PHP中有多个复选框过滤器

问题描述

我一直试图弄清楚这一点，但没有得到它的任何地方。我已经阅读了很多在这里和互联网上发布的其他问题，但无法找到解决方案。特别是在使用多个复选框的情况下。

当我尝试解释我面临的问题时，请耐心等待。

在页面上，我有一个人员列表，他们对应的位置，我从数据库中使用php / sql拉。我想要实现的是能够使用复选框根据位置过滤列表。

这是我目前用于复选框的代码。

  < UL> 
< li>< input type =checkboxname =check_list []value =sydney>悉尼< / li> 
< li>< input type =checkboxname =check_list []value =durban>德班< / li> 
< input type =checkboxname =check_list []value =delhi>德里< / li> 
< li>< input type =checkboxname =check_list []value =cairo> Cairo< / li> 
< li>< input type =checkboxname =check_list []value =madrid>马德里< / li> 
< li>< input type =submit>< / li> 
< / ul> 
  

这是我用来检查复选框是否被选中的代码，并相应地修改了SQL查询

  if（empty（$ _POST ['check_list']））{
 
 $ SQLquery ='SELECT *从`人'; 
 $ query = $ conn-> query（$ SQLquery）; 
 $ b} elseif（！empty（$ _ POST ['check_list']））{
 
 foreach（$ _ POST ['check_list'] as $ check）
 
 $ location = $ check; 
 
 $ query = $ conn-> prepare（'SELECT * FROM`people` where'p_location` =：location'）; 
 $ query-> execute（array（'location'=> $ location））; 
 
 
 
 
 
 
 $ b现在这个代码工作正常，只有一个复选框被选中。但是，如果选中多个复选框，则失败。它只是什么都没有显示。
 
 
我知道我可以使用 OR 操作符来修改SQL查询来添加其他位置所以：
 
 $ $ p $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 'OR'p_location` ='Madrid'）
  

然而，我无法弄清楚我可以如何首先检查所有复选框是否被选中，然后创建SQL语句，当选择了多个城市时，将过滤结果。

我也想知道这是实现这样或者没有的最好的方法。我开放的替代方法实现这个范围内的PHP / SQL。

解决方案

未经测试，但应该给你一个想法

答案已修订！

  $标记= str_repeat（'?,'，count（$ _ POST ['check_list']） -  1）。 ？; 
 
 $ query = $ conn-> prepare（'SELECT * FROM`people` where'p_location` IN（'。$ markers。'）'）; 
 $ query-> execute（$ _ POST ['check_list']）; 
  

I have been trying to figure this out for a while, but am not getting anywhere with it. I have read a lot of the other questions posted here and across the internet but am not being able to find a solution. Specially in the case of using multiple checkboxes.

Please bear with me as I try to explain the problem I am facing.

On a page I have a list of People with their corresponding location which i pull from a database using php/sql. What I am trying to achieve is to be able to filter the list according to location using checkboxes.

This is the code I have currently for the checkboxes.

<ul>
    <li><input type="checkbox" name="check_list[]" value="sydney">Sydney</li>
    <li><input type="checkbox" name="check_list[]" value="durban">Durban</li>
    <li><input type="checkbox" name="check_list[]" value="delhi">Delhi</li>
    <li><input type="checkbox" name="check_list[]" value="cairo">Cairo</li>
    <li><input type="checkbox" name="check_list[]" value="madrid">Madrid</li>
    <li><input type="submit"></li>
</ul>

This is the code I am using to check if a checkbox is checked and accordingly modify the SQL query

if (empty ($_POST['check_list'])) {

    $SQLquery = 'SELECT * FROM `people`';
    $query = $conn->query($SQLquery);

} elseif (!empty($_POST['check_list'])) {

    foreach($_POST['check_list'] as $check)

    $location = $check;

    $query = $conn->prepare('SELECT * FROM `people` WHERE `p_location` = :location');
    $query->execute(array('location' => $location));

}

Now this code works fine when only one checkbox is checked. However, when multiple checkboxes are checked this fails. It just shows nothing.

I know i can modify the SQL query using the OR operator to add other locations like so:

$query = $conn->prepare('SELECT * FROM `people` WHERE `p_location` = 'Delhi' OR `p_location` = 'Madrid')

However, I am unable to figure out how I can first check which all checkboxes are checked and then create the SQL statement in a way which will filter the results when there is more than one city selected.

I am also wondering if this is the best way to achieve something like this or not. I am open to alternative ways of achieving this within the scope of php/sql.

解决方案

Untested, but should give you an idea of what you should do.

ANSWER REVISED!

$markers = str_repeat('?, ', count($_POST['check_list']) - 1) . '?';

$query = $conn->prepare('SELECT * FROM `people` WHERE `p_location` IN (' . $markers . ')');
$query->execute($_POST['check_list']);

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