验证码

<?php/** * Created by PhpStorm. * User: dllo * Date: 16/8/12 * Time: 下午3:14 */session_start();header("Content-type:text/html;charset=utf-8");header("Content-type: image/png");$width = 200;$height = 100;$im = @imagecreatetruecolor($width,$height) or die('创建图像失败');$backgroundColor = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));imagefill($im,0,0,$backgroundColor);$borderColor = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));imagerectangle($im,0,0,$width-1,$height-1,$borderColor);$textColor = imagecolorallocate($im,rand(50,180),rand(50,180),rand(50,180));$fontSize = rand(14,18);$code =  rand(999,9999);imagestring($im,$fontSize,rand(20,$width/2),rand($height /2 ,$height-20),$code,$textColor);$_SESSION["mycode"] = $code;imagepng($im);imagedestroy();