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用PHP实现登陆验证码(类似条行码状)-网络编程

来源:[db:来源]标题:   ends    编辑:电脑技术全能网 时间:2019-09-22 06:22

原标题:用PHP实现登陆验证码(类似条行码状)-网络编程
   <?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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