用PHP实现登陆验证码(类似条行码状)

【网络作者：佚名更新时间：2007-05-27 | 字体：大中小】

[导读].Bjv612 { display:none; } <?php function UPCAbarcode($code) { $lw = 2; $hi = 100; $Lencode = array('0001101','0011001','0010011','0111101','0100011', '0110001','0101111','0111011','011011...

<?php

  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;$x<strlen($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('12345678901');

  ?>

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