Question

我一直在尝试在PHP中创建一个登录页面无济于事，我在尝试运行时遇到“此网页有重定向循环”错误，所以我想知道是否有人可能发现我的错误？这是我的代码：

<?php
require_once("nocache.php");
$id = $_POST["id"];
$pword = $_POST["pword"];
if (!empty($_POST){
if (!empty($id) || !empty($pword)){
require_once("dbconn.php");
 $sql = "select username, school_type from school_info where username = '$id' and password = '$pword'";
 $rs = mysql_query($sql, $dbConn);
 if (mysql_num_rows($rs)> 0 ) {
     session_start();
     $_SESSION["who"] = $id;
     $_SESSION["school_type"] = mysql_result($rs,0,"school_type");
     header("location: EOI_home.php");
    }
}
else {
header("location: login.php");}     
} else {
   header("location: login.php");}

?>

<form method="POST" action="<?php echo $_SERVER["PHP_SELF"];?>" id="login">

ID: <input type="text" name="id" /><br/>
pword: <input type="password" name="pword" /><br/>

<input type="submit" value="log in" />&nbsp;
<input type="reset" />

</form>

Answer 1

所有给出的答案在技术上都是正确的，您设置逻辑的方式不正确...请参考以下示例并将其移植到您自己的代码中。

<?php

$id = $_POST["id"];
$pword = $_POST["pword"];

if(!empty($_POST)) {
    // The form was submitted, perform validation here.

    if(!empty($id) || !empty($pword)) {
        // Form validation passed, insert into database
    } else {
        // Form validation failed, display an error or redirect back
    }
} else {
    // Form was not submitted, so display the form.
}

?>

修改我希望不要为你做这项工作（因为你学习的最好），但也许看到上面的代码，以及下面的代码，你可以从中学习吗？

<?php require_once("nocache.php"); $id = $_POST["id"]; $pword = $_POST["pword"]; if(!empty($_POST)) { if(!empty($id) || !empty($pword)) { require_once("dbconn.php"); $sql = "select username, school_type from school_info where username = '$id' and password = '$pword'"; $rs = mysql_query($sql, $dbConn); if(mysql_num_rows($rs) > 0) { session_start(); $_SESSION["who"] = $id; $_SESSION["school_type"] = mysql_result($rs, 0, "school_type"); header("location: EOI_home.php"); } } else { header("location: login.php"); } } ?> <form method="POST" action="<?php echo $_SERVER["PHP_SELF"];?>" id="login"> ID: <input type="text" name="id" /><br/> pword: <input type="password" name="pword" /><br/> <input type="submit" value="log in" />  <input type="reset" /> </form>

Answer 2

循环在这里：

$id = $_POST["id"];
$pword = $_POST["pword"];
if (empty($id) || empty($pword)){
    header("location: login.php"); }

如果未设置$_POST值，则会发生重定向。由于您没有在重定向之前设置值，因此会再次发生。然后再次。再次......

要解决此问题，请在未设置$_POST值的情况下显示表单。

PHP网页有直接循环错误？

2 个答案: