无法修改 header 信息 - 标头已发送 - PHP MVC：从一个 controller 重定向到另一个 Z5904C103F2C030

Question

我正在尝试学习 MVC 框架并尝试创建一个简单的登录系统，但我收到有关标题的错误。

警告：无法修改 header 信息 - 已发送的标头（输出开始于 /home/jobspeci/public_html/gerome/clisys/pg_view/login.php:1）在 /home/jobspeci/public_main/gerome/clisys/pg_controller/ php 上线 41

一旦用户输入与用户匹配并通过，目标是重定向或加载另一个 controller。 基本上是显示主页。

public function login(){          
    if (isset($_POST['btnLogin'])){
            
    $user = addslashes(strip_tags($_POST['username'])) ;
    $pass = addslashes(strip_tags($_POST['password'])) ;
            
    $data = $this->Main->mainModel_getUserData($user,$pass);

    if ($data['RESULT'] == 'SUCCESS'){
        //LOAD LANDING PAGE
        $location = BASEURL . SYS_DIR. "/registration"; // sample output for testing // page should redirect to this                
        header("$location");
        exit();             
    }else{
        //show error message
        }
            
     }
    }

model class 中的方法

 public function mainModel_getUserData($username, $password){

    $sql = "Select * from `" .DB_CNC."`.`".DB_TABLE . "` where username = '$username' and password = '$password'";
    $result = $this->CN->Q($sql);
    $data = array();
    
    if ($result->num_rows > 0){         
        while ($row = $result->fetch_assoc()){
            
            if ($username == $row[USERNAME] AND $password == $row[PASSWORD]){                   
                $data['RESULT'] = "SUCCESS";
                return $data;                   
            }
        }
    }
    $data['RESULT'] = "";
    return $data; 
 
}

页面预览：

<form name = "login"  method="POST"  class="system-module" path="<?php echo ASSETPATH;?>" dir="<?php echo SYS_DIR?>">

        <div class="container"> 

            <label>Username : </label> 

            <input type="text" placeholder="Username" name="username" required>

            <br>

            <label>Password : </label> 

            <input type="password" placeholder="Password" name="password" required>

            <br>

            <button type="submit" value="Login" name="btnLogin"> Login</button>

            <br>

            <span style="text-align:center">No account yet? <a name="register" href="registration"> create one </a></span> 

        </div> 

</form>   

Answer 1

我正在尝试学习 MVC 框架并尝试创建一个简单的登录系统，但我收到有关标题的错误。

警告：无法修改 header 信息 - 已发送的标头（输出开始于 /home/jobspeci/public_html/gerome/clisys/pg_view/login.php:1）在 /home/jobspeci/public_main/gerome/clisys/pg_controller/ php 上线 41

一旦用户输入与用户匹配并通过，目标是重定向或加载另一个 controller。 基本上是显示主页。

public function login(){          
    if (isset($_POST['btnLogin'])){
            
    $user = addslashes(strip_tags($_POST['username'])) ;
    $pass = addslashes(strip_tags($_POST['password'])) ;
            
    $data = $this->Main->mainModel_getUserData($user,$pass);

    if ($data['RESULT'] == 'SUCCESS'){
        //LOAD LANDING PAGE
        $location = BASEURL . SYS_DIR. "/registration"; // sample output for testing // page should redirect to this                
        header("$location");
        exit();             
    }else{
        //show error message
        }
            
     }
    }

model class 中的方法

 public function mainModel_getUserData($username, $password){

    $sql = "Select * from `" .DB_CNC."`.`".DB_TABLE . "` where username = '$username' and password = '$password'";
    $result = $this->CN->Q($sql);
    $data = array();
    
    if ($result->num_rows > 0){         
        while ($row = $result->fetch_assoc()){
            
            if ($username == $row[USERNAME] AND $password == $row[PASSWORD]){                   
                $data['RESULT'] = "SUCCESS";
                return $data;                   
            }
        }
    }
    $data['RESULT'] = "";
    return $data; 
 
}

页面预览：

<form name = "login"  method="POST"  class="system-module" path="<?php echo ASSETPATH;?>" dir="<?php echo SYS_DIR?>">

        <div class="container"> 

            <label>Username : </label> 

            <input type="text" placeholder="Username" name="username" required>

            <br>

            <label>Password : </label> 

            <input type="password" placeholder="Password" name="password" required>

            <br>

            <button type="submit" value="Login" name="btnLogin"> Login</button>

            <br>

            <span style="text-align:center">No account yet? <a name="register" href="registration"> create one </a></span> 

        </div> 

</form>