www.gusucode.com > 搜一次CMS电影程序 PHP 1.5源码程序 > include/code.php

    <?php
	Header("Content-type:image/png");
	session_start();//开启session;
	$authnum_session = ''; 
	$str = '1234567890'; 
	$l = strlen($str); //得到字串的长度; 
	for($i=1;$i<=4;$i++)
	{ 
	$num=rand(0,$l-1); 
	$authnum_session.= $str[$num]; 
	}
	$_SESSION["codes"]=$authnum_session;
	session_register("authnum_session");
	srand((double)microtime()*1000000);
	$im = imagecreate(50,20);//图片宽与高; 
	$black = ImageColorAllocate($im, 0,0,0);
	$white = ImageColorAllocate($im, 255,255,255);
	$gray = ImageColorAllocate($im, 200,200,200); 
	imagefill($im,68,30,$gray);
	$li = ImageColorAllocate($im, 220,220,220);
	for($i=0;$i<3;$i++) 
	{
	imageline($im,rand(0,30),rand(0,21),rand(20,40),rand(0,21),$li);
	} 
	imagestring($im, 5, 8, 2, $authnum_session, $white);
	for($i=0;$i<90;$i++)
	{
	imagesetpixel($im, rand()%70 , rand()%30 , $gray);
	}
	ImagePNG($im);
	ImageDestroy($im);

?>