php图像验证代码

时间：2015-01-23 来源：西部数据作者：西部数据

<?php

session_start();

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

$str = "的一是在了不和有大这主中人上为们地个用工时要动国产以我到绳穷塘燥泡袋朗喂铝软渠颗惯贸粪综墙趋彼届墨碍启逆卸航雾冠丙街莱";

$imgwidth = 110;

$imgheight = 24;

$authimg = imagecreate($imgwidth,$imgheight);

$bgcolor = imagecolorallocate($authimg,255,255,255);

$fontfile = "wrzc_net.ttf";

$white=imagecolorallocate($authimg,234,185,95);

imagearc($authimg, 150, 8, 20, 20, 75, 170, $white);

imagearc($authimg, 100, 7,50, 22, 75, 175, $white);

imageline($authimg,20,20,180,30,$white);

imageline($authimg,20,18,170,50,$white);

imageline($authimg,25,50,80,50,$white);

$noise_num = 100;

$line_num = 5;

imagecolorallocate($authimg,0xff,0xff,0xff);

$rectangle_color=imagecolorallocate($authimg,0xaa,0xaa,0xaa);

$noise_color=imagecolorallocate($authimg,0x33,0x33,0x33);

$font_color=imagecolorallocate($authimg,0x00,0x00,0x00);

$line_color=imagecolorallocate($authimg,0x00,0x00,0x00);

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

imagesetpixel($authimg,mt_rand(0,$imgwidth),mt_rand(0,$imgheight),$noise_color);

}

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

imageline($authimg,mt_rand(0,$imgwidth),mt_rand(0,$imgheight),mt_rand(0,$imgwidth),mt_rand(0,$imgheight),$line_color);

}//开源代码phpfensi.com

$randnum=rand(0,strlen($str)-4);

if($randnum%2)$randnum+=1;

$str = substr($str,$randnum,8);

$_session['supdesverify'] = $str;

$str = iconv("gb2312","utf-8",$str);

imagettftext($authimg, 20, 0, 0, 21, $font_color, $fontfile, $str);

imagepng($authimg);

imagedestroy($authimg);

?>