PHP ascii table from 2D array

asciitable.php

    function generateAsciiTable($data)
    {
        // Generate row widths
        $rowWidths = [];

        foreach ($data as $row) {
            foreach ($row as $index => $cell) {
                if (!isset($rowWidths[$index])) {
                    $rowWidths[$index] = strlen($cell) + 2;
                } else {
                    if ($rowWidths[$index] < strlen($cell) + 2) {
                        $rowWidths[$index] = strlen($cell) + 2;
                    }
                }
            }
        }

        // Row, go through again and repad all the things!
        foreach ($data as $rindex => $row) {
            foreach ($row as $cindex => $cell) {
                $data[$rindex][$cindex] = str_pad(
                    ' ' .
                    $data[$rindex][$cindex],
                    $rowWidths[$cindex],
                    ' ',
                    STR_PAD_RIGHT
                );
            }
        }

        // Container for table text
        $tableText = "";

        // Now, output the row lines with some magic.
        $headerLineLength = strlen(implode("|", $data[0]));

        foreach ($data as $index => $row) {
            $line = implode("|", $row);
            // if header line
            if ($index == 0) {
                $tableText .= "\n|" . str_pad("", $headerLineLength, "-") . "|\n";
                $tableText .= "|" . $line . "|\n";
                $tableText .= "|" . str_pad("", $headerLineLength, "-") . "|\n";
            } else {
                $tableText .= "|" . $line . "|\n";
            }
        }

        $tableText .= "|" . str_pad("", $headerLineLength, "-") . "|\n";
        return $tableText;
    }