Php 禁止在平面文件数据库中使用相同的用户名
我用平面文件数据库为我的申请做了一个注册页面。我想知道是否有可能使用平面文件数据库使注册者不能使用与已注册者相同的名称，如果有，如何实现 以下是我的注册页面：Php 禁止在平面文件数据库中使用相同的用户名,php,file,flat,Php,File,Flat,我用平面文件数据库为我的申请做了一个注册页面。我想知道是否有可能使用平面文件数据库使注册者不能使用与已注册者相同的名称，如果有，如何实现 以下是我的注册页面： <div align="center"> <?PHP if (isset($_POST['submit'])) { $username = $_POST["username"]; $password = $_POST["password"]; $password1 = $_POST["password1"];
<div align="center">
<?PHP
if (isset($_POST['submit']))
{
$username = $_POST["username"];
$password = $_POST["password"];
$password1 = $_POST["password1"];
if(empty($username)) die(print '<script> alert ("Enter Username"); window.location="registration.php"; </script>');
if(empty($password)) die(print '<script> alert ("Enter Password"); window.location="registration.php"; </script>');
if($password != $password1) die(print '<script> alert ("Password doesn\'t match"); window.location="registration.php"; </script>');
require_once('recaptchalib.php'); // reCAPTCHA Library
$privkey = "xxxx-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"; // Private API Key
$verify = recaptcha_check_answer($privkey, $_SERVER['REMOTE_ADDR'], $_POST['recaptcha_challenge_field'], $_POST['recaptcha_response_field']);
if ($verify->is_valid) {
$file = file_get_contents("data.txt");
$string = "$username||$password";
if(!strstr($file, "$string"))
{
$myFile = "data.txt";
$fh = fopen($myFile, 'a') or die("can't open file");
$stringData = "$username||$password\n";
fwrite($fh, $stringData);
print '<script> alert ("Registration Complete"); window.location="/~u1206424/index.php"; </script>';
fclose($fh);
}
else
{
die(print '<script> alert ("Sorry the username: <b>$username</b> is already registered. Please use diferent username"); window.location="registration.php"; </script>');
}
}
else {
die(print '<script> alert ("You did not enter the correct Captcha. Please try again"); window.location="registration.php"; </script>');
}
}
?>
</div>
<!doctype html>
<html>
<head>
<title>Registration</title>
</head>
<body>
<div id="container" style="width:500px; height:500px; border: 2px solid black; margin:auto">
<?php include "header.php"; ?>
<div id="content" style="background-color:#EEEEEE; width:500px; height:400px; float: left">
<br>
<form align="center" method="post" action="registration.php" >
Username:
<input type="text" name="username" />
<br/>
<br/>
Password:
<input type="password" name="password" />
<br/>
<br/>
Confirm:
<input type="password" name="password1" />
<br/>
<br/>
<?php
require_once('recaptchalib.php'); // reCAPTCHA Library
$pubkey = "6Lcx-esSAAAAAIps5xUbcy7ty45P1usxQWheLpXO"; // Public API Key
echo recaptcha_get_html($pubkey); // Display reCAPTCHA
?>
<input type="submit" value="Register" name="submit" />
</form>
</div>
<?php include "footer.php"; ?>
</div>
</body>
</html>
登记
用户名：
密码：
确认：
.htaccessdata.txt<Files data.txt>
order allow,deny
deny from all
</Files>
如果我选择
dasdsadasd | | xcxaaqs\n | | | | | | | | | | | | | | | | | | | | | n\n$emails = file_get_contents("data.txt");
$email = $_POST['email'];
if ( preg_match( "/(?:^|\W){$email}(?:\W|$)/", $emails ) ) {
//die ("Sorry, your Email is already in our database.");
header('Location: exists.php');
}
else {
header('Location: thank_you.php');
}