檢查用戶名和電子郵件已存在於php mysql

Question

檢查用戶名和電子郵件已經存在於php mysql中，我檢查每個輸入是否爲空或如果沒有空然後檢查用戶名和密碼是否已經在數據庫中，如果它不在數據庫中，然後回顯ALRIGHT，代碼工作正常，但問題是，它不打印好吧當新的條目進行。

下面是代碼：

<?php 
error_reporting(E_ALL & ~E_NOTICE); 
require_once('dbcon.php'); 
if(isset($_POST["create"])) 
{ 
    if (isset($_POST['username']) && !empty($_POST['username'])) { 
     $username=mysqli_real_escape_string($conn,trim($_POST['username'])); 
    }else{ 
     $empty_username="Username Cannot be empty."; 
     echo $empty_username.'<br>'; 
    } 
    if (isset($_POST['email']) && !empty($_POST['email'])) { 
     $email=mysqli_real_escape_string($conn,trim($_POST['email'])); 
    }else{ 
     $empty_email="Email cannot be empty."; 
     echo $empty_email.'<br>'; 
    } 

    if (isset($_POST['category']) && !empty($_POST['category'])) { 
     $category=mysqli_real_escape_string($conn,trim($_POST['category'])); 
    }else{ 
     $empty_category="Category cannot be empty."; 
     echo $empty_category.'<br>'; 
    } 

    if (isset($_POST['password']) && !empty($_POST['password'])) { 
     $psw=mysqli_real_escape_string($conn,trim($_POST['password'])); 
    }else{ 
     $empty_password="Password cannot be empty"; 
     echo $empty_password.'<br>'; 
    } 

    if (isset($_POST['re_password']) && !empty($_POST['re_password'])) { 
     $repsw=mysqli_real_escape_string($conn,trim($_POST['re_password'])); 
    }else{ 
     $empty_repassword="Retype password cannot be empty"; 
     echo $empty_repassword.'<br>'; 
    } 

    $password=password_hash('$psw',PASSWORD_BCRYPT); 
    $date=mysqli_real_escape_string($conn, trim('now()')); 
    if($psw!=$repsw) 
    { 
     echo"password not Matched"; 
    } 
     $sql="select * from account_info where (username='$username' or email='$email');"; 
     $res=mysqli_query($conn,$sql); 
     if (mysqli_num_rows($res) > 0) { 
     // output data of each row 
     $row = mysqli_fetch_assoc($res); 
     if ($username==$row['username']) 
     { 
      echo "Username already exists"; 
     } 
     elseif($email==$row['email']) 
     { 
      echo "Email already exists"; 
     } 
     else{ 
      echo "alright"; 
     } 
    } 
} 
?> 

Answer 1

您只需要添加其他cond銀行足球比賽在正確的地方

試試這個： -

<?php 
    error_reporting(E_ALL & ~E_NOTICE); 
    require_once('dbcon.php'); 
    if(isset($_POST["create"])) 
    { 
     $error = 0; 
     if (isset($_POST['username']) && !empty($_POST['username'])) { 
      $username=mysqli_real_escape_string($conn,trim($_POST['username'])); 
     }else{ 
      $error = 1; 
      $empty_username="Username Cannot be empty."; 
      echo $empty_username.'<br>'; 
     } 
     if (isset($_POST['email']) && !empty($_POST['email'])) { 
      $email=mysqli_real_escape_string($conn,trim($_POST['email'])); 
     }else{ 
      $error =1; 
      $empty_email="Email cannot be empty."; 
      echo $empty_email.'<br>'; 
     } 

     if (isset($_POST['category']) && !empty($_POST['category'])) { 
      $category=mysqli_real_escape_string($conn,trim($_POST['category'])); 
     }else{ 
      $error = 1; 
      $empty_category="Category cannot be empty."; 
      echo $empty_category.'<br>'; 
     } 

     if (isset($_POST['password']) && !empty($_POST['password'])) { 
      $psw=mysqli_real_escape_string($conn,trim($_POST['password'])); 
     }else{ 
      $error = 1; 
      $empty_password="Password cannot be empty"; 
      echo $empty_password.'<br>'; 
     } 

     if (isset($_POST['re_password']) && !empty($_POST['re_password'])) { 
      $repsw=mysqli_real_escape_string($conn,trim($_POST['re_password'])); 
     }else{ 
      $error = 1; 
      $empty_repassword="Retype password cannot be empty"; 
      echo $empty_repassword.'<br>'; 
     } 

