<?php

require_once 'string.func.php';

//通过GD库做验证码

//创建画布

$width=80;

$height=28;

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

$white=imagecolorallocate($image,255,255,255);

$black=imagecolorallocate($image,0,0,0);

//用填充矩形填充画布

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

$type=1;

$length=4;

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

$sess_name="verify";

$_SESSION[$sess_name]=$chars;

$fontfiles=array("FZLTCXHJW.TTF","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);

    $fontfile="../fonts/".$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);

    for($i = 0; $i < 50; $i++) {

        imagesetpixel ( $image, mt_rand ( 0, $width - 1 ), mt_rand ( 0, $height - 1 ), $black );

    }

}

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

imagegif($image);

imagedestroy($image);