PHP生成条形码实现程序

发布:smiling　来源: PHP粉丝网　添加日期：2014-01-06 10:33:59　浏览: 评论：0　

条形码(barcode)是将宽度不等的多个黑条和空白,按照一定的编码规则排列,用以表达一组信息的图形标识符,常见的条形码是由反射率相差很大的黑条（简称条）和白条（简称空）排成平行线的图案对于上面有个大概的了解后,下面我们可以重新整合下代码,更加方便的使用它,代码如下:

function UPCAbarcode($code)

{

    $lw = 2; $hi = 100;

    $Lencode = array('0001101','0011001','0010011','0111101','0100011',

                    '0110001','0101111','0111011','0110111','0001011');

    $Rencode = array('1110010','1100110','1101100','1000010','1011100',

                    '1001110','1010000','1000100','1001000','1110100');

    $ends = '101'; $center = '01010';



    /* UPC-A Must be 11 digits, we compute the checksum. */

    if ( strlen($code) != 11 ) { die("UPC-A Must be 11 digits."); }



    /* Compute the EAN-13 Checksum digit */

    $ncode = '0'.$code;

    $even = 0; $odd = 0;

    for ($x=0;$x<12;$x++)

    {

        if ($x % 2) { $odd += $ncode[$x]; } else { $even += $ncode[$x]; }

    }



    $code.=(10 - (($odd * 3 + $even) % 10)) % 10;



    /* Create the bar encoding using a binary string */

    $bars=$ends;

    $bars.=$Lencode[$code[0]];

    for($x=1;$x<6;$x++)

    {

        $bars.=$Lencode[$code[$x]];

    }



    $bars.=$center;



    for($x=6;$x<12;$x++)

    {

        $bars.=$Rencode[$code[$x]];

    }



    $bars.=$ends;



    /* Generate the Barcode Image */

    $img = ImageCreate($lw*95+30,$hi+30);

    $fg = ImageColorAllocate($img, 0, 0, 0);

    $bg = ImageColorAllocate($img, 255, 255, 255);

    ImageFilledRectangle($img, 0, 0, $lw*95+30, $hi+30, $bg);



    $shift=10;



    for ($x=0;$x<strlen($bars);$x++)

    {

        if (($x<10) || ($x>=45 && $x<50) || ($x >=85)) { $sh=10; } else { $sh=0; }

        if ($bars[$x] == '1') { $color = $fg; } else { $color = $bg; }

        ImageFilledRectangle($img, ($x*$lw)+15,5,($x+1)*$lw+14,$hi+5+$sh,$color);

    }



    /* Add the Human Readable Label */

    ImageString($img,4,5,$hi-5,$code[0],$fg);



    for ($x=0;$x<5;$x++)

    {

        ImageString($img,5,$lw*(13+$x*6)+15,$hi+5,$code[$x+1],$fg);

        ImageString($img,5,$lw*(53+$x*6)+15,$hi+5,$code[$x+6],$fg);

    }



    ImageString($img,4,$lw*95+17,$hi-5,$code[11],$fg);



    /* Output the Header and Content. */

    header("Content-Type: image/png");

    ImagePNG($img);



}



UPCAbarcode('13322483157');



?>