<?php

require_once 'string.func.php';

function verifyImage(){

session_start();

$width=80;

$height=30;

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

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

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

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 ("SIMYOU.TTF","FZSTK.TTF","SIMLI.TTF","STCAIYUN.TTF","STLITI.TTF","STXINGKA.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);

$fontfile = "../fonts/".$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,$angel,$x,$y,$color,$fontfile,$text);

}

$pixel=20;

if($pixel){

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

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

}

}

$line=5;

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

}

}

ob_clean();

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

imagegif($image);

imagedestroy($image);

}

verifyImage();