/**
  * 会员信息更新
  * updateUserInfo
  * @author copoet
  */
 public function updateUserInfo()
 {
     $userModel = D('users');
     $id = I('post.id');
     if (empty($id)) {
         $this->assign('系统异常');
     }
     $username = I('post.username');
     if (empty($username)) {
         $this->error('用户名不能为空');
         exit;
     }
     $phone = I('post.phone');
     $check_phone = CheckToolServices::checkPhoneFormat($phone);
     //验证手机格式
     if ($check_phone['status'] === false) {
         $this->error("{$check_phone['msg']}");
     }
     $email = I('post.email');
     $check = CheckToolServices::checkEmailFormat($email);
     //验证邮箱格式
     if ($check['status'] === false) {
         $this->error("{$check['msg']}");
     }
     $member_info = $userModel->getUsersInfo($id);
     if ($member_info['username'] !== $username) {
         $check_data = checkUsers($username, '', '');
         if ($check_data['status'] === false) {
             $this->error("{$check_data['msg']}");
         }
     } elseif ($member_info['email'] !== $email) {
         $check_data = checkUsers('', $email, '');
         if ($check_data['status'] === false) {
             $this->error("{$check_data['msg']}");
         }
     } elseif ($member_info['phone'] !== $phone) {
         $check_data = checkUsers('', '', $phone);
         if ($check_data['status'] === false) {
             $this->error("{$check_data['msg']}");
         }
     }
     $password = I('post.password');
     if (!empty($password)) {
         $data['password'] = get_password($username, $password);
     } else {
         $data['password'] = $member_info['password'];
     }
     $data['username'] = $username;
     $data['phone'] = $phone;
     $data['email'] = $email;
     $data['status'] = $_POST['status'][0];
     $data['up_time'] = time();
     $where['id'] = array('eq', $id);
     $result = $userModel->updateUser($where, $data);
     if ($result) {
         $this->success('会员信息更新成功');
     } else {
         $this->error('会员信息更新失败');
     }
 }
<?php

require './core/init.php';
//echo $_POST['username'];
//echo $_POST['email'];
//
//if (in_array($_POST['username'], $arr)){
//    echo true;
//}
function checkUsers()
{
    $queryUsername = mysql_query("SELECT username FROM users");
    $rows = array();
    $usernames = array();
    while ($data = mysql_fetch_array($queryUsername)) {
        foreach ($data as $value) {
            array_push($usernames, $value);
        }
    }
    //print_r($usernames);
    if (in_array($_POST['username'], $usernames)) {
        echo "uFalse";
    } else {
        //if isnt taken
        echo "uTrue";
    }
}
checkUsers();