如何用php实现生成条形码图片

用php生成一个条形码的图片 ，在自己项目的根目录下建立一个测试文件(直接把下面的代码放进去运行一下看看，在实际的项目中你可以将下面的代码封装到一个公共类文件下的一个函数，然后调用。

class testinfo{
  function UPCAbarcode($code) {
    $trans_code = $code;
    $lw = 2.2; $hi = 40;
    $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';
    /* 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*75+30,$hi-3);  // 95
    $fg = ImageColorAllocate($img, 0, 0, 0);
    $bg = ImageColorAllocate($img, 255, 255, 255);
    ImageFilledRectangle($img, 0, 0, $lw*75+30, $hi+30, $bg);
    $shift=10;
    for ($x=0;$x<strlen($bars);$x++) {
      if (($x<0) || ($x>=45 && $x<46) || ($x >=85)) {
        $sh=10;
      } else { $sh=0;
      }
      if ($bars[$x] == &#39;1&#39;) {
        $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*95-7,$hi,$code[11],$fg);
    /* Output the Header and Content. */
    header("Content-Type: image/png");
    ImagePNG($img);
  }
//}
echo UPCAbarcode(&#39;201212070099&#39;);

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