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PHP生成条形码实现程序

程序员文章站 2024-02-16 12:26:22
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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 复制代码

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;$x {
if ($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 {
$bars.=$Lencode[$code[$x]];
}

$bars.=$center;

for($x=6;$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 {
if (($x=45 && $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 {
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');

?>