复选框选中或未选中 boolean php mysql

Question

我正在尝试使用复选框制作此表单，获取值 1 或 0（类似于布尔值），然后在 mysql 上更新它，但我还没有找到方法。也许你能帮忙。我将发布表格和接收它的代码。我确信可能存在循环冲突，但我尝试了所有方法但无法使其正常工作。提前谢谢。

表单

<form action="esconde_cat.php" method="post">
    <table width="300px" align="center" width="140" border="1">
        <tr>
            <td></td>
            <td width="200">Categoria</td>
            <td width="100">Mostrar</td>
        </tr>
        <?php
            include "conecta.php";
            include "verifica.php";

            $sql = "SELECT * FROM categorias ORDER BY ordem";
            $res = mysql_query($sql) or die (mysql_error());
            while ($linha=mysql_fetch_array($res)) {
        ?>
        <tr>
            <td><input name="user[]" type="checkbox" value="true"/></td>
            <td><?=$linha['1']; ?></td>
            <td><?php if ($linha['3'] == TRUE){ echo 'SIM'; } else {echo 'NÃO'; } ?></td>
            </td>
        </tr> 

        <?php 
            }
        ?>
    </table>
    <br/>
    <table align="center">
        <tr>
            <td>
                <input type="submit" name="Delete" type="button" value="Alterar">
            </td>
        </tr>
    </table>
</form>

接收表单并更新 MYSQL 的代码

<?php

include "conecta.php";
include "verifica.php";

\\THIS PART WORKS, GETS IF THE CHECKBOX IS CHECKED AND RECORD IT ON DB

if(isset($_POST['user'])) {
    foreach ($_POST['user'] as $key => $read){
        $read =(@$_POST['user']=='0')? $_POST['user']:'1';
        echo $read;
        $sql = "UPDATE categorias SET mostrar='$read' WHERE ordem='$key'";
        $res = mysql_query($sql) or die ("Erro ao excluir") . mysql.error();
    }
}

\\ON THIS PART OF THE CODE THAT I CANT GET THE VARIABLE TO GET THE
\\VALUE FROM CHEBOXES THAT ARE UNCHECKED RECORDED TO DATABASE

if (!isset($_POST['user'])) {
    foreach ($_POST['user'] as $chave => $leia) {
        $leia =(@$_POST['user']=='1')? $_POST['user']:'0';
        echo $leia;
        $sql = "UPDATE categorias SET mostrar='$leia' WHERE ordem='$chave'";
        $res = mysql_query($sql) or die ("Erro ao excluir") . mysql.error();
    }
}

?>

Answer 1

如果未选中复选框，您将不会在 $_POST 变量中得到任何键。如果选中，则将设置键并且值将是复选框的值。

假设名称“user[]”有效，类似于：

<input type="checkbox" name="user[]" value="aa" />
<input type="checkbox" name="user[]" value="bb" checked="checked" />
<input type="checkbox" name="user[]" value="cc" checked="checked" />
<input type="checkbox" name="user[]" value="dd" />
<input type="checkbox" name="user[]" value="ee" checked="checked" />

您会期望 $_POST 为：

array(
    "user" => array(
        "1" => "bb"
        "2" => "cc"
        "4" => "ee"
    )
);