<?php

require_once 'string.func.php';

//通过GD库做验证码

//创建画布

$width=80;

$height=20;

$image=imagecreatetruecolor($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("FZCCHFW.TTF","FZCCHJW.TTF","MSYH.TTF","SIMKAI.TTF","MSYHBD.TTF");

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);

    $fontfile="C:/Windows/Fonts/fonts/".$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);

}

$pixel=50;

if($pixel){

for($i=0;$i<50;$i++){

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

  }

}

$line=10;

if($line){

    for($i=1;$i<line;$i++){

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

        imageline($image,  mt_rand(0, $width-1), mt_rand(0, $height-1), $color);

    }

}

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

imagegif($image);

imagedestroy($image);