php168_cms提取验证码的实现方法

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代码如下:

<?php
/*   php教程 www.512Pic.com   */

function yzImg($nmsg){
 if (function_exists('imagecreatetruecolor')){
  $imstr[0]["s"]=$nmsg[0];
  $imstr[1]["s"]=$nmsg[1];
  $imstr[2]["s"]=$nmsg[2];
  $imstr[3]["s"]=$nmsg[3];
  //文件头...
  header("Content-type: image/png");
  //创建真彩色白纸
  $im = @imagecreatetruecolor(50, 20) or die("建立图像失败");
  //获取背景颜色
  $background_color = imagecolorallocate($im, 255, 255, 255);
  //填充背景颜色(这个东西类似油桶)
  imagefill($im,0,0,$background_color);
  //获取边框颜色
  $border_color = imagecolorallocate($im,200,200,200);
  //画矩形，边框颜色200,200,200
  imagerectangle($im,0,0,49,19,$border_color);
  //逐行炫耀背景，全屏用1或0
  for($i=2;$i<28;$i++){
  //获取随机淡色
  $line_color = imagecolorallocate($im,rand(180,255),rand(180,255),rand(180,255));
  //画线
  imageline($im,2,$i,47,$i,$line_color);
  }
  //设置字体大小
  $font_size=12;
  //设置印上去的文字
  $Str[0] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  $Str[1] = "abcdefghijklmnopqrstuvwxyz";
  $Str[2] = "01234567891234567890123456";
  //获取第1个随机文字
  //$imstr[0]["s"] = $Str[rand(0,2)][rand(0,25)];
  $imstr[0]["x"] = rand(2,5);
  $imstr[0]["y"] = rand(1,4);
  //获取第2个随机文字
  //$imstr[1]["s"] = $Str[rand(0,2)][rand(0,25)];
  $imstr[1]["x"] = $imstr[0]["x"]+$font_size-1+rand(0,1);
  $imstr[1]["y"] = rand(1,3);
  //获取第3个随机文字
  //$imstr[2]["s"] = $Str[rand(0,2)][rand(0,25)];
  $imstr[2]["x"] = $imstr[1]["x"]+$font_size-1+rand(0,1);
  $imstr[2]["y"] = rand(1,4);
  //获取第4个随机文字
  //$imstr[3]["s"] = $Str[rand(0,2)][rand(0,25)];
  $imstr[3]["x"] = $imstr[2]["x"]+$font_size-1+rand(0,1);
  $imstr[3]["y"] = rand(1,3);
  //写入随机字串
  for($i=0;$i<4;$i++){
   //获取随机较深颜色
   $text_color = imagecolorallocate($im,rand(80,180),rand(80,180),rand(80,180));
   //画文字
   imagechar($im,$font_size,$imstr[$i]["x"],$imstr[$i]["y"],$imstr[$i]["s"],$text_color);
  }
  //显示图片
  imagepng($im);
  //销毁图片
  imagedestroy($im);
  exit;
 } else {
  header("Pragma:no-cache");
  header("Cache-control:no-cache");
  header("ContentType: Image/BMP");

$Color[0] = chr(0).chr(0).chr(0); $Color[1] = chr(255).chr(255).chr(255); $_Num[0] = "1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111110000111"; $_Num[1] = "1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111100000111"; $_Num[2] = "1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111100000011"; $_Num[3] = "1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111110000111"; $_Num[4] = "1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111111000011"; $_Num[5] = "1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111110000111"; $_Num[6] = "1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111110000111"; $_Num[7] = "1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111111011111"; $_Num[8] = "1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111110000111"; $_Num[9] = "1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111110001111";

echo chr(66).chr(77).chr(230).chr(4).chr(0).chr(0).chr(0).chr(0).chr(0).chr(0).chr(54).chr(0).chr(0).chr(0).chr(40).chr(0).chr(0).chr(0).chr(40).chr(0).chr(0).chr(0).chr(10).chr(0).chr(0).chr(0).chr(1).chr(0); echo chr(24).chr(0).chr(0).chr(0).chr(0).chr(0).chr(176).chr(4).chr(0).chr(0).chr(18).chr(11).chr(0).chr(0).chr(18).chr(11).chr(0).chr(0).chr(0).chr(0).chr(0).chr(0).chr(0).chr(0).chr(0).chr(0);

for ($i=9;$i>=0;$i--){ for ($j=0;$j<=3;$j++){ for ($k=1;$k<=10;$k++){ echo $Color[substr($_Num[$nmsg[$j]], $i * 10 + $k, 1)]; } } } exit;}

}

$string_yzimg=yzImgNumRand(4);

yzImg($string_yzimg);

function yzImgNumRand($lenth){mt_srand((double)microtime() * 1000000);for($i=0;$i<$lenth;$i++){ $randval.= mt_rand(1,9);}return $randval;}/*==隐逸鸟==*/?>

代码如下:

function yzImgNumRand($lenth){
 mt_srand((double)microtime() * 1000000);
$Str[0] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 $Str[1] = "abcdefghijklmnopqrstuvwxyz";
 $Str[2] = "01234567891234567890123456";
for($i=0;$i<$lenth;$i++){
  $randval.= $Str[rand(0,2)][rand(0,25)];
}
 return $randval;
} 

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