如何检查电子邮件是否已经注册？

一尘不染

如何检查电子邮件是否已经注册？

mysql

我正在尝试检查是否已使用PDO注册了电子邮件，但是到目前为止，我还没有找到一种很好的方法来进行此操作。到目前为止，这就是我所拥有的。如果有帮助，则连接变量为“
$ con”。另外，我是否需要在同一文档中使用连接变量，还是在包含的文档中使用它？

<link rel="stylesheet" type="text/css" href="css\errors.css">
<?php
require 'header.php';
if (!$_POST['submit']) {
?>
<html>
<a href="register.html">Regsiter here!</a>
<?php
} else {
    require 'connect.php';
    $firstname = ($_POST['firstname']);
    $lastname = ($_POST['lastname']);
    $email = ($_POST['email']);
    $password = ($_POST['password']);
    $passwordconf = ($_POST['passwordconf']);

    $errorfields = "<p class='errormsg'>Please fill out all the fields!</p>";
    if (empty($firstname) || empty($lastname) || empty($email) || empty($password) || empty($passwordconf)) {
        echo "$errorfields";
    }
    $erroremail = "<p class='errormsg'>Email is not in name@domain format!</p>";
    $regex = "/^[a-z0-9]+([_.-][a-z0-9]+)*@([a-z0-9]+([.-][a-z0-9]+)*)+.[a-z]{2,}$/i";
    if (!preg_match($regex, $email)) {
        echo "$erroremail";
    }
    $errorpassword = "<p class='errormsg'>You passwords do not match!</p>";
    if ($password != $passwordconf) {
        echo "$errorpassword";
    }

    //this is where email is checked
}
?>

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2020-05-17

共1个答案

一尘不染

尝试此操作，使用您的连接凭据填写DB_NAME，DB_USER_NAME和DB_USER_PASS，或者如果所有内容都正确地设置为PDO对象，则使用$
con变量：

$con = new PDO( 'mysql:host=localhost;dbname=DB_NAME;charset=UTF-8', 'DB_USER_NAME', 'DB_USER_PASS' );

$query = $con->prepare( "SELECT `email` FROM `tbl_name` WHERE `email` = ?" );
$query->bindValue( 1, $email );
$query->execute();

if( $query->rowCount() > 0 ) { # If rows are found for query
     echo "Email found!";
}
else {
     echo "Email not found!";
}

2020-05-17