today i learned how to parse pdf form fields with php . Same like in html forms pdf may also have some form fields .And i want to share it with all . Hope you will like this little function to fetch pdf form fields .

public function pdfparser($pdfname) {
        $pdfname = str_replace(" ", "", $pdfname);
            
        $ext = pathinfo($pdfname,PATHINFO_EXTENSION);
        if($ext == "")
        {
            $pdfname = $pdfname.".pdf";
        }
        
        $pdffile = 'path to pdf' . $pdfname;
        exec("pdftk " . $pdffile . " dump_data_fields 2>&1", $output, $retval);
        if (is_array($output) && !empty($output)) { 
            if (strpos($output[0], 'Error') !== false) {
                $pdf = 'path of pdf file' . $pdfname;
                $pdfunsafe = 'path to decrypted/unsafe-' . $pdfname;
                exec("qpdf --decrypt " . $pdf . " " . $pdfunsafe);
                $pdffile = 'mew unsafe/unsafe-' . $pdfname;
                exec("pdftk " . $pdffile . " dump_data_fields 2>&1", $outputunsafe, $retval);
                
                if(is_dir($pdf))
                {
                    unlink($pdf);
                    rename($pdfunsafe, $pdf);
                }                                

                return $outputunsafe;
            }
        }
        //if (strpos($output[0],'Error') !== false){ echo  "error to run" ; }   // this is the option to handle error 
        return $output;
    }

Now we have a function pdfparser (‘your pdf file path’) so you can call it anywhere .
You need to install pdftk to parse the pdf and may be qpdf to decrypt the pdf file if needed.

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