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UPC码(Universal Product Code)是最早大规模应用的条码,其特性是一种长度固定、连续性的条码,由於其应用范围广泛,故又被称 万用条码。UPC码仅可用来表示数字,故其字码集为数字0~9。UPC码共有A、B、C、D、E等五种版本。本文介绍的就是用 PHP 生 成 UPC- A 条形码。<?phpfunction 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");?> 效果