電子メールチェック変数がエラーを返します。定義されていないとエラーが返されます

Question

私はajaxを使用して申し込みフォームを検証しています。誰かが私にエラーが表示されている理由を答えることができます：未定義の変数：emailcheck。それはその前の行で明確に定義されています。ありがとうございました。以下にコードを示します。あなたが何か行うことができます

<?php 
session_start(); 
include '../dbh.php'; 




if (isset($_POST['submit'])) { 

    $first = $_POST['first']; 
    $last = $_POST['last']; 
    $email = $_POST['email']; 
    $pwd = $_POST['pwd']; 

    $errorEmpty = false; 
    $errorEmail = false; 



if (empty($first) || empty($last) || empty($email) || empty($pwd)) { 
    echo "<span class='signup-error'>Please fill out all fields!</span>"; 
    $errorEmpty = true; 
    } 

elseif (!filter_var($email, FILTER_VALIDATE_EMAIL)) { 
    echo "<span class='signup-error'>Please enter a valid email address!</span>"; 
    $errorEmail = true; 
    } 


else { 
    $sql = "SELECT email FROM user WHERE email='$email'"; 
    $result = mysqli_query($conn, $sql); 
    $emailcheck = mysqli_num_rows($result); 
} 


if ($emailcheck > 0) { 
    echo "<span class='signup-error'>That email address already exists!</span>"; 
    $errorEmail = true; 
    } 



else { 
    $encryptpwd = password_hash($pwd, PASSWORD_DEFAULT); 
    $sql = "INSERT INTO user (first, last, email, pwd) 
    VALUES ('$first', '$last', '$email', '$encryptpwd')"; 
    $result = mysqli_query($conn, $sql); 

    } 

} 


?> 


<script> 
$("#signup-first, #signup-last, #signup-email, #signup-pwd").removeClass("input-error"); 

    var errorEmpty = "<?php echo $errorEmpty; ?>"; 
    var errorEmail = "<?php echo $errorEmail; ?>"; 

if (errorEmpty == true) { 
    $("#signup-first, #signup-last, #signup-email, #signup-pwd").addClass("input-error"); 
} 

if (errorEmail == true) { 
    $("#signup-email").addClass("input-error"); 
} 

if (errorEmpty == false && errorEmail == false) { 
    $("#signup-first, #signup-last, #signup-email, #signup-pwd").val(""); 
} 

</script> 

Answer 1

：

if (isset($_POST['submit'])) { 

    $first = $_POST['first']; 
    $last = $_POST['last']; 
    $email = $_POST['email']; 
    $pwd = $_POST['pwd']; 

    $errorEmpty = false; 
    $errorEmail = false; 



if (empty($first) || empty($last) || empty($email) || empty($pwd)) { 
    echo "<span class='signup-error'>Please fill out all fields!</span>"; 
    $errorEmpty = true; 
} 

elseif (!filter_var($email, FILTER_VALIDATE_EMAIL)) { 
    echo "<span class='signup-error'>Please enter a valid email address!</span>"; 
    $errorEmail = true; 
} 


else { 
    $sql = "SELECT email FROM user WHERE email='$email'"; 
    $result = mysqli_query($conn, $sql); 
    $emailcheck = mysqli_num_rows($result); 

    if ($emailcheck > 0) { 
    echo "<span class='signup-error'>That email address already exists!</span>"; 
    $errorEmail = true; 
    } 



else { 
    $encryptpwd = password_hash($pwd, PASSWORD_DEFAULT); 
    $sql = "INSERT INTO user (first, last, email, pwd) 
    VALUES ('$first', '$last', '$email', '$encryptpwd')"; 
    $result = mysqli_query($conn, $sql); 

    } 

} 

}