 0.
;always_populate_raw_post_data = -1

If these two lines of code are commented out, you need to uncomment and specify the corresponding value. For example, if the character set you want to generate is GBK, the code should be modified as follows:

; Default charset for default html header output.
default_charset = "GBK"

; Always populate the $HTTP_RAW_POST_DATA variable. PHP's
; default behavior is to disable this feature because it is
; a potential security risk. If you need to enable it, specify
; 1 instead of 0.
;always_populate_raw_post_data = -1

2. In your PHP code, use the following code to specify the character set:

header('Content-Type: text/html; charset= GBK');

3. In the code that generates the PDF file, use the following code to specify the character set:

$dompdf = new Dompdf\Dompdf();
$dompdf->set_option('defaultMediaType', 'print');
$dompdf->set_option('enable_html5_parser', true);
$dompdf->loadHtml(mb_convert_encoding($html, 'HTML -ENTITIES', 'GBK'));
$dompdf->render();

Where, $html is the HTML code you want to generate, use the mb_convert_encoding function to convert the character set into HTML entities .

Through the above operations, we can avoid garbled characters when generating PDF files. It should be noted that the choice of character set should be based on the specific situation. Using an appropriate character set can ensure that there will be no problems when the file is opened.

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