PHP script to convert PDF to CSV (pdftotext)

<?php
/**
 * convert pdf file to csv.
 *
 * Shell command to convert pdf to text file:
 * pdftotext -layout file.pdf
 *
 * The resulting file will be parsed and converted to a csv file
 *
 * Example rows of interest (footer and header lines will be ignored):
 * 98458995   21.02.2016            10.06.2016/DOE/JOHN                                      160,96
 * The line has a trailing linefeed !
 *
 */
function printHeader() {
    echo <<< HEADER
<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>PDF2CSV-Converter</title>
</head>
<body>
    <h1>PDF file upload</h1>
    <form enctype="multipart/form-data" method="POST">
        <input type="file" name="pdf" /><br />
        <input type="submit" value="Upload now" />
    </form>

HEADER;
}


function printFooter() {
    echo <<< FOOTER
</body>
</html>
FOOTER;
}


printHeader();
$baseName = "file";
$pdfFile = $baseName.'.pdf';
$inFile = $baseName.'.txt';
$outFile = $baseName.'.csv';
@unlink($pdfFile);
@unlink($inFile);
@unlink($outFile);

if (array_key_exists('pdf', $_FILES)) {
    $ok = move_uploaded_file($_FILES['pdf']['tmp_name'], $pdfFile);
    if ($ok) {
        // convert pdf to txt
        $output = shell_exec("pdftotext -layout $pdfFile $inFile");
        // use a pattern to identify tabular data of interest
        $pattern = "/^(\d{8})\s{2,}(\d{2}\.\d{2}\.\d{4})\s{2,}/"; // e.g. "98458995   21.02.2016       "
        $content = file($inFile);
        $fh = fopen($outFile, "w");
        foreach($content as $line) {
            $match = array();
            if (preg_match($pattern, $line, $match)) {
                // split cols - in this case multiple spaces
                $cols = preg_split("/\s{2,}/", $line);
                // write line to file
                $csv = sprintf("%s;%s;%s;%s", $cols[0], $cols[1], $cols[2], $cols[3]);
                fputs($fh, $csv);
            }
        }
        fclose($fh);
        echo '<hr /><a href="'.$outFile.'">Download '.$outFile.'</a><hr />';
    }//if ok
}

printFooter();