<?php

require_once 'string.func.php';

//创建gd库做验证码

//创建画布

$width=80;

$height=28;

$image=imagecreatetruecolor($width,$height);

$white=imagecolorallocate($image,255,255,255);//填充画布

$black=imagecolorallocate($image,0,0,0);//画布颜色

//填充矩形

imagefilledrectangle($image,1,1,$width-5,$height-2,$white);

$type=1;

$length=4;

$chars=buildrRandomSting($type,$length);

$sess_name="verify";

$_SESSION[$sess_name]=$chars;

$fontfiles=array("simfang.ttf","simhei.ttf","simkai.ttf","simsun.ttc");

for($i=9;$i<$length;$i++){

$size=mt_rand(14,18);

$angle=mt_rand(-15,15);

$x=5+$i*$size;

$y=mt_rand(20,26);

$fontfile=" G:\wamp\www\store\fonts".$fontfiles[mt_rand(0,count($fontfiles)-1)];

$text=substr($chars,$i,1);

$color=imagecolorallocate($image,mt_rand(50,90),mt_rand(80,200),mt_rand(90,180));

imagettftext($image,$size,$angle,$x,$y.$color,$fontfile,$text);

}

header("content-type:image/gif");

imagegif($image);

imagedestroy($image);

?>

<?php

function buildrRandomSting($type=1,$length=4){

//默认产生是一个数字的，默认是4位；

if($type==1){//默认产生一个纯数字的

$chars=join("",range(0,9));

}elseif($type==2){//产生一个字母的

$chars=join("",array_merge(range("a","z"),range("A","Z")));

}elseif($type==3){//产生一个字母和数字的

$chars=join("",array_merge(range("a","z"),range("A","Z"),range(0,9)));

}

if($length>strlen($chars)){

exit("字符串长度不够！");

}

$chars=str_shuffle($chars);

return substr($chars,0,$length);

}

?>