PHP和MySQL表格。 添加空行
[英]PHP & MySQL form. Adding empty row
问题描述
I am having a problem with PHP from that adds data to MYSQL database : 
我在使用PHP时遇到了问题，那就是将数据添加到MYSQL数据库：
<?php require("config/connection.php"); ?>
<?php require("includes/functions.php"); ?>
<?php
$username = $_POST['username'];
$password = $_POST['password'];
$error='';// zmienna do błędów
if(isset($_POST[submit])){
if(trim($_POST[username])=='' || strlen(trim($_POST[username])) < 6 ||strlen(trim($_POST[username])) >12){
$error.="Name must be between 6 ad 12 chars<br />";
}
}if($error==''){ // if no error, do a query
$sql = @mysql_query("INSERT INTO users SET username=\"$username\", password=\"$password\"");
}
else {
echo "<span style=color:red>$error</span>";
}
mysql_close($connection);
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>
</head>
<body>
<h2>Add user</h2>
<form action="add.php" method="post">
<p>Name: <input type="text" name="username" id="username" /></p>
<p>Password: <input type="text" name="password" id="password" /></p>
<p> <input type="submit" value="submit " name="submit" /></p>
</form>
<a href="index.php">Cancel</a>
</body>
</html>
The main problem is when I input username and password here is what I get: 主要问题是，当我在此处输入用户名和密码时，得到的是：
http://i.padsbanger.pl/img/cdf5b5p988ga http://i.padsbanger.pl/img/cdf5b5p988ga
For unknown reason it adds an empty row and after that it adds what I have trully inputed into my form. 出于未知的原因，它添加了一个空行，之后又添加了我确实输入到表单中的内容。 Any help ? 有什么帮助吗？
1 个解决方案
解决方案1
4 已采纳 2011-12-08 20:21:14
You are executing the query twice, once on page load and then again on submit 您执行两次查询，一次在页面加载时，然后再次在提交时
$error='';
if(isset($_POST[submit])){
if(trim($_POST[username])=='' || strlen(trim($_POST[username])) < 6 ||strlen(trim($_POST[username])) >12){
$error.="Name must be between 6 ad 12 chars<br />";
}
}// closes if(isset *** move this until after the next if statement ***
//this is run everytime as its outside the if(isset block
if($error==''){ // errors is initialised as '' so this will run
$sql = @mysql_query("INSERT INTO users SET username=\"$username\", password=\"$password\"");
}
if(isset($_POST[submit])){ should be if(isset($_POST['submit'])){ if(isset($_POST[submit])){ if(isset($_POST['submit'])){应该是if(isset($_POST['submit'])){
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