PHP generate barcode implementation program_PHP tutorial

Barcode is a graphical identifier that expresses a set of information by arranging multiple black bars and blanks of varying widths according to certain encoding rules. A common barcode is a pattern consisting of black bars (referred to as bars) and white bars (referred to as spaces) with very different reflectivities arranged in parallel lines. After having a general understanding of the above, we can re-integrate the code below to make it more convenient to use. it.

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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;$x { if (($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'); ?>

http://www.bkjia.com/PHPjc/631564.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631564.htmlTechArticleBarcode (barcode) is a combination of multiple black bars and blanks with different widths, arranged according to certain encoding rules. A graphical identifier used to express a set of information. Common barcodes are composed of reflectivity differences...