PHP生成条形码实现程序

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');    ?>