如何根据用户使用 php 选中的所有复选框查询数据库？

Question

An image of the table is here. I need to access all the checkboxes checked by the user and query database based on that. For Example : if user checks honda and nissan in brands , 3-3.5 and 3.5-4 in price and 15-20 and 20-25 in mileage , i need to query the DB and give the results which satisfy all the above conditions. How do i implement this in php? I have used Mysql database and it has 5 columns namely brand, mileage,fuel type , price and modelID(primary key).

<form method = "post">
<h1>BRAND</h1>
<font size="5">
<table cellspacing = "20px">
<tr>
<td>Hyundai<input type = "checkbox" name = "Hyundai"></input></td>
<td>Honda<input type = "checkbox" name = "Honda"></input></td>
<td>Ford<input type = "checkbox" name = "Ford"></input></td>
<td>Nissan<input type = "checkbox" name = "Nissan"></input></td>
<td>Volkswagen<input type = "checkbox" name = "Volkswagen"></input></td>
<td>Chevrolet<input type = "checkbox" name = "Chevrolet"></input></td>
<td>TATA Motors<input type = "checkbox" name = "TATA Motors"></input></td>
</tr>
</table>
</font>

<h1>MILEAGE(kmpl)</h1> 
<font size="5">
<table cellspacing = "20px">
<tr>
<td>15-20<input type = "checkbox"></input></td>
<td>20-25<input type = "checkbox"></input></td>
<td>25-30<input type = "checkbox"></input></td>
<td>30-35<input type = "checkbox"></input></td>
<td>35-40<input type = "checkbox"></input></td>
</tr>
</table>
</font>


<h1>PRICE(in lakhs)</h1>
<font size="5">
<table cellspacing = "20px">
<tr>
<td>2 - 2.5<input type = "checkbox"></input></td>
<td>2.5 - 3<input type = "checkbox"></input></td>
<td>3 - 3.5<input type = "checkbox"></input></td>
<td>3.5 - 4<input type = "checkbox"></input></td>
<td>4 - 4.5<input type = "checkbox"></input></td>
<td>4.5 - 5<input type = "checkbox"></input></td>
<td>5 - 5.5<input type = "checkbox"></input></td>
</tr>
</table>
</font>

<h1>FULE TYPE</h1>
<font size="5">
<table cellspacing = "20px">
<tr>
<td>PETROL<input type = "checkbox"></input></td>
<td>DIESEL<input type = "checkbox"></input></td>
<td>CNG<input type = "checkbox"></input></td>
</tr>
</table>
</font>
<input type = "submit" value = "GET ME RESULTS" ></input>
</form>

Answer 1

The first problem you'll run into is the way your inputs are set up. If you write the checkbox HTML like this, it will be a lot easier to handle on the PHP side.

<td>Hyundai<input type="checkbox" name="brand[]" value="Hyundai"></input></td>
<td>Honda<input type="checkbox" name="brand[]" value="Honda"></input></td>
...etc.

<td>15-20<input type="checkbox" name="mileage[]" value="15-20"></input></td>
<td>20-25<input type="checkbox" name="mileage[]" value="20-25"></input></td>
...etc

This way, in the script that handles the form submission, you can refer to $_POST['brand'] , for example, and get an array of all the selected brands.

An important thing when writing your query will be how to combine the ANDs and ORs. You should group your ORs in parentheses to make sure it functions the way you intend it to. For example:

WHERE (brand='Hyundai' OR brand='Honda') AND (mileage='15-20' OR mileage='20-25')

A cleaner way to do this is to use IN instead of a bunch of ORs

WHERE brand IN ('Hundai', 'Honda') AND mileage IN ('15-20', '20-25')

As for as the PHP code for how to write the interaction with your database, that really is too broad of a topic to answer, but you said you weren't asking for PHP code, so hopefully this will give you a general idea that will get you on your way.