What is the idea of ​​deleting codes in batches in php

php batch deletion code ideas: 1. Set the class file for database query; 2. Add selection check boxes to the table; 3. Use js to control the selection and deselection of all check boxes; 4. Add a form form and submit button outside the form, and use js to control the detailed prompt information when clicking delete; 5. Create a new php file for deletion processing.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

php What is the idea of ​​deleting codes in batches?

php batch deletion can delete multiple or all data at the same time

Create a new php file to display the content in the database:

<table width="100%" border="1" cellpadding="0" cellspacing="0">
    <tr>
        <td><input type="checkbox" id="qx" onclick="xuanzhong()" />全选</td>
        <td>代号</td>
        <td>名称</td>
    </tr>
     
    <?php
    include("DBDA.class.php");
    $db = new DBDA();
     
    $sql = "select areacode，areaname from nation";
    $attr = $db->Query($sql);
     
    foreach($attr as $v)
    {
        echo "<tr>
        <td><input type=&#39;checkbox&#39; name=&#39;ck[]&#39; class=&#39;ck&#39; value=&#39;{$v[0]}&#39; /></td>
        <td>{$v[0]}</td>
        <td>{$v[1]}</td>
    </tr>";
    }
     
    ?>
     
</table>

DBDA.class.php file is the class file for database query:

<?php
class DBDA
{
    public $host="localhost";
    public $uid = "root";
    public $pwd = "";
    public $dbname = "12345";
     
    //成员方法
    public function Query($sql,$type=1)
    {
        $db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
        $r = $db->query($sql);
         
        if($type==1)
        {
            return $r->fetch_all();
        }
        else
        {
            return $r;
        }
    }
}

Add a selection check box to the table:

<td><input type="checkbox" id="qx" onclick="xuanzhong()" />全选</td>

<td><input type=&#39;checkbox&#39; name=&#39;ck[]&#39; class=&#39;ck&#39; value=&#39;{$v[0]}&#39; /></td>

Display:

Use js to control the selection and deselection of all check boxes:

<script type="text/javascript">
    function xuanzhong()
    {
        //取全选按钮的选中状态
        var zt = document.getElementById("qx").checked;
         
        //让下面所有的checkbox选中状态改变
        var ck = document.getElementsByClassName("ck");
         
        for(var i=0;i<ck.length;i++)
        {
            if(zt)
            {
                ck[i].setAttribute("checked","checked");
            }
            else
            {
                ck[i].removeAttribute("checked");
            }
        }
    }
</script>

Add form form and submit button outside the form, and Use js control to display detailed prompt information when you click delete. Complete php code:

        <td><input type="checkbox" id="qx" onclick="xuanzhong()" />全选</td>
        Query($sql);
     
    foreach($attr as $v)
    {
        echo "
        <td><input type=&#39;checkbox&#39; name=&#39;ck[]&#39; class=&#39;ck&#39; value=&#39;{$v[0]}&#39; /></td>
        ";
    }
     
    ?>
    

    
代号
        
名称
    
     
    
{$v[0]}
        
{$v[1]}
    

Finally create a new php file for deletion processing;

<?php
$ck = $_POST["ck"];
include("DBDA.class.php");
$db = new DBDA();
//第一种方式
/*foreach($ck as $v)
{
    $sql = "delete from nation where code=&#39;{$v}&#39;";
    $db->Query($sql,0);
}*/
//第二种方式
//in (&#39;&#39;,&#39;&#39;,&#39;&#39;,&#39;&#39;,&#39;&#39;)
$str = implode("&#39;,&#39;",$ck);
$str = "(&#39;{$str}&#39;)";
$sql = "delete from nation where code in {$str}";
$db->Query($sql,0);
header("location:main.php");

Click OK:

Batch deletion successful!

Recommended learning: "PHP Video Tutorial"

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