该程序是不用GD库可以生成当前时间的PNG格式图象，给人大开眼界，很有参考价值. teaman整理

<?php
       
    function set_4pixel($r, $g, $b, $x, $y)
    {
    global $sx, $sy, $pixels;

    $ofs = 3 * ($sx * $y + $x);
    $pixels[$ofs] = chr($r);
    $pixels[$ofs + 1] = chr($g);
    $pixels[$ofs + 2] = chr($b);
    $pixels[$ofs + 3] = chr($r);
    $pixels[$ofs + 4] = chr($g);
    $pixels[$ofs + 5] = chr($b);
    $ofs += 3 * $sx;
    $pixels[$ofs] = chr($r);
    $pixels[$ofs + 1] = chr($g);
    $pixels[$ofs + 2] = chr($b);
    $pixels[$ofs + 3] = chr($r);
    $pixels[$ofs + 4] = chr($g);
    $pixels[$ofs + 5] = chr($b);
    }
    //生成数字图象的函数    
    function draw2digits($x, $y, $number)
    {
    draw_digit($x, $y, (int) ($number / 10));
    draw_digit($x + 11, $y, $number % 10);
    }
        
    function draw_digit($x, $y, $digit)
    {
    global $sx, $sy, $pixels, $digits, $lines;
            
    $digit = $digits[$digit];
    $m = 8;
    for ($b = 1, $i = 0; $i < 7; $i++, $b *= 2) {
        if (($b & $digit) == $b) {
        $j = $i * 4;
        $x0 = $lines[$j] * $m + $x;
        $y0 = $lines[$j + 1] * $m + $y;
        $x1 = $lines[$j + 2] * $m + $x;
        $y1 = $lines[$j + 3] * $m + $y;
        if ($x0 == $x1) {
            $ofs = 3 * ($sx * $y0 + $x0);
            for ($h = $y0; $h <= $y1; $h++, $ofs += 3 * $sx) {
            $pixels[$ofs] = chr(0);
            $pixels[$ofs + 1] = chr(0);
            $pixels[$ofs + 2] = chr(0);
            }
        } else {
            $ofs = 3 * ($sx * $y0 + $x0);
            for ($w = $x0; $w <= $x1; $w++) {
            $pixels[$ofs++] = chr(0);
            $pixels[$ofs++] = chr(0);
            $pixels[$ofs++] = chr(0);
            }
        }
        }
    }
    }
        
    //将文字加入到图象中 
    function add_chunk($type)
    {
    global $result, $data, $chunk, $crc_table;

    // chunk :为层
    // length: 4 字节: 用来计算 chunk 
    // chunk type: 4 字节
    // chunk data: length bytes
    // CRC: 4 字节:  循环冗余码校验
        
    // copy data and create CRC checksum
    $len = strlen($data);
    $chunk = pack("c*", ($len >> 24) & 255,
        ($len >> 16) & 255,
        ($len >> 8) & 255,
        $len & 255);
    $chunk .= $type;
    $chunk .= $data;

    // calculate a CRC checksum with the bytes chunk[4..len-1]
    $z = 16777215;
    $z |= 255 << 24;
    $c = $z;
    for ($n = 4; $n < strlen($chunk); $n++) {
        $c8 = ($c >> 8) & 0xffffff;
        $c = $crc_table[($c ^ ord($chunk][$n])) & 0xff] ^ $c8;
    }
    $crc = $c ^ $z;

    $chunk .= chr(($crc >> 24) & 255);
    $chunk .= chr(($crc >> 16) & 255);
    $chunk .= chr(($crc >> 8) & 255);
    $chunk .= chr($crc & 255);

    // 将结果加到$result中
    $result .= $chunk;
    }

    //主程序

    $sx = 80;
    $sy = 21;
    $pixels = "";
            
    // 填充
    for ($h = 0; $h < $sy; $h++) {
    for ($w = 0; $w < $sx; $w++) {
        $r = 100 / $sx * $w + 155;
        $g = 100 / $sy * $h + 155;
        $b = 255 - (100 / ($sx + $sy) * ($w + $h));
        $pixels .= chr($r);
        $pixels .= chr($g);
        $pixels .= chr($b);
    }
    }
        
    $date = getdate();
    $s = $date["seconds"];
    $m = $date["minutes"];
    $h = $date["hours"];
    $digits = array(95, 5, 118, 117, 45, 121, 123, 69, 127, 125);
    $lines = array(1, 1, 1, 2, 0, 1, 0, 2, 1, 0, 1, 1, 0, 0, 0, 1, 0, 2, 1, 2, 0, 1, 1, 1, 0, 0, 1, 0);
        
    draw2digits(4, 2, $h);
    draw2digits(30, 2, $m);
    draw2digits(56, 2, $s);
    set_4pixel(0, 0, 0, 26, 7);
    set_4pixel(0, 0, 0, 26, 13);
    set_4pixel(0, 0, 0, 52, 7);
    set_4pixel(0, 0, 0, 52, 13);

    // 创建循环冗余码校验表
    $z = -306674912;  // = 0xedb88320
    for ($n = 0; $n < 256; $n++) {
        $c = $n;
        for ($k = 0; $k < 8; $k++) {
            $c2 = ($c >> 1) & 0x7fffffff;
            if ($c & 1) $c = $z ^ ($c2); else $c = $c2;
        }
        $crc_table[$n] = $c;
    }

    // PNG file signature
    $result = pack("c*", 137,80,78,71,13,10,26,10);
        
    // IHDR chunk data:
    //   width:              4 bytes
    //   height:             4 bytes
    //   bit depth:          1 byte (8 bits per RGB value)
    //   color type:         1 byte (2 = RGB)
    //   compression method: 1 byte (0 = deflate/inflate)
    //   filter method:      1 byte (0 = adaptive filtering)
    //   interlace method:   1 byte (0 = no interlace)
    $data = pack("c*", ($sx >> 24) & 255,
    ($sx >> 16) & 255,
    ($sx >> 8) & 255,
    $sx & 255,
    ($sy >> 24) & 255,
    ($sy >> 16) & 255,
    ($sy >> 8) & 255,
    $sy & 255,
    8,
    2,
    0,
    0,
    0);
    add_chunk("IHDR");

    // 以下不敢乱翻译，请自行参考
    //    scanline:
    //        filter byte: 0 = none
    //        RGB bytes for the line
    //    the scanline is compressed with "zlib", method 8 (RFC-1950):
    //        compression method/flags code: 1 byte ($78 = method 8, 32k window)
    // &n

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