     $password=password_hash('$psw',PASSWORD_BCRYPT); 
     $date=mysqli_real_escape_string($conn, trim('now()')); 
     if($psw!=$repsw) 
     { 
      echo "password not Matched"; 
     } 

     if(!$error) { 
      $sql="select * from account_info where (username='$username' or email='$email');"; 
      $res=mysqli_query($conn,$sql); 
      if (mysqli_num_rows($res) > 0) { 
      // output data of each row 
      $row = mysqli_fetch_assoc($res); 
      if ($username==$row['username']) 
      { 
       echo "Username already exists"; 
      } 
      elseif($email==$row['email']) 
      { 
       echo "Email already exists"; 
      } 
     }else { //here you need to add else condition 
      echo "alright"; 
     } 
     } 
    } 
    ?> 

Answer 2

你把這個錯的，如果條件

$sql="select * from account_info where (username='$username' or email='$email');"; 
     $res=mysqli_query($conn,$sql); 
     if (mysqli_num_rows($res) > 0) { 
     // output data of each row 
     $row = mysqli_fetch_assoc($res); 
     if ($username==$row['username']) 
     { 
      echo "Username already exists"; 
     } 
     elseif($email==$row['email']) // change it to just else 
     { 
      echo "Email already exists"; 
     } 
     else{ 
      echo "alright"; // don't put it here 
     } 
    } 

要打印好嗎把你別的之外，如果和elseif的改變，只是別人像這樣：

$sql="select * from account_info where (username='$username' or email='$email');"; 

     $res=mysqli_query($conn,$sql); 

     if (mysqli_num_rows($res) > 0) { 
     // output data of each row 
     $row = mysqli_fetch_assoc($res); 
     if ($username==$row['username']) 
     { 
      echo "Username already exists"; 
     } 
     else($email==$row['email']) 
     { 
      echo "Email already exists"; 
     } 

     } else{ // if condition ends here if it is new entry, echo will work 
      echo "alright"; 
     } 

Answer 3

這可以幫助你來驗證我只給你的用戶名重複它，並讓這個AJAX腳本是在同一頁上運行電子郵件不需要創建外部文件，我的意思是讓我們說你在login.php上進行了驗證，下面的這個Ajax保留在login.php中同一頁面上的所有腳本，將PHP代碼更改爲您的規範。看，什麼oninput =用戶名的意思是，當用戶開始輸入運行功能checkusername（）和顯示結果

 <input type ="text" oninput="checkusername()" id="uname" placeholder="Your username for check" class="oshe"> 

     <span id="usernamestatus"></span> 

//ajax script on the same page do not make a new file function checkusername 
<script> function checkusername(){ 
var status = document.getElementById("usernamestatus"); 
var u = document.getElementById("uname").value; 
if(u != ""){ status.innerHTML = '<b style="color:red;">checking...</b>'; var hr = new XMLHttpRequest(); 
hr.open("POST", "a.php", true); 
hr.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); hr.onreadystatechange = function() { 
if(hr.readyState == 4 && hr.status == 200) { 
status.innerHTML = hr.responseText; 
} } 
var v = "name2check="+u; hr.send(v); } } 
</script> 



//the php script to search database 
<?php 
if(isset($_POST["name2check"]) && $_POST["name2check"] != ""){ 
include_once 'connect.php'; 
$username = ($_POST['name2check']); 
$sql_uname_check = mysqli_query($con, "SELECT matric FROM users WHERE matric='$username' LIMIT 1"); 
$uname_check = mysqli_num_rows($sql_uname_check); 
if (strlen($username) < 2) { 
echo '<b style="color:white;">2 - 35 characters please</b>'; 
exit(); 
} 
if (!filter_var($username, FILTER_VALIDATE_EMAIL) === false) { 
echo '<b style="color:white;">Email not allowed</b>'; 
exit(); 
} 
if (is_numeric($username[0])) { 
echo '<b style="color:white;">First character must be a letter</b>'; 
exit(); 
} 
if ($uname_check < 1) { 
echo '<strong style="color:white; text-transform:lowercase!important;">' . $username . ' is available </strong> '; 
exit(); 
} else { 
echo '<strong style="color:white; text-transform:lowercase!important;">' . $username . ' is taken </strong>'; 
exit(); 
} 
} 
?>