将复选框选中的值保存到数据库PHP

Question

我开发了一个程序，用于将复选框的选中值保存到数据库中。

所选值未正确传递到数据库。代码中没有语法错误。

<?php
$link = mysqli_connect("localhost", "root", "123456", "database");

// Check connection
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}
?>

<form action="#" method="post">
<input type="checkbox" name="check_list[]" value="C/C++"><label>C/C++</label><br/>
<input type="checkbox" name="check_list[]" value="Java"><label>Java</label><br/>
<input type="checkbox" name="check_list[]" value="PHP"><label>PHP</label>  <br/>
<input type="submit" name="submit" value="Submit"/>

</form>

<?php

if(isset($_POST['submit']))
{//to run PHP script on submit
    if(!empty($_POST['check_list']))
        {
            foreach($_POST['check_list'] as $selected)
                {
                    if(isset($_POST['PHP'])) {
                $stmt = $link->prepare('INSERT INTO `checkbox` (`php_value`) VALUES ($selected)');
                        $stmt->bind_param('s', $stmt);
                        $stmt->execute();

                    }



} // if(isset($_POST['submit']))

    mysqli_close($link);
                }
        }


?>

Answer 1

$_POST['PHP']不存在要检查，这就是复选框值不保存到数据库的原因。

<强>更改：

if(isset($_POST['PHP']))

。通过

 if($selected!="") {

更新代码：

<?php
$link = mysqli_connect("localhost", "root", "123456", "database");

// Check connection
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}
?>

<form action="" method="post">
<input type="checkbox" name="check_list[]" value="C/C++"><label>C/C++</label><br/>
<input type="checkbox" name="check_list[]" value="Java"><label>Java</label><br/>
<input type="checkbox" name="check_list[]" value="PHP"><label>PHP</label>  <br/>
<input type="submit" name="submit" value="Submit"/>

</form>

<?php

if(isset($_POST['submit']))
{//to run PHP script on submit
    if(!empty($_POST['check_list'])) {
        foreach($_POST['check_list'] as $selected) {
            if($selected!="") {
                $stmt = $link->prepare('INSERT INTO `checkbox` (`php_value`) VALUES (?)');
                $stmt->bind_param('s', $selected);
                $stmt->execute();
                $stmt->close();
            }
        }

        mysqli_close($link);
    }
}


?>

还添加了适当的缩进以便于阅读。