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); ?>