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PHP output UPC-A 11-digit barcodes

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  1. <?php
  2.  
  3. function UPCAbarcode($code) {
  4.   $lw = 2; $hi = 100;
  5.   $Lencode = array('0001101','0011001','0010011','0111101','0100011',
  6.                    '0110001','0101111','0111011','0110111','0001011');
  7.   $Rencode = array('1110010','1100110','1101100','1000010','1011100',
  8.                    '1001110','1010000','1000100','1001000','1110100');
  9.   $ends = '101'; $center = '01010';
  10.   /* UPC-A Must be 11 digits, we compute the checksum. */
  11.   if ( strlen($code) != 11 ) { die("UPC-A Must be 11 digits."); }
  12.   /* Compute the EAN-13 Checksum digit */
  13.   $ncode = '0'.$code;
  14.   $even = 0; $odd = 0;
  15.   for ($x=0;$x<12;$x++) {
  16.     if ($x % 2) { $odd += $ncode[$x]; } else { $even += $ncode[$x]; }
  17.   }
  18.   $code.=(10 - (($odd * 3 + $even) % 10)) % 10;
  19.   /* Create the bar encoding using a binary string */
  20.   $bars=$ends;
  21.   $bars.=$Lencode[$code[0]];
  22.   for($x=1;$x<6;$x++) {
  23.     $bars.=$Lencode[$code[$x]];
  24.   }
  25.   $bars.=$center;
  26.   for($x=6;$x<12;$x++) {
  27.     $bars.=$Rencode[$code[$x]];
  28.   }
  29.   $bars.=$ends;
  30.   /* Generate the Barcode Image */
  31.   $img = ImageCreate($lw*95+30,$hi+30);
  32.   $fg = ImageColorAllocate($img, 0, 0, 0);
  33.   $bg = ImageColorAllocate($img, 255, 255, 255);
  34.   ImageFilledRectangle($img, 0, 0, $lw*95+30, $hi+30, $bg);
  35.   $shift=10;
  36.   for ($x=0;$x<strlen($bars);$x++) {
  37.     if (($x<10) || ($x>=45 && $x<50) || ($x >=85)) { $sh=10; } else { $sh=0; }
  38.     if ($bars[$x] == '1') { $color = $fg; } else { $color = $bg; }
  39.     ImageFilledRectangle($img, ($x*$lw)+15,5,($x+1)*$lw+14,$hi+5+$sh,$color);
  40.   }
  41.   /* Add the Human Readable Label */
  42.   ImageString($img,4,5,$hi-5,$code[0],$fg);
  43.   for ($x=0;$x<5;$x++) {
  44.     ImageString($img,5,$lw*(13+$x*6)+15,$hi+5,$code[$x+1],$fg);
  45.     ImageString($img,5,$lw*(53+$x*6)+15,$hi+5,$code[$x+6],$fg);
  46.   }
  47.   ImageString($img,4,$lw*95+17,$hi-5,$code[11],$fg);
  48.   /* Output the Header and Content. */
  49.   header("Content-Type: image/png");
  50.   ImagePNG($img);
  51. }
  52.  
  53. UPCAbarcode('12345678901');
  54.  
  55. ?>

URL: http://www.barcodeisland.com

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