Remove EXIF data from JPG using PHP

Question

Is there any way to remove the EXIF data from a JPG using PHP? I have heard of PEL, but I\'m hoping there\'s a simpler way. I am uploading images that will be displayed onli

Answer 1

function remove_exif($in, $out)
{
    $buffer_len = 4096;
    $fd_in = fopen($in, 'rb');
    $fd_out = fopen($out, 'wb');
    while (($buffer = fread($fd_in, $buffer_len)))
    {
        //  \xFF\xE1\xHH\xLLExif\x00\x00 - Exif 
        //  \xFF\xE1\xHH\xLLhttp://      - XMP
        //  \xFF\xE2\xHH\xLLICC_PROFILE  - ICC
        //  \xFF\xED\xHH\xLLPhotoshop    - PH
        while (preg_match('/\xFF[\xE1\xE2\xED\xEE](.)(.)(exif|photoshop|http:|icc_profile|adobe)/si', $buffer, $match, PREG_OFFSET_CAPTURE))
        {
            echo "found: '{$match[3][0]}' marker\n";
            $len = ord($match[1][0]) * 256 + ord($match[2][0]);
            echo "length: {$len} bytes\n";
            echo "write: {$match[0][1]} bytes to output file\n";
            fwrite($fd_out, substr($buffer, 0, $match[0][1]));
            $filepos = $match[0][1] + 2 + $len - strlen($buffer);
            fseek($fd_in, $filepos, SEEK_CUR);
            echo "seek to: ".ftell($fd_in)."\n";
            $buffer = fread($fd_in, $buffer_len);
        }
        echo "write: ".strlen($buffer)." bytes to output file\n";
        fwrite($fd_out, $buffer, strlen($buffer));
    }
    fclose($fd_out);
    fclose($fd_in);
}

It is a prototype for a call from a command line.