for($i = 0; $i $_md_color = imagecolorallocate($_img,mt_rand(0, 255),mt_rand(0, 255), mt_rand(0, 255));
imageline($_img, mt_rand(0, 75), mt_rand(0, 75), mt_rand(0, 75), mt_rand(0, 75),$_md_color); }//随机雪花for($i = 0; $i $_md_color = imagecolorallocate($_img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255)); imagestring($_img, 1, mt_rand(1, $_width), mt_rand(1, $_height), '*', $_md_color);}//黑色边框$_black = imagecolorallocate($_img, 0, 0, 0);imagerectangle($_img, 0, 0, $_width-1, $_height-1, $_black);//输出验证码for($i = 0;$i $_mt_color = imagecolorallocate($_img, mt_rand(0, 100), mt_rand(0, 150), mt_rand(0, 200)); imagestring($_img, mt_rand(3, 5), $i*$_width/4+mt_rand(1, 10), mt_rand(1, $_height/2), $_session['code'][$i],$_mt_color); }header('content-type:image/png');imagepng($_img);//销毁imagedestroy($_img);?>
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