img.php

开源的 库存管理系统 www.minierp.cn php+ mysql

<?php 
//生成验证码图片 
//header("content-type: image/png");  
srand((double)microtime()*1000000); 
$im = imagecreate(62,20); 
$black = imagecolorallocate($im, 0,0,0); 
$white = imagecolorallocate($im, 0,255,255); 
$gray  = imagecolorallocate($im, 200,200,200); 
imagefill($im,68,30,$gray); 
while(($authnum=rand()%100000)<10000);
session_start();
$_SESSION["unum"] = "$authnum";
//将四位整数验证码绘入图片 
imagestring($im,5, 10, 3,$authnum, $white); 
for($i=0;$i<200;$i++) //加入干扰象素 
{ 
  $randcolor = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));
  imagesetpixel($im, rand()%70 , rand()%30 , $randcolor); 
} 
imagepng($im); 
imagedestroy($im);
?>