我正在尝试检查电子邮件是否已使用 PDO 注册，但到目前为止我还没有找到执行此操作的好方法。这是我到目前为止所拥有的。如果有帮助，连接变量是“$con”。另外，我是否需要在同一个文档中使用连接变量，还是它会在包含工作的文档中？
<link rel="stylesheet" type="text/css" href="css\errors.css">
<?php
require 'header.php';
if (!$_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
}
?>
最佳答案
试试这个，用你的连接凭证填写 DB_NAME、DB_USER_NAME 和 DB_USER_PASS，或者如果一切都正确设置为 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!";
}
关于php - 如何检查邮箱是否已经注册？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15287011/