Foreach 循环多次插入相同的数据

Question

嵌套的 foreach 循环毁了我的一天。数据被插入多次（根据检查的嵌套菜单的数量插入相同的值）并且嵌套值存储在每一行中，尽管它们不是父行。

我认为问题是由嵌套的 foreach 循环引起的

<?php
if(!empty($_POST['heading']) && !empty($_POST['content']) && !empty($_POST['keytag']) && !empty($_POST['date'])){
        $heading=$_POST['heading'];
        $content=$_POST['content'];
        $keytag=$_POST['keytag'];
        $date=$_POST['date'];
        $query = '';
        $msg = '';

        $data = explode("," ,$_POST["navid"]);
        $subdata = explode("," ,$_POST["subnavid"]);
            foreach ($data AS $key => $menu){
                foreach($subdata AS $k => $submenu){

                    //If Image is browsed 
                    if(!empty($_FILES['file']['name'])){
                        move_uploaded_file($_FILES["file"]["tmp_name"], $target_file);
                        $query = $con->prepare('INSERT into news(heading, cat_id, subcat_id, content, keytag, date, img) VALUES(:heading, :cat_id, :subcat_id, :content, :keytag, :date, :new_img)');
                        $query->bindParam(':new_img',$new_img);
                    }

                    //If Image isnot browsed 

                    if(empty($_FILES['file']['name'])){
                        $query = $con->prepare('INSERT into news(heading, cat_id, subcat_id, content, keytag, date) VALUES(:heading, :cat_id, :subcat_id, :content, :keytag, :date)');
                    }
                    if(empty($submenu)){
                       $submenu = null;
                    }
                    $query->bindParam(':heading', $heading);
                    $query->bindParam(':subcat_id', $submenu);
                    $query->bindParam(':cat_id', $menu);
                    $query->bindParam(':content', $content);
                    $query->bindParam(':keytag', $keytag);
                    $query->bindParam(':date', $date);

                    if($query->execute()){
                        $msg="Successfully Inserted";
                    };
                }
            }
            echo $msg;
        }

} ?>

问题来了

让我简单解释一下。网站有三个菜单：News、Views、Art。其中只有新闻菜单有子菜单。如果新闻的submenu 和Views/Art同时勾选，默认情况下Views/Art 列也会存储submenu 的值，但在实际视图/艺术中没有子菜单，它正在存储新闻子菜单值。

应该是

这是html

<li>
<input type="checkbox" name="menu[]" value="2">News
    <ul>
        <li>
        <input type="checkbox" name="menu[][menusub]" value="2">Politics
        </li>
        <li>
        <input type="checkbox" name="menu[][menusub]" value="3">Social
        </li>
        <li>
        <input type="checkbox" name="menu[][menusub]" value="4">Economy
        </li>
    </ul>
</li>
<li>
<input type="checkbox" name="menu[]" value="12">Views                                 
</li>
<li>
<input type="checkbox" name="menu[]" value="13">ART                               
</li>

数据通过ajax传递如下

    $(document).on('submit', '#form', function(e){
        e.preventDefault();
        var navid = [];
        $("input[name='menu[]']:checked").each(function(){
            navid.push(this.value);
        });
        var subnavid = [];
        $("input[name='menu[][menusub][]']:checked").each(function(){
            subnavid.push(this.value);
        });
        if (navid.length === 0){ //tell you if the array is empty
            alert("Please Select atleast one checkbox");
            return false;
        }
        else {
            var formData = new FormData(this);
            formData.append('navid', navid);
            formData.append('subnavid', subnavid);
            $.ajax({
            type: 'POST',
            url: 'upload.php',
            data: formData,
            contentType: false,
            cache: false,
            processData:false,
            success: function(data){
                alert(data);

                        }
        });
        }
    });

Answer 1

从第一个 foreach 循环中取出 $subdata = explode("," ,$_POST["subnavid"]);，您应该可以开始了。

因为每个父循环都会提取$_POST["subnavid"]，子循环将从数组的第一个成员开始。

$subdata = explode("," ,$_POST["subnavid"]); // This is the change required.
foreach ($data AS $key => $menu){
   foreach($subdata AS $k => $submenu){
   ......
   ......
   }
}

同时更改$key 变量。因为是一样的。所以它可能会与每个循环重叠。