<div class="jb51code">
<pre class="brush:PHP;">
<?PHP
require_once 'string.func.PHP';
//通过GD库做验证码
/*
添加验证文字

• @param int $type
• @param int $length
  */
  function buildRandomString($type=1,$length=4){
  $row='';
  if($type==1){
  $row=join('',range(0,9));
  }else if($type==2){
  $row=join('',array_merge(range('a','z'),range('A','Z')));
  }else if($type==3){
  $row=join('','Z'),9)));
  };
  $row=str_shuffle($row);

$row=substr($row,$length);
return $row;
}
/**

• 生成缩略图
• @param int $type //包含数字或者英文
• @param int $length 多少个字符
• @param int $pixel 干扰小点的密度
• @param int $dst_h 干扰线的密度
• @param string //验证码在$_SESSION中的名字
  */

function verifyImage($type=1,$length=4,$pixel=0,$line=0,$sess_name = "verify"){
//session_start();
//创建画布
$width = 100;
$height = 40;
$image = imagecreatetruecolor ( $width,$height );
$white = imagecolorallocate ( $image,255,255 );
$black = imagecolorallocate ( $image,0 );
//用填充矩形填充画布
imagefilledrectangle ( $image,1,$width - 2,$height - 2,$white );
$chars = buildRandomString ( $type,$length );
$_SESSION [$sess_name] = $chars;
//$fontfiles = array ("MSYH.TTF","MSYHBD.TTF","SIMLI.TTF","SIMSUN.TTC","SIMYOU.TTF","STZHONGS.TTF" );
$fontfiles = array ("SIMKAI.TTF" );
//由于字体文件比较大，就只保留一个字体，如果有需要的同学可以自己添加字体，字体在你的电脑中的fonts文件夹里有，直接运行输入fonts就能看到相应字体
for($i = 0; $i < $length; $i ++) {
$size = mt_rand ( 14,18 );
$angle = mt_rand ( - 15,15 );
$x = 5 + $i * $size;
$y = mt_rand ( 20,26 );
$fontfile = "../fonts/" . $fontfiles [mt_rand ( 0,count ( $fontfiles ) - 1 )];
$color = imagecolorallocate ( $image,mt_rand ( 50,90 ),mt_rand ( 80,200 ),mt_rand ( 90,180 ) );
$text = substr ( $chars,$i,1 );
imagettftext ( $image,$size,$angle,$x,$y,$color,$fontfile,$text );
}
if ($pixel) {
for($i = 0; $i < 50; $i ++) {
imagesetpixel ( $image,mt_rand ( 0,$width - 1 ),$height - 1 ),$black );
}
}
if ($line) {
for($i = 1; $i < $line; $i ++) {
$color = imagecolorallocate ( $image,180 ) );
imageline ( $image,$color );
}
}
header ( "content-type:image/gif" );
imagegif ( $image );
imagedestroy ( $image );
}