首先在index.php页面
function identity(){ $this->load->view('index',$data); } function codes(){ if($_POST['code'] == $_SESSION['code']){ echo 'ok'; }else{ echo 'no'; } } function create_code(){ session_start(); //生成验证码图片 ob_clean(); //header("Content-type:image/png"); //全数字 $str="1,2,3,4,5,6,7,8,9,0,a,b,c,d,e,f";//要显示的字符，自己可以增加或删除 $list=explode(",",$str); $r=count($list)-1; $laststr=""; for($i=0;$i<4;$i++){ $randnum=mt_rand(0,$r); $laststr .= $list[$randnum];//取出字符，组合成要显示的字符串 } $_SESSION['code']=$laststr; //将字符串放入SESSION中 //echo $laststr; $img=imagecreate(28,28);//生成图片 $black=imagecolorallocate($img,0,0,0); // 设置颜色 $white=imagecolorallocate($img,255,255,255); $gray=imagecolorallocate($img,200,200,200); $red=imagecolorallocate($img,255,0,0); $cl = imagefill($img,0,0,$red);//给图片填充颜色 //将验证法放入图片 imagestring($img,4,10,8,$laststr,$black);//将验证码放到图片上 for ($i=0;$i<8;$i++){ $lineColor = imagecolorallocate($img,rand(0,255),rand(0,255),rand(0,255)); imageline ($img,rand(0,$x),0,rand(0,$x),$y,$lineColor); } //干扰点 for ($i=0;$i<250;$i++){ imagesetpixel($img,rand(0,$x),rand(0,$y),$fontColor); } $aa = imagepng($img); $bb = imagedestroy($img); //echo $aa; }在视图页面index.php
<form action="/index/codes" method="post"> <label for="yzmai" class="input-tips2">验证码：</label> <input type="text" name="code" class="inputstyle2" maxlength="10" /><br/> <img id="code" src="/index/create_code" alt="看不清楚，换一张" style="max-width:90%" onClick="create_code()"/> <button type="submit">提交</button> </form><script>function create_code(){ document.getElementById('code').src = '/index/create_code/'+Math.random()*10000;}</script>可以去尝试下看看
