* @author Peter Waller * * @link http://aidanlister.com/2004/04/viewing-binary-data-as-a-hexdump-in-php/ * * @param string $data The string to be dumped * @param bool $htmloutput Set to false for non-HTML output * @param bool $uppercase Set to true for uppercase hex * @param bool $return Set to true to return the dump * * @return string */ function hexdump($data, $htmloutput = true, $uppercase = false, $return = false) { // Init $hexi = ''; $ascii = ''; $dump = ($htmloutput === true) ? '

' : '';
    $offset = 0;
    $len    = strlen($data);

    // Upper or lower case hexadecimal
    $x = ($uppercase === false) ? 'x' : 'X';

    // Iterate string
    for ($i = $j = 0; $i < $len; $i++) {
        // Convert to hexidecimal
        $hexi .= sprintf("%02$x ", ord($data[$i]));

        // Replace non-viewable bytes with '.'
        if (ord($data[$i]) >= 32) {
            $ascii .= ($htmloutput === true) ?
                            htmlentities($data[$i]) :
                            $data[$i];
        } else {
            $ascii .= '.';
        }

        // Add extra column spacing
        if ($j === 7) {
            $hexi  .= ' ';
            $ascii .= ' ';
        }

        // Add row
        if (++$j === 16 || $i === $len - 1) {
            // Join the hexi / ascii output
            $dump .= sprintf("%04$x  %-49s  %s", $offset, $hexi, $ascii);

            // Reset vars
            $hexi   = $ascii = '';
            $offset += 16;
            $j      = 0;

            // Add newline
            if ($i !== $len - 1) {
                $dump .= "\n";
            }
        }
    }

    // Finish dump
    $dump .= $htmloutput === true ?
                '

' : ''; $dump .= "\n"; // Output method if ($return === false) { echo $dump; } else { return $dump; } return null; }